Beyond any doubt, the Rheem tankless water heater is the wisest investment that delivers hot water on demand with an ultimate warranty for 20+ years. Though Rheem boasts 96% efficiency on its models, it still needs far less in the way of maintenance. Otherwise, it’s obvious for the users to encounter several Rheem tankless water heater error codes while in operation.
Basically, unlike other smart brands, the Rheem tankless water heater has a built-in electronic diagnostic system that is designed to display an error code when the system finds any problem.
And that’s the point you may get in trouble like me, as there are a large number of Rheem error codes with different meanings.
Don’t panic! For your convenience, I’ve come back here for you!
Based on my personal experience, I’ve compiled the ultimate list below, featuring Rheem tankless water heater error codes, highlighting potential diagnostic issues and their effective solutions. So, let’s dive right in.
Table of Contents
Rheem Tankless Water Heater Codes [Easy Solutions]
Before getting into details, let’s highlight some of the most common Rheem tankless water heater codes that users often face with the exact indication and instant solutions:
| Rheem Error Codes | Error Indication | Recommended Fix |
| No error code | Water is flowing through the unit, but there is no hot water. | Increase water flow rateEnsure hot and cold water lines are not crossedClean water inlet filterCheck & replace the bad water flow sensor. |
| Error Code 11 | Ignition failure | Ensure the use of the right gas type, gas pressure, and gas volume to the unity.Check the gas control valve for open or short circuitsEnsure the igniter rod and flame rod are operationalIf needed, replace the bad control board. |
| Error Code 12 | Flame Failure | Clean blockage in the heat exchanger and blower motor Verify wiring harness is connected to OHLInspect Overheat Wrap and if needed replace it. |
| Error Code 13 | Improper combustion | Remove any blockages from the venting. Ensure intake and exhaust venting meet all installation requirementsVerify the altitude setting, and if needed adjust it check Flame Rod FL-2 4 & Blower Motor |
| Error Code 14 | Over Heat Limiter fault (Mid-efficiency model) Flue Temperature Too High (High-efficiency condensing model) | Clean air inlet screen and heat exchanger fins for any blockages. Inspect the neutralizer and clean it. Clear neutralizer drainage line outside of the unit Also, check the neutralizer water level electrode |
| Error Code 29 | Clogged Neutralizer (High-efficiency condensing model) Heat Exchanger Temperature Is Too Low (Mid-efficiency model) | Check Remote Control wiring for loose or damaged connections. Bypass the remote control. If needed, replace the bad remote control or PCB. |
| Error Code 61 | Blower motor failure | Check the wiring harness to the motor for damaged and/or loose connections. Ensure the blower motor will turn freely. Check venting length not to exceed max lengths and bend. |
| Error Code 76 | Communication fault | Increase the water flow rate from the water shut-off valves. Clean the water inlet filter and clean it properly.Replace the bad water flow sensor. Clean the blockages in the faucet aerators. |
| Error Code 99 | Blower motor is failing to vent | Clean the blockages from the venting lines Clean the blocked heat exchanger as well. Replace the bad blower motor. |
| Error Code E5 | High water pressure | Adjust the water pressure |
| Error Code P1 | Water flow is too low | Increase the water flow rate from the water shut-off valves. Clean the water inlet filter and clean it properly. Replace the bad water flow sensor. Clean the blockages in the faucet aerators. |
| Error Code 1L | Limescale build-up in the heat exchanger | Descale and flush your Rheem tankless water heater. |
No Error Code
If there is no error code on the Rheem control display, it means that the water is correctly flowing through the heater, but there is no hot water. You will get the temperature setting displayed on the screen.
There may be several reasons why water would flow through the system, but water is not heated. Such as:
- The unit isn’t plugged in
- Low water flow
- Plumbing crossover
- Blocked water inlet filter or malfunctioning water flow sensor
How To Fix:
Start by inspecting the power supply to your water heater. Make sure the unit is plugged in correctly. Check for a tripped or turned-off circuit breaker and reset it.
