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

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My unit is a Paloma 7.4 Error code c7 12 with red light on circuit board. The unit has worked great for 2 years and is getting plenty of propane. I burns for 5-10 seconds and goes out. The blinking red light on the circuit board is on whether the unit is running or not.

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  • bmw8187 Aug 06, 2010

    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 off. It is showing error code c7 12 but is getting plenty of propane to the unit. It has run for 3 years. The burners have been cleaned, that ain't it. I think it might not be getting flame confirmation how do I fix that?
    Mitch

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Call rheem customer service at 18004328373 you will need model and serial # before they will help you

You probably need a new control board for your unit..if its still under warranty, Rheem will send you one free.

Posted on Aug 06, 2010

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Http://lib.store.yahoo.net/lib/lowenergysystems/PH-28RCIO-manual.pdf

Usually these problems are caused by the thermostat or the Thermistor that controls the temperature. Either that or the controller has been spiked, a common event,
Often it is the "Protection mechanisms" that go faulty, and stop the unit from working correctly.

Below is a how to troubleshoot another type of unit, however they are all very similar. http://www.seisco.com/pages/trouble-shoot.html
Troubleshooting how to's below
http://www.palomatankless.com/owners/homeowner+trouble.lasso

Posted on Aug 05, 2010

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SOURCE: Error code c7 12

that is a flame failure check flame rod for carbon build up or qualified technician check it

Posted on Aug 12, 2010

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1 Answer

I have a paloma tankles water heater model #ptg-42pvn i am getting an intermitent error code C4,12. what is the problem?


Copy following link for Rheem-Paloma tankless troubleshoot and error codes:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/How-to-install-gas-water-heater.html#install

If unit worked before: Maybe bad PC board. Maybe lack of required yearly maintenance.
Common error codes can be caused by not following maintenance protocol such as cleaning combustion parts, checking gas pressure, checking venting, and air intake, bleeding gas line etc.
Too bad Rheem-Paloma manuals do not show HOW to conduct this maintenance, leaving customer with many unknowns, and no way to oversee that maintenance performed by hired technician is complete, and matches recommended maintenance.
Sell unit on ebay, and install tank-type gas water heater.

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2 Answers

We are getting multiple codes. Can someone help us. Last year we got cod c2 11 which we found out we just have to clean the probes in the unit. So we did that yesterday again and everything worked great,...


Rheem, Richmond, Ruud, and Paloma are all the same manufacturer. After about 9 months, my tankless RTG-74PVN started giving me error code 11 and cold water!. I fixed it by cleaning the burner, as shown in this video:
www.howtolou.com/clean-a-burner

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2 Answers

Getting a 76 flashing on my Paloma PTG-74XP tankless water heater


Error code 76
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf
http://waterheatertimer.org/pdf/Rheem-Tankless-Fault-codes.pdf

Open following link for Rheem/Paloma/Richmond/Ruud tankless troubleshoot resources including error codes, self help, manuals, parts links, tips, and contact information.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Read manual cover to cover, make sure tankless receives yearly maintenance as outline in manual.

Add a comment with your experience so others with same-similar problem can benefit.

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.

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I have a Paloma PTG-74PVN tankless natural gas water heater. It was installed 3 years ago and has worked great until 2 days ago. Currently, the water heater will run for approximately 10 minutes, i.e....


Try turning the thermostat uo a small amount and see if this makes a difference. I suspect the control board is bad but I would try adjusting t-stat before I spent money on board or service call. Thank you

Dec 16, 2010 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

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...

2 Answers

I am having the same problem as posted by jek01 on Aug 1, my Rheem Tankless Hot Water Heater is not powering off, after two years of use with no issues. I also have to turn the breaker off and wait a short...


Remove power source from the unit. If remote control2.gif is installed; remove cover and lift the control wires on the terminal...can be accomplished from either end.

Restore power and see if unit functions normally.

Contact Paloma/Rheem customer (800-432-8373) support and notify them IF you are getting a code "76" error. Rheem has recently extended the warranty on the "Burner Control Assm."; which is your problem. The C4-C8 portion of the error code, is where the unit stops the ignition process...burner fails to light, or gives you intermittent hot water. In either case, contact customer support2.gif.

If this helps, please indicate so.
Mike
jzklipper@aol.com

Oct 11, 2009 | Rheem Tankless Hot Water Heater...

3 Answers

Error code 76 C4 heater shuts off every 5 mins while in shower


Remove power source from the unit. If remote control2.gif is installed; remove cover and lift the control wires on the terminal...can be accomplished from either end.

Restore power and see if unit functions normally.

Contact Paloma/Rheem customer (800-432-8373) support and notify them IF you are getting a code "76" error. Rheem has recently extended the warranty on the "Burner Control Assm."; which is your problem. The C4-C8 portion of the error code, is where the unit stops the ignition process...burner fails to light, or gives you intermittent hot water. In either case, contact customer support2.gif.

If this helps, please indicate so.
Mike//
jzklipper@aol.com

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11 Answers

Paloma tankless, gas, water heater, error code C7 76


If you look on the left hand side of the burner control module you'll see 4 capacitors - the capacitors have most likely failed...pretty sure anything code 76 is P/S failure. It may also be covered for manufactures defects. If the cap is blown..the top will be slightly raised as apposed to flat like the other nearby caps - they are called top blow capacitors...the damage should be evident.

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1 Answer

76 C8 error display on control board


Call Paloma and they will send you a new circuit board. We had the same problem. Our heater is a little over 2 years old. They said the error "76" is a circuit board issue where the tank is not communicating properly with the remote. The other solution they told us was to disconnect the remote and just let the heater run on the default.

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