Question about Rheem Water Heaters

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Have a p1 flashing on the remote control and no hot water. I have tried shutting the water and power off and still a p1 flashing on the control unit.

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Just clean shower head and faucet with CLR solution to increase water flow. p1 means water flow is restricted. Same thing happen to me.

Posted on Oct 24, 2012

P1 is reportedly defective check valve that can cause water flow to decrease, and tankless not heat water smoothly. But can also be other causes, or combination of causes. Call service technician, contact Rheem, or replace check valve and see if problem solves. Then add a comment with solution so others can benefit from your experience.

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

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.

Posted on Mar 29, 2011

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Posted on Jan 02, 2017

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PTG-53XN error code p1. And hot water turns off.


Before calling service technician, open following link for Rheem troubleshoot resources including Rheem chat:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error codes are considered start point for troubleshooting, and can sometimes mislead.
Error P1 is 'not enough water to operate the unit:'
http://waterheatertimer.org/pdf/Rheem-Error-code-P1.pdf

This problem can be caused by plumbing problems such as crossover, or clogged water lines, or dirty water filter, or clogged water softener, or temperature of unit set too high. Or combination of these problems.
Remember if temperature is set very high, then more cold water is used at the faucet. This means less hot water is drawn through the tankless water heater, so the flow rate may drop below activation threshold.
http://waterheatertimer.org/Crossover.html
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Jul 08, 2011 | Rheem Tankless Hot Water Heater...

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I have a RMTG-53dvn piped in parrallel with a traditional water heater because I used to have two traditional in parallel. The unit never kicked on with no trouble code, so I piped in series with a...


I could see how it might not work in parallel. Much water would go thru the conventional heater, so there would be low flow thru the tankless.
Now, the tankless is getting hot water from the conventional. Try shutting the conventional heater's power source off so the water gets cold, then see what happens with the tankless.
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For the past couple of weeks, when we try to use hot water in the morning the system shuts off. The error message we get is C7. Often we can turn off the control panel, turn it back on again and then it...


Sorry to read about your problem, I hope this helps you out.

Turn the power off and remove the cover. Find the two terminals that the remote control connects to and disconnect the remote control wiring. Turn the power back on and open the hot water tap and see if the unit comes on. If it comes on, this is a problem with either the remote itself or more likely the wiring between the remote and the tankless unit itself. Without a remote it will control to 120 degrees F. and will run without the remote.


I tried to help you. Please help me and Rate/Vote on my response, thanks and good luck

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I have a richmond tankless water heater RMTG-74PVN-2 . the unit works most of the time but code c-2 comes up on the display and the unit shuts down. I shut the power off to reset this does not fix the...


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May 16, 2010 | Rheem Tankless Hot Water Heater...

1 Answer

Remote control unit flashes 76. No buttons on the remote will function. Water heater will not come on when there is a demand for hot water. Any suggestions?


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

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My Rheem Pronto model#RTG-74PNV-1 has powered off for some reason unknown, I turned the unit back on and it supplied hot water for approx. 10 minutes before it started flashing a code [C7]on the remote...


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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7 Answers

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I had the same problem with my tankless waterheater (flashing c4 76 alternately). I called Rheem
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into the wall and turn on the hot water see if it works. It did in my case and they are sending me a new remote panel. I hope it helps.........

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