Now verify the minimum water flow rate of the system is met according to the manufacturer’s instructions. If not, check for blockages in the water inlet filter and clean it.
Also, ensure the water flow sensor is in correct working order and there are no crossed water lines in your home plumbing system.
Error Code P1
Rheem tankless water heater error code P1 indicates low water flow in the system. Unlike other tankless water heaters, the Rheem water heater requires a minimum flow rate of up to 0.4 GPM for the main burner ignition.
In case the system detects a low water rate going through the unit, it triggers the error code P1 on the control display. While dealing with the same error code in my Rheem model, I’ve found that my tankless water heater keeps turning off.
Anyway, the major reasons for a sudden reduction in the water flow in a tankless unit include:
- Plumbing crossover
- Blocked water inlet filter
- Bad water flow sensor
- Setting the temperature too high
- Clogged faucet aerators or blockage in the water supply line
How To Fix:
Start by resetting your Rheem tankless water heater. For instance, turn off the power supply to your water heater. Also, turn off all hot water fixtures running for your water heater.
Let the unit reset for up to 10-20 seconds, and then turn the water and power supply back on. Hope that the error code is erased.
If not, inspect the water inlet filter for stubborn grime and particles. Clean it properly.
Verify the water flow sensor condition and replace it if needed. The issue might also be related to cross-water lines in your plumbing system. Head to our detailed Rheem error code P1 troubleshooting guide to deal with this issue.
Error Code 1L
Rheem tankless water heater error code 1L reflects a possible scale build-up in the heat exchanger. As I am living in a hard water heater, it’s quite a common factor for me to build up mineral deposits in the heater elements.
In this case, I always need to be highly concerned about the proper maintenance of my water heater.
Also, you need to be regular in draining and flushing your water heater to remove the mineral deposits and to turn the heater at peak efficiency at all times.
How To Fix:
As mentioned above, you’ll have to drain and flush your water heater to diminish the error code from the remote display and to get the system back into normal operation.
Head to our effective guide on how to flush your Rheem tankless water heater to learn the detailed procedures.
Error Code 03
Rheem tankless water heater error code 03 signifies some malfunctions with the manifold control. It mainly occurs on units with MIC-180 or EZLink.
How To Fix:
First up, unplug the water heater from the power connection. Unscrew the front cover and locate the dip switch setting on the control board. Make sure the Dip switch 4 is in the ON position.
Besides, verify the MIC-180 and the EZLink links are installed correctly. Replace the communications cables if necessary.
Error Code 05
Rheem tankless water heater error code 5 is a diagnostic alarm about the problem in the combustion process of the system. The best chances are the air intake or exhaust vents are partially blocked.
In case of imperfect combustion of your tankless system, a clogged air inlet filter is one of the big culprits to blame.
How To Fix:
Start by inspecting the air inlet filter for blockages. Remove the stuck grime and particles from the filter screen.
Now inspect the air intake or exhaust vents and clean them properly to ensure fluent airflow in the unit. Use a vacuum cleaner to suck out the stuck debris from the vents.
Error Code 10
Rheem tankless water heater error code 10 is found when there is a significant decrease in the ventilation of the system. For instance, clogged blower motor is one of the root culprits of this issue.
Besides this, blockage in the air intake and exhaust venting can also be responsible for restricting fresh air entering the unit.
How To Fix:
To troubleshoot the Rheem error code 10, inspect the blower motor to see whether it is in good working condition. Clean it first and then verify the wiring harness to the motor for damaged and/or loose connections. If needed, inspect the Molex connector of the motor connected to the PCB.
Overall, you‘ll need to ensure that the motor is turning freely. Next, clean any blockage in the exhaust vent and air intake.
Error Code 11
If your Rheem tankless water heater beeps 11, be sure it is the error indication that the unit is running through without ignition. This can happen due to several factors. Like:
- Insufficient gas supply
- Dirty or defective ignition coil
- Clogged flame rods or main burner
- Blocked or incorrect vent installation
- Or faulty PCB
How To fix:
As there is no ignition, you need to find out any issues with the gas supply to the system. Make sure you are using the right type of fuel for your unit. The gas should run thoroughly, or if needed, refill the propane tank. Also, remove any obstruction from the gas supply lines.
