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

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Paloma PTG 74PV N1 Tankless Water Heater - stops heating

After 1 to 15 minutes, the water heater will stop working. Was in the shower this morning and the heater stopped heating after about 10 minutes. This evening after coming home from work, it stops about 20 seconds after water gets hot.
I installed the water heater myself and am familar with its construction and venting. No issues with exhaust venting and the inlet screen is clean.

Any advice?

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  • David Harrison Apr 15, 2009

    It was set to 110 degrees,I turned down the temp to 100 degrees. turn on the unit and it heats for about 1 to 2 minutes. I hear the fan motor increase and then slowly drop in fan speed then quit. The controller shows flashing C8 and 76 alternating. reset and tried agian, got the same codes.

  • David Harrison Apr 15, 2009

    The water supply is city. Good water low in menerals. The heater is 2 years old, have not cleaned the water screen yet this year but will do that now. The water flow is very good, no issues there, I think. The unit sounds like it is starting OK but begins to either loose airflow or someting else is stopping the unit.

  • David Harrison Apr 15, 2009

    The temperature settings is 100 to 120 degrees at 2 degree increments. If at 100 degrees it seems to run continuously (not as I stated previously) but when I increase the temperature to 104 degress or above it will shut down after a few minutes.

  • David Harrison Apr 15, 2009

    Get code C7 and 76 now.

  • David Harrison Apr 15, 2009

    Called Paloma service. They are sending a new Remote Control unit, and a circuit board for the unit. Overnight delivery.

  • dyoutz Apr 24, 2009

    I have the same problem as of about a week ago. Same model number. Heats for 1 to 15 min and stops. The first few times the unit powered off completely (incl control panel). Now the panel stays on flashing C8 and 76 alternately. That error code is not listed in the manual. Will call Rheem tomorrow.

  • bluesmang May 13, 2009

    My unit is a 7.4 gpm. it will run for a few minutes then it shuts off and I get a code or c4 and 13. HELP!

  • umbradellupo May 18, 2009

    I have a problem, same model number.
    Heats for 1 to 15 min and stops. The panel stays on flashing C8
    and 76 alternately. That error code is not listed in the manual. What could be the problem?

  • NohotH20 May 24, 2009

    Our unit is doing the same exact thing. Unit flashes 76 and will not reset. Some days I can get it to work by turning on the kitchen hot water full blast after getting the unit to reset. Today it won't work at all. Very frustrating. Have tried everything and I am looking for a solution. We are on well water. My parents who live on the same property have trouble with their Bosch hot water heater. I know it has to do with the water flow.

  • jdthefixer May 11, 2010

    >>C8 and 76 alternating. reset and tried agian, got the same codes.<<



    Sounds like you're on to something with the codes. Do you have a manual? If so, there should be an explanation of the codes and what they signify. If no manual, check and see if there is any manufactuere contact info or if they have a web site where you can get additional info.

  • jdthefixer May 11, 2010

    Has this always been an issue or is the tankless heater a new installation?



    What is the GPM and temperature rise rating of the heater?



    Is someone else using the heater at the same time?



    Are you using a municipal water supply or is it well water? Is the water pre-treated?



    Is the water hard? (more than about 10 grains/gallon)

  • David Harrison Dec 28, 2010

    I called the company, they sent instructions on how to cleaning the sensors and jet chambers. It only took me 3 hour to disassemble and clean off some white powder buildup. It's working fine now. I guess every 3 years it'll need a good cleaning again.

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Most likely problem is the remote control not the main board. A safe temporary fix is to unplug the heater from the 110 volt outlet, remove the two low voltage wires from the remote control and use a small wire nut to connect the two conductors together. Plug the heater back into the 110 outlet and the heater should work just fine. The default water temperature is about 118 degrees at the heater. Replace the remote control ASAP.

Posted on Aug 03, 2009

  • skata6 Dec 28, 2010

    Thanks for this work-around! I can be showered and sane until the replacement part arrives!

