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Jennifer
Jennifer Posted on Jul 30, 2012
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C7 is code - Bosch AquaStar 2400ES-NG

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Steven Foerst

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  • Posted on Oct 17, 2013
Steven Foerst
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Joined: Apr 04, 2010
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C7 is displayed when the primary fan (the one in the middle just under the copper heat exchanger) does not spin or the computer does not recognize that it is spinning. There is a plug on the back of the fan. Make sure it is plugged in all the way.
This also happens when the computer gets damaged because the unit is plugged in to an extension cord, power surge or poorly adjusted combustion (most contractors lack the proper equipment to adjust the flame on high efficiency equipment). I have been to over 500 tankless water heater installations and found every one of them were not adjusted at all! It can also be a damaged fan caused by an improperly installed exhaust pipe.

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Related Questions:

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1answer

Bosch2500LP tank less HW flashing code C7 no hot water. What to do?
C7 is a fan code, either blown fuse on the board, bad board, or bad fan. Fan needs 24VDC, if you get voltage to your fan and still have C7, the fan needs to be replaced. If no voltage to the fan, its either the fuse or the board.
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Aug 18, 2013 • Bosch & Tankless LP Hot Water Heater
0helpful
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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

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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Feb 01, 2013 • Rheem Water Heaters
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1answer

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
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Sep 14, 2011 • Rheem Tankless Hot Water Heater...
1helpful
1answer

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
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Aug 12, 2011 • Rheem RTG-66DVN Direct Vent Natural Gas
0helpful
1answer

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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Apr 21, 2011 • Rheem Paloma PTG-74PVN / RTG-74PVN...
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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.
Read full answer
Feb 17, 2011 • Rheem Tankless Hot Water Heater...
0helpful
1answer

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.
Read full answer
Feb 09, 2011 • Rheem Tankless Hot Water Heater...
0helpful
1answer

C7 andC8 plus 76 flashing on my remote
C7 C8 76 error code, can be PC board fault, and/or communication fault with remote.

Open link to read one possible solution:
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf

Open following link for Rheem/Paloma/Richmond/Ruud tankless troubleshoot resources including error codes, self help, manuals, parts links, tips, and contact information.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Add a comment with your experience so others with same-similar problem can benefit.

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.
Read full answer
Dec 16, 2010 • Rheem Tankless Water Heater Main Remote...
0helpful
1answer

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
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Jul 26, 2010 • Rheem Tankless Hot Water Heater...
0helpful
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Paloma water heater error c7 13
I have a code showing C7 13 the heater runs for about 2 to 3 mins then shuts off. Any suggestions?
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Apr 24, 2010 • Rheem Paloma PTG-74PVN / RTG-74PVN...
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