Next, head to the vents and clean them properly. Plus, ensure the venting is installed according to the manufacturer’s instructions. Then, look for a spark in the ignition coil.
Verify a good ground connection of the igniter or replace it if necessary. Besides all these, you need to check the flame rod, main burner, gas control valve, or PCB in sequence, as any of them can be responsible for this error code.
Don’t panic! We have a complete guide for you on Rheem tankless water heater error code 11. Check it out right now!
Error Code 12
Rheem tankless water heater code 12 on the remote display is indicating flame failure in the system. Several factors are contributing to this factor when there is no flame in the tankless unit.
Have a look at all of them with the corrective solutions:
| Dirty flame sensor rod | Clean the sensor or replace it if necessary. |
| Gas supply interruption | Ensure the use of the correct gas type, gas pressure, and gas volume for your water heater. |
| Clogged exhaust venting | Remove all the blockage from the exhaust venting. |
| Bad gas control valve | Replace the bad gas control valve |
| Dirty burner chamber and blower motor | Clean them properly |
| Bad wiring harness to the PCB | Fix the bad wiring or replace the defective control board. |
How To Fix
Well! After previewing the above quick table, it will be enough for you to resolve the Rheem error code 12. In case you face any trouble, you can check out our dedicated guide on Rheem tankless error code 12 to get detailed troubleshooting.
Error Code 13
Rheem tankless water heater error code 13 is a clear sign of incomplete combustion in the system. It can happen due to a dirty or broken flame sensor.
Other major reasons include:
- Clogged or incorrect ventilation
- Non-functional blower motor
- Wrong altitude settings
- Poor or no ground connection.
- Interruption in gas supply
How To Fix:
First off, inspect the air intake and exhaust venting, as chances are it is blocked by debris. Clean them properly. Next, remove the front cover and locate the blower motor.
Here, you need to ensure the proper voltage to the blower motor. If necessary, clean the blower assembly.
Next, verify the flame rod as well, whether it is in good working order. Remove the carbon buildup on the sensor rod or, if necessary, replace the damaged one.
Besides, if you install your tankless water heater above 3,280 ft. and fail to set up the DIP switch, it may also trigger the Rheem error code 13. For instance, access to the PCB and adjust the DIP switch for the high altitude setting.
If the error code appears, be sure the unit needs a hard reset. Here is all for you to reset the Rheem tankless water heater error code 13.
Error Code 14
Rheem tankless water heater error code 14 means the overheat limiter has failed, and the water heater has stopped heating due to overheating. In the high-efficiency condensing model, the error code tells you about a tripped high-limit switch to rising temperature.
It can occur due to insufficient airflow or scaled or defective heat exchanger of the unit.
On the other hand, in the event of this fault code on your Rheem mid-efficiency model, interruption in gas supply, faulty Molex connection, and defective control board are also highly responsible.
How To Fix:
First off, ensure you’re using the right type of fuel for your unit. Also, check for blocked or obstructed airflow, faulty or damaged heat exchanger. Remove any deposits, foreign objects, or dust buildup in the combustion chamber and exhausts.
Next, locate the U Molex connector of the PCB to see whether it is installed correctly. If needed, remove it and plug it back in.
Also, you need to measure resistance reading between the Molex connectors. Don’t worry! You can check our comprehensive guide on Rheem error code 14 to do so effectively.
Error Code 15
Rheem tankless water heater error code 15 is an alarming sign of the boiling safety device. The best possibility is the heat exchanger temperature has reached 207 F degrees for more than 15 seconds.
At 210°F, the system will automatically shut down and may turn back on when the temperature goes down to 194°F.
In case the unit reaches 230°F, you will find the error code 15 showing again on the control display.
However, lime or scale build-up on the heat exchanger is one of the root culprits for why the element gets overheated. Otherwise, the thermistor is faulty and fails to regulate the heat exchanger temperature.
