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C4 76 error code c4 - 76 flashes c4 then 76 tries to run then shuts down

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  • snap101
    snap101 May 11, 2010

    is it a rheem?

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  • 117 Answers

76 is a bad connection between the controller and the unit. try unplugging the controller and running it, also check the wiring between the two units. if that is not it. it means that one of the control boards it shot

Posted on Aug 01, 2009

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Posted on Jan 02, 2017

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My Bosh 24ES has error code 14 what does this mean and can I fix it


The year 2009 Bosch 24ES manual does not show error code 14.
Your manual may be different.
Call Bosch 1-800-642-3111
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Bosch-GWH2400ES.pdf

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C4,76 what is it?


Before calling service technician, open following link for Rheen troubleshooting resources and possible error code help plus link to Rheem chat:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Typically, error codes are start-point for troubleshooting.
Error 76 is communication fault with remote control, which can be bad remote, bad wire, bad wiring connection, or bad part inside tankless.
C4 is oxygen sensor problem or bad venting.
More than 1 error code, or mixed error codes can indicate problem such as bad PC board -or- PCB.

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How to correct error code C-7 on my RTG-74PVN Rheem Pronto


I had the same problem and called the manufacturer. The error code C-8 was followed by the number 76. They told me to disconnect the thermostat/digital display from the main unit. This was fairly simple to do by removing the front panel. The unit works steady now without shutting down after a few minutes. The help desk told me that the main circuit board needs to be replaced for the unit to work with the display and that they would mail me one asap. At least we have hot water again.

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