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I had this problem back in April '09. I called the toll free customer support number in the manual. The lady said that that code indicated a communication problem between the panel and the main unit. She said they would send a new main circuit board and controller. In the meantime, the work around is to unplug the power, disconnect the panel and power back on. You will have hot water but no temperature adjustment. I had the new parts in about 2 days (shipped to Hawaii) and installed them. No problems for 9 months now. :-)

Posted on Jan 05, 2010

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For the C8 76 error code.
I had the same code on my unit and called the company and they sent me a new circuit board to change out. Received it the next day and changed it out, it was easy, all plugs are different size so you can't plug in one wrong. Water heater works fine again.
Glen

Posted on May 21, 2009

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We have had nothing but trouble from day 1 with Rheem and with the Paloma tankless indoor gas water heater. It has been ongoing for almost three years now. I've been left countless times without hot water while I was pregnant, and again when my son was only a month old and there has been at least another 2 occasions in the past 20 or so months we were left without hot water. my husband follows directions over the phone from a tech support from Rheem to fix one problem after another, and now we too are having the same error code of C4 76. And yes, again, we are now left without hot water and of course it is Friday and with Rheem's reputation I have little doubt that they give a ****! just as they have not in the past. They left me without hot water for over a week just after my son was born. My husband was out of town and after Rheem had three different plumbers out here trying to fix it they finally gave in and gave us permission to get a new water heater but they wouldn't pay for the plumbers to take the unit back to Home Depot and pick up another one so I had to load the water heater in the back of my car, load up my newborn baby and pick up another water heater and bring it back. And of course I had to wait another day for the plumber to come back out to install the unit. Plumbers didn't show up until late in the afternoon and when they installed it I had hot water..........for a day. After two more days of plumbers in my home on the phone with Rheem tech support I was told that a part on the brand new water heater had been broken. So they told the plumber to just remove this piece and they "thought" it shouldn't have any effect on the unit. Well it did, the unit makes a loud humming sound every time you turn on the hot water which is great because it sits right above my sons bedroom! We have fought and fought with Rheem to replace the unit and they have refused. I have turned them in to the BBB yet have heard nothing back from them. Guess Rheem has enough money to put the BBB in their pockets. This company seems to be getting away with murder. Why have these models not had any re-calls? They are obviously faulty seeing as how this board shows so many people having the exact same problem. I suggest that rather than trying to find solutions to one problem after another we should be finding a way to stop Rheem from ripping people off! Any solutions to that?

Posted on Mar 27, 2010

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Yes, another to join the community of the same issue L76 error code whihc isnt listed in the manual. This is frustrating as never had a heater that has problem so soon (16 months). Calling the agent, hope they are not charging since most mentioned could be a controller issue.

Posted on Dec 05, 2009

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We had the same problem this past week. Our heater is about 2 years old. We called Paloma and they said the error code is the flashing "76" which means there is a circuit board problem. They overnighted the circuit board to us for replacement. Sounds like this is a common problem.

Posted on Aug 12, 2009

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It seems this thread is dead, but I'll add my comments. I had a similar problem and was shipped out a new board (over a year ago... I know... I'm slow sometimes). The gentleman on the phone was very helpful in getting it to me though.
Now came time to install and you can't just plug it in, so I was on Paloma's site to find instructions as I saw on another thread that there's a programming sequence... And I saw my heater was subject to a recall (strange though I never got the notice...).
The lady on the phone was very nice in verifying my recall and helping me reprogram (oh, and this is Sunday afternoon too!).
I give kudo's having staff on a weekend, helping me out and being friendly too (kinda makes up for the lack of a recall notice).
To do the programming:
Install the board with the program chip in it.
Turn power off on the remote.
Place dip switches 1&2 up (on the high altitude control)
Hold SW3 in and watch the led - it will flash fast first then steady.
When steady release SW3.
Place dip switches 1&2 back down.
You're done.
Note - this may not be for all heaters. I have the PTG74-pvn.

Posted on Mar 20, 2011

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I finally called the manufacturer and found out that our unit had a 3 year warranty so the company sent us a new panel board and then instructed us by phone how to install it. Problem was resolved after that.

Posted on Jan 05, 2010

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I was having the same problems with the codes and they are sending me a new board. as always everything happens on the weekend and i will have to wait till Tuesday for the board to come in. i did the temp fix with the wirenut on the remote conductors. it worked for a day or two perfectly. but now it doesnt work at all. i get no hot water at all. anyone have any idea?

Posted on Jan 04, 2010

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Just installed the replacement PCB from Rheem/Paloma. Had the same C8 76 codes, a with everyone else, they shipped me a new PCB. Since it was a Friday when it failed, and we had to wait until Tuesday for the part to arrive, I applied the "fix" of jumping the remote control wires with a nut to keep the hot water on. This was fine until today. So, instead of going to bed, I swapped te board.

New problem: Could not get the old min and max setting codes out of the system. New PCB defaults to 20 for both. It's all working now, but the hot water at the kitchen sink with the remote set to 120 F as it was before is hotter. I need to get the min and max outlet pressure settings. Does anyone still have theirs?

Posted on Dec 06, 2009

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