If that is not the case, the best chances are the water inlet valve is partially closed or has restrictions in the water inlet pipes.
How To Fix:
When the Rheem error code 15 triggers, you’ll need to descale and flush your Rheem tankless unit following the correct instructions. Next, inspect the heat exchanger thermistor for any damage. Replace it if needed.
Last but not least, make sure the water inlet valve is open, and there is no obstruction in the cold water inlet pipe.
Error Code 16
Rheem tankless water heater code 16 is the error signaling the user about the condition of an overheated system. That means the outlet water temperature Is above the remote thermostat setting.
Various factors can contribute when the temperature of a tankless unit is rising uninterruptedly. There may have been:
- Clogged heat exchanger
- Restrictions in airflow
- Bad gas valve
- Bad heat exchanger thermistor
How To Fix:
First off, inspect the vent terminal and exhaust venting and ensure the airflow is not restricted or blocked. If so, clean out the venting properly. Next, Check the heat exchanger for the mineral deposits or scale build-up. You need to descale and flush out your unit to remove the deposits effectively.
While doing so, don’t miss to check the condition of the heat exchanger thermistor and gas valve.
Measure the hot outlet thermistor resistance readings, and if needed, replace the bad thermistor. But as with the right reading, the defective PCB would be the culprit, which you need to replace as early as possible.
Error Code 24
Rheem tankless water heater error code 24 defines the malfunction of the operational switch.
How To Fix:
To troubleshoot the Rheem error code 24, first up, turn off the power supply to your water heater. Turn off the water supply as well and disconnect the remote control. Now, check if the unit is operating without the remote control.
Next, inspect the grounding connection of the unit and ensure it is in good working condition. If needed, you will have to hard reset your Rheem tankless water heater through the MIN and MAX buttons on the PCB.
Avoid opening the hot water tap whenever you’re dealing with the MIN and MAX buttons.
Anyway, in case of any malfunction in the unit, even after hard resetting the unit, be sure you have a bad PCB. Check out the Rheem customer service for the Rheem control board replacement part.
Error Code 29
Rheem tankless water heater code 29 in the mid-efficiency model is the error indication of the too-low temperature from the heat exchanger. In case you have a high-efficiency condensing model, the error indicates an abnormality with the neutralizer water level electrode.
Either the neutralizer is clogged, or the condensate drain line isn’t correctly routed.
How To Fix:
If the error code 29 is found in your Rheem mid-efficiency water heater, inspect the heat exchanger for any blockage. Clean off any buildups in the heat exchanger fins. Then, measure the resistance readings of the heat exchanger.
If the reading is off, replace the bad heat exchanger. Or, you may need to replace the PCB if the readings are within specs.
Now, in case Rheem’s high-efficiency tankless water heater displays the error code 29, head to the neutralizer for any clogs. If so, remove the shipping cap from the bottom and drain some water through the neutralizer to clean the clog.
As with this, inspect the drain pipe as well for any solid objects. Take a stick and pock the drain line to dislodge the debris. Also, check for unnecessary P traps in the drain line. Finally, ensure that the drainage line is routed correctly.
If you feel trouble while doing all these, you can check out my complete guide on Rheem tankless water heater error code 29, where I’ve highlighted all the easiest solutions based on my personal experience to deal with the error.
Error Code 31
Rheem tankless water heater code 31 tells the user about the problem in the water inlet thermistor. The best chances are the inlet thermistor is clogged up by the scale build-up or damaged at all.
How to Fix:
After turning off the power supply to the water heater, remove the front access panel and locate the inlet thermistor. First off, clean the build-up scale from the thermistor.
Next, measure the resistance reading of the thermistor wiring connection to the control board. For instance, locate the connector R on the PCB and Measure the resistance between the thermistor and connection according to the instructions in the Rheem manual.
If the continuity across all wires is okay, replace the control board. But in case the reading is off, you’ll need to Replace the wiring harness for Connector “R” on the Control Board or replace the thermistor itself.
