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Paloma tankless water heater won't stay on during operation.

I have a propane tankless heater and recently, after about a year of top service, it will not stay on. When you ask the unit to start up & run, after a few minutes, it will shut down completely. You can turn the unit back on but, the same thing happens again & again. What could be my problem ?

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  • Anonymous Dec 01, 2008

    i have apalma 74pv propane that starts up then cut off

  • jglurker Jan 01, 2009

    My Paloma tankless water heater just started doing the same thing last night. It will run for a few minutes and then cuts off.

  • Anonymous Jan 13, 2009

    We too have the same problem and after research from the plumbing company, it turns out Paloma sold some units with bad circuit boards. After 3 hours and $300, our plumber finally figured it out. Paloma apparently knew some of the units had bad boards but didn't know which ones. We're getting a new unit installed and also going to speak with a Paloma representative about getting some of our money back.

  • te3d Jan 22, 2009

    Has been shutting off recently during showers code C813 shows up. Any clue

  • J L Henager Apr 18, 2012

    Same problem. Runs for about 90 seconds, then stops running with a C8 13 error code. We turn off the unit at the remote, turn it right back on again, and get another 90 seconds of hot water. Paloma model PTG-74PVP-2, installed in September 2006. Worked flawlessly until Oct. 2011, when it began to fail occasionally, with either a C7 13 or a C8 13 error code. Now it fails each time the hot water is run for 90 seconds, unless the plumber is present. The unit is "covered" by American Home Shield's "warranty". They have sent 4 different plumbers since last October (they 'rotate' plumbing companies) and each time they have had to call Rheem, the company that purchased the original manufacturer (Paloma). The first time, Rheem told the plumber that there was no such error code possible, so he left without fixing it because it worked perfectly while he was here. The second time, Rheem told the plumber it was a propane problem, and he left without fixing it, since it worked perfectly while he was here. The third time, Rheem said the propane supply line was too small, and needed to be replaced. We had a larger supply line installed (tore up the walls and ceiling in the garage), but it continued to fail, but much more frequently. They tested the pressure (11 inches of water column) and flow rate (199,999 BTUs/hour), so we called for a plumber for the 4th time. Rheem told this guy that the flex line was restricting the propane flow, so he replaced it with a one inch flex line. AHS refused to cover the service call and flex line, because the problem was caused by an "improper installation". Apparently, the installation decays and fails after 5 years of use? On each of the 4 service calls, I told the plumber that, based on my own knowledge of electronic control systems, that I believed the problem was most likely caused by a dirty or defective combustion sensor in the unit. Each time, the Rheem "expert" dismissed the possibility of a sensor malfunction, and told the plumber not to "waste his time" disassembling the unit to clean sensors. (The unit has several sensors: combustion detection, temperature, gas flow rate, water pressure and fuel mixture ratio). At this point, I'm thinking maybe a class action lawsuit, with the purchasers of this pile of junk as plaintiffs and Rheem as the defendant, might solve the problem (or at least compel Rheem to provide schematics, test points, diagnostic information and cleaning/repair/disassembly/reassembly instructions). I think that would be fair and reasonable.


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I have a Paloma model RUTG-74PVP, I had the same problem after less than a year. The unit would operate for about 90 seconds and then shut off with an error code of C13. Paloma kept trying to blame it on "lack of combustable oxygen" ,, my unit is in the attic, so we added more soffit vents and an electric attic fan. We still had the problem and Paloma blamed it on the lack of a condensation trap (so I added one), & then on the 1" dedicated LP Gas line (so I had the propane guy come run a water column test). Finally, 4 months later , Paloma had a service man come down (100 miles away) to see what was wrong (He told them to replace it. They paid for the unit and labor. It ran perfect for about 9 months and then started doing it again. So I called the same representative and asked if they were gonna replace this one too? He said nope, it's no longer under warranty. But he did tell me how to fix it this time. It required taking the the whole unit apart and cleaning a ceramic piece in the very back of the heater. It was hard to get to, and it took about 2 hours of disassembling and reassembling. The good news is Paloma will walk you thru it on the phone and once it's was done, my system worked properly again. The bad news is,, it only lasted for about 9 months. So now I need to do it again. I'm hoping that someone will read this and tell me that there is a filter (like a gas filter) that I can install that is easier to get to.

Posted on Jan 31, 2010

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