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

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C4 13 error flashing on water heater, shuts off after a minute

Our water heater was shutting off after about a minute of use. I called the Rheem support number and they told me:

1. They wouldn't support me because I used flexible pipe for the gas line -- it had to be black pipe. The fact that the manual said flexible pipe was OK for lengths under 36 inches was irrelevant to them.

2. The error code represented some sort of blockage or gas flow problem. They sent me a 10-page PDF file detailing the steps necessary to take apart the unit, remove the burner, and clean everything.

After spending about four hours disassembling the unit I came across the ODS (Oxygen Depletion Sensor) and found a cocoon of some sort inside. Some critter had crawled up there and made a nest inside the 3/8" pipe, preventing the system from properly detecting oxygen levels and causing it to shut down.

I scraped the cocoon out with a small tool, then ran a ribbon of steel wool through the pipe to clean it thorougly. After reassembly everything worked perfectly, and now we get hot water even faster than ever!

The increased performance me think that the cocoon may have been in there before we even purchased it, but might have shifted or worked loose and finally caused an error.

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  • Matthew Schwartz
    Matthew Schwartz Aug 15, 2015

    Thanks for posting this info. I've got the same error and after diagnosing it, I'm sure it's my ODS. Glad to know it may be something I can fix.

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  • 248 Answers

1/ overheat stat 2/ fan 3/ microswitch 4/diaphrapm valve best of luck

Posted on Oct 24, 2009

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Power vent 2 41vrp50n


Copy following links for troubleshoot by type of gas control valve, error codes and diy resources:
2 flashes might be pressure switch failure:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#pressure

http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

http://www.thetankatwaterheaterrescue.com/forums/forum3/

Rheem does not post service manuals, as consequence almost all water heater questions on fixya are about Rheem products. However other companies use same gas control, and have service manuals available that might assist.

Call for service technician.

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http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

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http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

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Have a Rheem PTG-74PVP tankless water heater. Shuts off after a few minutes while taking a shower. Get a code 76 C8


Before calling service technician, open following links for troubleshoot resources including error codes and rheem chat, and typical scheduled maintenance:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Error 76 can mean communication failure between tankless and remote control, which can include bad remote control, bad wire, bad wiring connector, or PC board failure.
Disconnect remote control and see if tankless will work.
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf

Error C8 76 can mean PC board failure.
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Take a moment and rate answer:
And take advantage of fixya expert assistance live.
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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.

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