Error Code 32
Rheem tankless water heater error code 32 defines malfunction in the heat exchanger thermistor. It will occur when the thermistor is blocked by the soot or scale build-up. Besides, bad or damaged wiring connections or defective thermistor can also be responsible for this issue.
How To Fix:
While troubleshooting the Rheem error code 32, check the heat exchanger thermistor according to the maintenance information. If there is no information, inspect the heat exchanger thermistor and take the resistance reading across the wiring connection of the thermistor Molex.
If the reading is not correct, replace the bad thermistor. In case the reading is within the specifications, you may have to replace the PCB.
Error Code 33
Rheem tankless water heater error code 33 signifies a problem with the outlet thermistor. It might be blocked by scale build-up. Or, you may have a damaged or bad wiring connection or a short circuit to the thermistor. Bad PCB can also be responsible for this issue.
How To Fix:
First, verify whether the maintenance information is displaying the hot water outlet temperatures. If yes, the unit is operating correctly. If not, prepare to measure the resistance of the outlet thermistor.
Inspect the Molex connector “R” on the Control Board and check the resistance reading across the wiring connections.
Head to the Rheem manual for better assistance. If the continuity across all wires is okay, be sure the PCB is bad, and you need to replace it. Otherwise, replace the defective outlet thermistor with the help of a professional or contact Rheem customer service.
Error Code 34
Rheem Tankless water heater error code 34 indicates a problem with the ambient combustion air thermistor. This mainly occurs when the thermistor is plugged up by the scale build-up.
Besides this, damaged thermistor wiring, obstructions at the vent terminal, and defective blower fan blades could also result in an error code 34.
How To Fix:
Start by inspecting the ambient thermistor for any scale build-up and clean it properly. Inspect the thermistor wiring for any damage and fix it if you find any loose connections. Even this is the right time when you should check the resistance reading across the thermistor wiring to the PCB.
For instance, inspect the wiring connection of the Molex connector R and take the different Ohm readings. Match those with the instructions in the Rheem manual.
If the resistance to the Ambient Thermistor is OK, be sure the PCB is bad and needs quick replacement. Otherwise, replace the bad wiring harness for Connector “R” on the Control Board.
When done, check for airflow restrictions surrounding the unit.
Clean all the blockage from the air intake or exhaust vents. Then, inspect the blower motor assembly and ensure the fan blade is tightly fitted to the motor shaft. It should spin freely without any restrictions.
Error Code 51
Rheem tankless water heater error code 51 could be found when there is any malfunction with the gas control valve. The best chances are you have a bad wiring harness to the gas control valve, which is why it has stopped working.
How To Fix:
Check the Gas Control Valve wiring harness for loose or damaged terminals. If needed, remove the connection and reinsert it again. Now check for Ohm reading to the wiring terminal of the gas control valve. If needed, replace the bad valve.
Error Code 52
Rheem tankless water heater error code 52 defines you about the problem with the PGFR Valve. Bad wiring harness to the valve is one of the root culprits to blame for this issue.
How To Fix:
Inspect the wiring harness to the PGFR Valve and look for any loose connection. If so, fix it. If necessary, replace the PCB or bad PGRF valve
Error Code 61
Rheem tankless water heater error code 61 signals a problem with the blower motor. That means the fan motor isn’t speedy enough to continue the combustion process in the system.
Either the blower assembly is clogged with dust, or it’s not getting the right voltage from the PC board to let it turn on.
How To Fix:
Without considering anything else, inspect the root culprit blower motor first. Ensure it is turning on freely. If not, chances are the motor bearings are locked up due to accumulated dirt and debris in the fan shaft.
For instance, take a hose-attached vacuum cleaner and clean out the debris between the fan motor and housing. Next, check for loose or damaged wiring connection to the fan motor.
Tighten the loose wiring or replace the damaged one. Next, check the fan motor for proper voltage. Wondering how to do so?
Without thinking twice, head out to the detailed guide on how to test the blower motor of the Rheem tankless water heater. If the reading is off, replace the bad fan motor, or you may need to replace the defective PCB.
