Question about Rheem Paloma PTG-74PVN / RTG-74PVN Natural Gas Indoor

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Keep shutting off little to no hot water 11/2 yrs of the 2yrs

The hot water heater shuts off with codes of c7 or c2 had a ac/heating man look at it and he said it was the coils are not dirty as the paloma service center on the phone suggested. i need help im about to buy a regular tank and call the better business beaura on them this is bull shi_ i need some one that can work on them live in maryland please help im reduce to heating water and filling up my tub

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The Rheem Paloma is a very good system. I live in North Carolina so I cannot come and work on it however if you contact Rheem they should have a list a qualified service personnel in your area. Another suggestion is to find the local Rheem distributer ie: Ferguson Enterprises....Longley Supply.... any plumbing distributer and see who they can recommend thay are usually very good about referrals

Posted on Jul 31, 2009

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Rheem Integrity 20 not always lighting. Showing code C2 11

Before calling service technician, open following links for Rheem/Paloma troubleshoot resources including error codes:

C2 11 is no ignition.
Clean combustion parts yearly as recommended in manual is first step.
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Oct 06, 2011 | Rheem Tankless Hot Water Heater...

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I have a Model PH-28ROFN. The control pad reads 120 as it always has. When I turn on the faucet the code C2 11 flashs in sequence. No hot water is available. Any ideas please. Jerry Averill

Before calling service technician, Open following link for troubleshoot resources:

C2 11 is no ignition.
Do-it-yourself solution can include: clean burner parts and combustion chamber, clean air intake, realign igniter and sand carbon off igniter.
Other causes can be combination of factors.
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The product manual recommends yearly service.
Yearly service should include checking/testing each item mentioned above, plus checking that temperature is not set too high for volume of water used, checking for water softener, plus checking if acidic vent condensate is correctly flowing into household drain and eventually out to sea instead of dripping into heat exchanger causing expensive alloy to rust, crack and fail.
Other periodic maintenance includes de-liming the heat exchanger yearly, and cleaning water filter monthly.

Repair most tankless problems yourself, same day, all brands for $350.

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1 Answer

Rheem-Tankless-water-heater I am showing a C2 then 11 flashing on my thermostate. what is wrong.

Before calling service technician, open following links for common error codes, Rheem chat, and possible manual.

Error codes are start point for troubleshoot.
C2 11 is 'no ignition' or 'gas shut off vale is not open'
Gas shut off valve handle must sit parallel with gas line.
This kind of error code can be air in gas line, improper grounding at electrical outlet, bad igniter, shorted solenoid, loose connections, etc.
Most tankless manuals recommend yearly service, and that type of work usually covers cause for most common error codes: for example checking gas pressure, gas line, air in gas line, clean and check burner and combustion parts and igniter, inspect that vent condensate is properly draining and vent has good draft, clean water filter, clean air intake, check for loose wires, delime heat exchanger, test outlet with circuit analyzer etc.

Aug 11, 2011 | Water Heaters

1 Answer


Open following link for handy Rheem troubleshooting resources:

Add a comment with your experience to help others fix similar problem.

Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Mar 25, 2011 | Rheem Tankless Hot Water Heater...

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Use following link for Rheem tankless troubleshoot:

I believe error code C7 is same as error code 76

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
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Fixya is always less expensive than a service call.

Feb 17, 2011 | Rheem Tankless Hot Water Heater...

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Paloma (Rheem) tankless water heater 7.4 gpm 199,000 btu outdoor unit. Red light is blinking on pc board. unit fires up for approx 2 seconds then shuts off, then cycles once more for 2 seconds and shuts...

i think your flame sensor is bad but you will need to confirm that with rheem i am unsure what the c7 is for but code 12 is flame failure and there could be carbon build up on the flame rod...

Aug 06, 2010 | Rheem Tankless Hot Water Heater...

1 Answer

Will run for 3 min and shut down error code C5 and 12 or C7 and 12

hi my names pete ill try and help c7 is where the start up sequence has ended c12 is saying gas service has been interupted hope this helps

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Paloma tank less water heater flashes code C4 13 and we have no hot water?how to fix it?

I had the same problem with my Paloma a year and a half after installation...contacted Rheem customer service (800-432-8373) and they recommened a local installer in my area. The technican diagnosed the problem as the "flow control valve"; he managed to get Rheem/Paloma to cover the part under warranty...I only had to shell out the money for the install.

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