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

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76 C8 error display on control board

The unit is about two years old and this is the first time having any trouble getting hot water to stay on heat. I turn it off and reset the temp control to 116 where it has been since installation. Not it shut off within about 4 min. and I have to reset it, do you think its the pc board?

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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.

Posted on Aug 12, 2009

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1 Answer

My Rheem tankless water heater has been flashing a C8 and 76 code. I can turn off the heater using the power button on the unit, but my hot water will only last for a shower or so. Any suggestions? ...


Before calling service technician, open following link for troubleshoot resources including Rheem chat and contact, possible manual, error codes, etc.:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

C8 76 is generally bad PC board. Call 800-432-8373
Just like a motherboard on your computer, the tankless PC board is operational center of tankless water heater.
Various sensors gather information from water pipes, gas line, vent pipe, and air supply to determine when to activate burner.
Most people understand that when their computer motherboard needs replacement, that computer will probably not work reliably again.

Tankless is basically connecting a complex computer to your plumbing and electrical lines and to a gas burner with a vent pipe to outdoors, despite knowing that plumbing lines, vent pipes, gas burners, and household electrical systems have plenty of problems on their own.

Age factor: When tankless is new and everything operates perfectly, the tankless works correctly.
And each tankless manual recommends yearly and monthly maintenance, just to maintain operation, the cost of which can exceed the expected 1-8$ monthly savings. And who wants to clean the water filter each month and delime the exchanger every year?
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Don't buy a tankless water heater because the only folks promising unlimited hot water and effortless water heating experience while saving money with a tankless are the tankless promotors.

Solve most tankless problems yourself, same day, any brand for about $350.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Sep 22, 2011 | Rheem Tankless Water Heater Main Remote...

Tip

Get hot water from your Rheem tankless during a code 76 error


This doesn't always work, but on the Rheem tankless Gas/Propane water heater, if you're experiencing a code 76 error; disconnect the remote control unit (either from the water heater or the remote) by lifting the wires for the remote connection. Typically you'll get a C1-C8 error code, followed by a code 76; if you're getting a straight code 76 and nothing else, this procedure probably won't work.
Code 76 is a total power supply failure on the printed circuit board (PCB) assembly, which is the communication/power supply for the remote control unit. But, if you're getting a supplemental code (C1-C8) this procedure will most likely supply you with hot water until the replacement PCB arrives.

on Dec 01, 2009 | Rheem Tankless water heater for 1-2...

2 Answers

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.
Contact Rheem and/or service technician.

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And 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.

Sep 07, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

Remote is flashing C8 and 76, alternating. I turn the unit off, then back on, and I get hot water for about 10 seconds, then it goes cold and the same error message occurs. Unit is Rheem Main Remote...


Before calling service technician, open following links for Rheem tankless resources including error codes and Rheem chat.
Disconnect wires from remote to see if system stabilizes. Unit will heat to default temperature without remote.

Error codes are considered start-point for troubleshooting.
C8 76 can mean PC board failure.
76 can mean communication failure with remote control
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/ErrorcodeTroubleshooting.pdf
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf

Jul 31, 2011 | Rheem Tankless Water Heater Main Remote...

1 Answer

I also a Paloma tankless water heater that is 2 years old. I am now getting an error code C7 76 also. Is this something I can take care of, or should I call a plumber to address?


Remove power source from the unit. If remote control 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 support .

If this helps, please indicate so.
Mike//jzklipper

Nov 16, 2009 | Rheem Paloma PTG-74PVN / RTG-74PVN...

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

Oct 01, 2009 | Rheem RTG-53PVN Indoor Natural Gas...

1 Answer

Power outage caused c8 / 76 error - No Hot Water


How old is your unit...if less than 5 years old tell Polam/Rheem customer support you are recieving a code 76 error - this is a loss of communication between the remote and the burner control assembly. Part will be covered under MF defect warranty. However, the part is covered....the labor to install is not.
If you are slightly technical you can install the part yourself...customer support will walk you through the process and they give you a step-by-step procedure to follow.

Sep 24, 2009 | Rheem Paloma PTG-74PVN / RTG-74PVN...

2 Answers

Remote is displaying C7 76


Contact Paloma/Rheem customer (800-432-8373) support and notify them 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 support. However, I do have a detailed process on how to repair the printed circuit board yourself. Any further questions, you're welcome to email me at jzklipper@aol.com .

Good Luck, if this has helped you in any way...please indicate so.

Aug 22, 2009 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

Code C8 76


Remove power source from the unit. If remote control 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 support .

If this helps, please indicate so.
Mike//jzklipper

Aug 06, 2009 | Rheem Paloma PTG-74PVN / RTG-74PVN...

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