Error Code 65
Rheem tankless water heater code 65 is the error information from the controller indicating you about the malfunctioning water control valve. A loose or bad wiring harness to the water control valve could cause this error.
How To Fix:
Whenever the Rheem error code 65 triggers, inspect the wiring harness to the control valve for any loose connections. Reseat the loose wiring. Next, check for proper voltage to the water control valve and replace the valve if you find a malfunction in the element.
Error Code 66
Rheem tankless water heater error code 66 is an alarming sign of the problem with the water bypass valve. A damaged wiring connection to the water bypass valve is the leading culprit for triggering this error code.
How To Fix:
Check for loose or damaged wiring connection to the water bypass valve. Tighten the loose connection or replace the bad wiring harness. Also, Check for proper voltage to water bypass solenoid and replace the bad PCB if necessary.
Besides all that, you need to ensure that the unit receives enough water. For instance, find data about the water flow in the maintenance information.
Error Code 71
Rheem tankless water heater code 71 is the error sign of the malfunctioning gas inlet solenoid valve. The best chances are the gas inlet solenoid valve is not installed correctly if there is a bad wiring harness to the valve.
How To Fix:
Check gas inlet solenoid inlet valve wiring harness for loose or damaged terminals. Fix or replace the bad wiring harness. Plus, check for proper voltage to the valve assembly and replace it if necessary.
Error Code 72
Rheem tankless water heater error code 72 indicates that the flame rods are detecting false flame in the system.
This may happen if the flame rods are obstructed with the soot or dirt build-up.
Also, when a false flame is detected, it could also mean that the burner is not working properly. The higher possibility is that the burner chamber is clogged with foreign materials and dust, leading to this error code.
How To Fix:
First off, inspect the flame sensor rod and ensure it is touching the flame. If not, turn off the unit and check for obstruction in the sensor rods. Take a steel wool and run the sensor to remove the soot build-up.
Next, check for loose or damaged wiring harness or the sensor. For instance, measure the voltage reading for the wiring harness and replace it if necessary. Next, head to the burner chamber for foreign debris or dust. Clean the chamber properly.
Error Code 76
Rheem tankless water heater code 76 is the error indication of the communication fault between the system and the remote controller.
A bad wiring connection between the water heater and the remote controller is the root culprit here. That’s the factor, your Rheem remote controller may not get the right power to operate.
Besides all these, the defective PCB or the bad remote control itself is the major source of this issue.
How To Fix:
Locate the remote Control wiring terminal at the bottom of the unit and remove it from the connection.
Now, try to run the unit without any remote controller. If the unit works, replace the bad wiring.
If not, be sure you have a bad remote control that needs replacement. In many cases, you may need to replace the bad PCB as well. To get detailed, take a look at our comprehensive guide on Rheem tankless water heater error code 76.
Error Code 79
Rheem tankless water heater code 79 is the error indicating a problem with the current of the fan motor. It can occur from condensation or moisture accumulation on the fan motor. Besides, a loose or damaged wiring connection to the fan motor can also be responsible for this error code.
How To Fix:
Inspect the fan motor for any water damage. First up, clean it properly, and it should run freely. Next, head to the Molex wiring connection of the blower motor to the PCB and test the voltage reading. If you find any malfunction, replace the fan or PCB if necessary.
Error Code 80 & 81
Both error codes 80 and 81 on the Rheem tankless water heater mean gas cut-off or extinction failure of the system.
How To Fix:
Inspect the flame rod and gas valve wiring for any defection. Make sure both are installed correctly and working as they should. If needed, test the element through the voltage reading and replace the faulty elements.
Error Code 82
Rheem error code 82 on the remote display indicates that the control board isn’t programmed properly. It can occur if the program chip of the PCB isn’t installed correctly or damaged at all.
How To Fix:
Inspect the program chip on the board to see whether it is installed correctly. Also, check the altitude you are using is suitable for your tankless unit. If needed, restart the unit and adjust the DIP switches on the PCB for the high altitude setting. If still, the error code persists, replace the bad PCB.
