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

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Rheem tanless waterheater cuts of with error code c4 then 13.

Enviro plumbing, Irving tx. thought the problem to be the absence of the condensation tee; installed and did not solve problem.

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  • tommy_powers Feb 24, 2009

    Vented straight up,

    Error codes C4 and 13, cuts off. Resets ok,, just a pain.



    Installed about 2001, prior home owner,.

    Had two tank types, removed both, replaced with 1,, propane, Installed in attic. Water volume does not appear to be the problem.



    Will have gas pressure validated.

    Thanks

  • tommy_powers Feb 24, 2009

    These hints have been tried... next is to check propane pressure.

    thanks, anyway

    tp

  • rts1229 Mar 02, 2009

    I have a similar problem. I have had to reset three times in the last week, with error C7 21 yesterday, and now C8 21 today.

    I have a 90 degree coming out of the top for about 18 inches, then straight up for about 4 feet. No problems until this week. Natural Gas, and all other home appliances are working fine. In addition, I have a second unit on other side of house working fine.

  • Scott Magill May 11, 2010

    What is the error code that it gives you? How is it vented up and out or does it go straight up? How installed and when? What kind of water heater did you have before? I would check gas line to make sure it is sized right

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Air intake of the unit and or vent termination may be blocked. If the heater worked for that long without a condensate tee. The heat exchanger could be pluged . I would have heater cleaned and have them check out heat exchanger.If you want to take flue pipe off of the top of water heater you can take a flashlight and look down at heat exchanger to see if it is pluged take front panel off first also turn power off if you decide to do this. If you need any help let me know

Posted on Feb 24, 2009

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