Question about Rheem Paloma PTG-74PVN / RTG-74PVN Natural Gas Indoor

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Error codes c5 c6 c7

Heater has worked for 3 years without issue. Now the heater fails after 5-10 minutes of use. I reset and it will work for a while, then will fail again.

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  • 117 Answers

It might be over heating, have you flushed the heat exchanger out with anything to clean out the hard water from it? if the unit gets too hot it will shut it down. let me know if you need specs on how to flush it out if you haven't already

Posted on Aug 02, 2009

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C7 error code what is the problem


Copy following link for Rheem/Richmond/ Ecosense tankless computer troubleshoot and error code resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
C7 might mean tankless computer motherboard has gone bad
If tankless is older than 5 years, then cut losses and replace with tank-type heater so there is less maintenance and repair expense, and homeowner or local plumber can make repairs without calling tankless computer technician:
http://waterheatertimer.org/How-to-install-gas-water-heater.html
Gene

Aug 08, 2013 | Water Heaters

1 Answer

Default code C7 76


Hello Howard

1) Copy following link for troubleshoot resources including error codes:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

2) Unknown if this is new install or older unit with new problem
This error code can be failed PC board

3) Feb 2013. Add a comment and say what you find

Feb 01, 2013 | Rheem Water Heaters

2 Answers

We are getting multiple codes. Can someone help us. Last year we got cod c2 11 which we found out we just have to clean the probes in the unit. So we did that yesterday again and everything worked great,...


Rheem, Richmond, Ruud, and Paloma are all the same manufacturer. After about 9 months, my tankless RTG-74PVN started giving me error code 11 and cold water!. I fixed it by cleaning the burner, as shown in this video:
www.howtolou.com/clean-a-burner

Jul 31, 2011 | Rheem EcoSense by 7.4 GPM Tankless Water...

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

Apr 21, 2011 | Rheem Paloma PTG-74PVN / RTG-74PVN...

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 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

Will run for 3 min and shut down error code C5 and 12 or C7 and 12


hi my names pete ill try and help c7 is where the start up sequence has ended c12 is saying gas service has been interupted hope this helps

Nov 18, 2009 | Rheem Tankless Hot Water Heater...

11 Answers

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.

Jul 24, 2009 | Rheem Paloma PTG-74PVN / RTG-74PVN...

7 Answers

Rheem RTG 53 PVN with fault codes C4 or C7


I had the same problem with my tankless waterheater (flashing c4 76 alternately). I called Rheem
tech support and they had me 1 power down the remotepanel 2 unplug the unit from the wall 3 remove the cover 4 remove the wires for the remote panel from the circuit board and pull the twisted pair that goes to the remote out from the bottom of the unit. 5 reinstall the cover 6 plug the unit back
into the wall and turn on the hot water see if it works. It did in my case and they are sending me a new remote panel. I hope it helps.........

Nov 21, 2008 | Rheem RTG-53PVN Indoor Natural Gas...

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