Error Code 90
Rheem tankless water heater error code 90 indicates a blocked flue. Blockage in the heat exchanger, blower motor, air intake, or exhaust flue are the root culprits that trigger the Rheem error code 90.
Besides all these, the higher possibility is that the vertical and horizontal vent lengths do not meet the safety standards.
How to Fix:
First off, inspect the heat exchanger flapper for any blockage and clean it properly. Clean the clog from the blower assembly as well and make sure it is in well working order. Next, inspect the air intake and exhaust flue as well and remove the accumulated dust from there.
When all is done, verify that the vertical and horizontal vent lengths meet the standard for safe operation. For intake, you can head to the Rheem customer service for your best guidance.
Error Code 92 & 93
Rheem error codes 92 & 93 are the diagnostic information from the controller, signaling you that the Neutralizer needs to be replaced. Both codes are quite common in the high-efficiency condensing models.
How To Fix:
To diminish the Rheem tankless error codes 92 & 93, you will have to replace the neutralizer with a new and well-working one.
Error Code 99
Rheem tankless water heater error code 99 signals that the fan motor isn’t creating enough ventilation to operate the unit. The possible reasons for triggering this error code include:
- Blocked or obstructed heat exchanger fins
- Clogged air intake filter
- Malfunctioning blower motor
- Or blockages in the venting lines
How To Fix:
Whenever the Rheem triggers the error code 99, it puts the unit in a hard lockout condition. Don’t worry! You can easily reset the hard lockout by following the instructions in your effective guide, Rheem tankless error code 99 troubleshooting guide.
After hard resetting and if the error code still persists, be sure it is time to inspect the exhaust and venting flue for any blockages and clean them properly. Next, check the heat exchanger and air inlet filter as well.
Remove the stuck debris from the elements and ensure they are in good working order. Besides all these, a malfunctioning blower motor is the root suspect for this error. For instance, clean the clog for the motor and then ensure it gets the right PCB voltage. If needed, replace the bad blower motor.
Rheem Error Code E5
Rheem tankless water heater error code E5 signs you that the desired water volume is too high. And due to high water pressure, the unit is failing to reach the set water temperature.
How To Fix:
To trigger the Rheem tankless error code E5, you’ll need to adjust the water pressure to the recommended level. For instance:
- Slightly close the outgoing and incoming water valves.
- Or close the simultaneous running hot water fixtures for your water heater.
- Plus, you can adjust the water pressure from the pressure regulator installed near your water heater.
- As an effective tip, you can install a flow restrictor in your home water lines to reduce the water pressure.
You can even apply a few more tips to adjust the water pressure of your water heater and erase the error code E5. To get details, take a look at our dedicated Rheem error code E5 troubleshooting guide.
FAQs:
Why is my Rheem tankless water heater leaking from the bottom?
Water leaks from the tankless water heater bottom, indicating that the unit may run through high pressure. Other major reasons include hard water build-up, loose water pipe connection, poor ventilation, or malfunctioning of the water pipes due to freezing water.
Why does my Rheem tankless water heater fail to turn on?
Rheem tankless water heater may fail to turn on when there is degradation in the power supply. Another possibility is the unit is in maintenance mode or the remote control is not operating as it should. Interruption in the gas supply can also be responsible for this issue.
How To Set Rheem tankless water to 140 degrees F?
To adjust the temperature to 140, press the Up adjustment button on the remote controller until it displays 120°F. If so, press both UP and DOWN to stop the blink and then set the temperature setting at 140°F.
In Closing
Well! Here is all for you about the Rheem tankless water heater codes. While operating the heater, encountering several error codes is quite obvious. It is even a common phenomenon for those who are not regular in the proper maintenance of their tankless water heater.
Whatever the fact is, you need to know the exact meaning of each error code if you have a Rheem tankless water heater. That’s the point: our comprehensive article is enough to guide you with the right information. After thoroughly reading, hope you will easily track down each of the Rheem tankless error codes by applying proper corrective methods.
Still, if you encounter any more issues with your tankless water heater, you can check our effective Rheem tankless water heater troubleshooting guide to get the easiest solutions.