Question about Rheem EcoSense by 4.2 GPM Tankless Water Heater LP Gas

1 Answer

Every 2 to 5 days, the heater will display an error code "C7" and not deliver hot water. When I turn the heater off and back on again, it will work for a couple days just fine. I cleaned the air intake filter because it had lint on it but it continues to error periodically.

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  • bob_noworyta Mar 25, 2011

    You were very helpful and I would use your service again if the need were to arise

  • Anonymous Mar 20, 2014

    Error code C7 13

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  • Rheem Master
  • 43,501 Answers

Hi,
If you are getting the C7 code you should also be getting another code after that..like a 76 or a 79...
If you are not getting anything else then the best possibility is that your control board is bad...

There have been quite a few of these boards going bad and that would be my first guess as to your problem...
Some have been replaced by the factory for free...I would call them and see if you can get a new board from them...
At least call their tech. support first and let them walk you through some tests so that they can verify that the board is bad...they often will send you a new board on the spot then.
I have also found that the customer can often get further with the company then the contractor can..

Please comment back if you have any further questions..

heatman101

Posted on Mar 22, 2011

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1 Answer

C4 76 error code on richland waterheater


Richland tankless is made by Rheem.
C7-76 is communication fault with remote.
Turn off power at remote and wait 5 minutes, turn power back on at remote, and see if problem clears.
If problem continues, read below:

Before calling service technician, open following links for troubleshoot resources including error codes, Rheem chat, typical maintenance manual:
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Tankless water heater, more than any other type of heater, need to be maintained.
Maintaining tankless will probably not affect C7 76 fault code, but can prevent many other common error codes.
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Sep 14, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

No hot water error codes 76, C4,C7


Before calling service tech, open following links for Rheem troubleshoot resources including rheem chat, error codes, possible maintenance and service manual.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error codes are considered start-point for troubleshooting.
Multiple error codes can mean PC board failure.
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf
http://waterheatertimer.org/pdf/Error-code-13.pdf
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Aug 12, 2011 | Rheem RTG-66DVN Direct Vent Natural Gas

1 Answer

Code c7 13 is displayed on control panel. When I reset it it runs for a few minutes then quits again


Open following link for Rheem troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

C7 is communication with remote control, but can also be related to other problems.
For possible C7 quick fix:
http://waterheatertimer.org/pdf/Error-code-C7.pdf

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1 Answer

Rheem tankless propane hot water heater error code C7. Cant get hot water. It keeps shutting off and then once turned back on wont work and gives the C7 code. What does it mean?


Use following link for Rheem tankless troubleshoot: http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

I believe error code C7 is same as error code 76

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Feb 17, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

My tankless is shuting off or flashing C4 and/or C7


Use following link for Rheem tankless troubleshoot: http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

I believe error code C7 is same as error code 76
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Feb 09, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

My hot water heater keeps kicking off and the theramsatic is flashing C7 76. How do I reset it?


Use following link for Rheem tankless troubleshoot:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

I believe error code C7 is same as error code 76

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 31, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

Can't find manual & have a C7 error code on a Rheem tankless water heater model # rtg-74pvm-1.


need to contact rheem what you can do until then is remove the control wire it will run until parts ship out

Jul 26, 2010 | Rheem Tankless Hot Water Heater...

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Paloma tankless, gas, water heater, error code C7 76


If you look on the left hand side of the burner control module you'll see 4 capacitors - the capacitors have most likely failed...pretty sure anything code 76 is P/S failure. It may also be covered for manufactures defects. If the cap is blown..the top will be slightly raised as apposed to flat like the other nearby caps - they are called top blow capacitors...the damage should be evident.

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