Question about Rheem Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm

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I am getting error code C7 76 on model RTGG 53DVN

The unit will run for about 15 seconds and then shutdown with htis error code.

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I had the same problem. I ordered a replacement remote unit 117 but it malfuctioned also. When orginally installing the unit I had used 16 gauge stranded wire. It was heavier and I thought there would not be a problem well when I decided to try 18/2 solid thermstat wire everything cleared up. Apparently, after two years of use the electrical characteristic of the stranded wire had gone out of the limits for the two units to communicate.
Check to be sure that the wire is 18 gauge solid copper that connect the units.

Posted on Aug 18, 2009

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Is a connection between your controller and the unit disconnect the controller and see if it runs if not then it could be the PCB board. check your wires for bad connections on the remote as well

Posted on Aug 02, 2009

  • jwilkie59 Dec 18, 2010

    I tightened the connection to the thermostat, both in the unit and at the thermostat and the C7 76 error code no longer comes up. Thanks!

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http://waterheatertimer.org/pdf/ErrorcodeTroubleshooting.pdf
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