Question about Rheem RTG-74PVN-2 Natural Gas Pronto Whole House, Natural Gas, Tankless Wat

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

Hot water heater kicks off when using hot water. Monitor shows C-7 code.
I cleaned both water filter and air intake filters. What else can I do to fix this problem?

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  • pculotta3 Jan 12, 2009

    My unit has worked great for about 1 1/2 years. Starting about a week ago, the unit would should off after using it for 15 minutes or so. Sometimes I would see error code C4 or maybe C8. Now, it will stay on for about 30 seconds and show error code C7.

  • vinnyboy88 Feb 26, 2009

    I have the same problem either C7 or C8 error code. And no, the manual has no information for these codes.

  • Scott Magill May 11, 2010

    There should be another number after the c-7. Have you cleaned the inside of heat exchanger? You could have a build up of lime inside? If you have your manual i think page 36 tells you error codes. you can call rheem customer service at 18004328373 you will need model and serial # before they will help you but they will help you trouble shoot problem if you have all the information.This will probaly be quicker for you to get it fixed? if not let me know and i will try to help you out.

  • Anonymous Mar 20, 2014

    The hot water runs 3-5 minutes then it kicks off with error codes c7-c8. I cannot find what these 2 codes indicate

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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.

Oakville, Ontario

Posted on May 24, 2009

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You are missing another portion of the error code. Example: the remote flashes C-7, then flashes 13. The manufacture can assist you. Call them at 800-432-8373. Have your serial & model number.

Posted on Mar 10, 2009

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