20 Most Recent Rheem Paloma Tankless Water Heaters PTG-74PVN Tankless RTG-74PVN Questions & Answers

bad pc board? inadequate maintenance? bad oxygen sensor? inadequate air supply? bad venting? http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#error Gene If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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

C7 13 might be bad flow control valve.
While the tankless is down, I suggest also catching up on general maintenance such as cleaning the combustion chamber and burner parts, checking vent drain line, and cleaning water filter, and de-liming the heat exchanger.
Some resources are shown following pdf:
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Check L1 error code on following site:
http://www.palomatankless.com/owners/homeowner+trouble.lasso

1l or IL is Delime tankless yearly: http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#de-lime Gene If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

There is a piece of clear plastic film wraped around the heat exchanger. Conductive material (black) is coated on that film. In case of overheating, the film melts, break the circuit and the heater stops. That's how it works, in theory. I had the same problem and had to remove the heat exchanger to inspect the film on the back side. It's a pain in the @#$%, especially found no problem with the film itself. This is what you should do: Find and disconnect connector U in the center of the board with 2 tiny white wires. Measure resistance between those 2 wires, should be 50K~100K. If it's open, either the film is damaged or, in my case, the connector on the film is bad (on the right side of the heat exchanger). Since no other tankless maker uses this protection scheme, I don't think it's doing much. My solution is to fool the controller with a 100K ohm resistor across the 2 white wires. If you're not comfortable with my micky mouse solution, replace the film.

Best place to start troubleshoot is the manual.
For example manuals and key Rheem, Richmond, Paloma, Ruud troubleshooting links:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

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Call rheem for the how to on clean and testing the oxygen depletion sensor and check the venting

Bad remote control or bad PC board http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#76 Gene If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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.

No error code. Incoming water is very cold. Before calling service technician: Catch up on maintenance. Clean water filter. Delime heat exchanger. Check for crossover Check water flow is high enough Set temperature lower. Install tempering tank. http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#no-error http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#temperature Gene If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html Bad remote control, bad pc board, bad wire between pc board and remote control Gene If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Even though you are not getting an error code, there are may be some diagnostics in the controller that can identify whether it's an electronic (controller/sensor) or a heat exchanger issue. I would contact Rheem tier-2 support.

Imperfect CombustionClean air inlet filter.Clean combustion air fan.Clean heat exchanger fins.Check for adequate combustion air ventilation openings and clean if necessary.Check vent system for partial blockage and correct as necessary.

it is a communication problem between remote control and tankless unit Temporary fix: 1 Turn off electricity to tankless and remove cover. Find two terminals that remote control connects to. 2 Disconnect remote control wiring. Turn electricity back ON. 3 Open hot water tap and see if unit works as expected. 4 Without remote, tankless will heat water to default 120 degrees F and will run without the remote. Contact Rheem they may send you another pcb board.