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

5 Answers

Tankless water heater (Paloma) Has C2 11 error

Starts up and then shuts off after about 5-10 seconds Gas is hooked up

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  • mariomadriga Oct 29, 2009

    SOLVED
    Solution # 2 the Cleaning is the problem.

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I had this problem with the C2 11 error code. My unit is 1.5 years old. I called Paloma and they emailed me an 11 page document to clean the burners. I am not an HVAC but I got the feeling that's who the instructions were for. Very difficult but you can do it if you're handy. You basically take apart 1/2 the unit, be carfull not to lose any screws and label all the little brackets that come off. It took me 2-3 hours to get to the burners. I used a can of air (for keyboards-electronics) to blow on the burners and clear any build up. After putting it back together (carefull to make sure the 3 gas tubes make a seal when re-installed) the unit works. I did this today so I'm not sure the unit will still work in a week/month. I am dreading having to do this every year to keep the unit running.

Posted on Oct 21, 2009

Testimonial: "THIS WAS THE PROBLEM THANKS"

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  • jzollitsch Oct 29, 2009

    "Just wanted to know if the water heater still works after cleaning the burner"



    After a full week, everything still works fine.

  • jzollitsch Jan 12, 2011

    Cleaning the burners the way I described in the first post was only a temporary solution. Just like sjackel, I found myself cleaning it every 3-6 months. In the end, the cleanings only fixed it for a month or so. I've heard 10 different reasons from experts and Paloma/Rheem as to why this occurs. The most common was a poor gas / air mixture. When the unit is warm, the mixture is too rich. Rheem sent me a few replacement parts including a new board but nothing worked.
    Finally I talked to Rheem to go over all the documented problems over the years and how no solution they provided properly fixed the heater. I got them to send me a replacement unit which still needed installation. It wasn't an easy swap since the new unit from Rheem needed special venting (intake and exhaust in a double lined 4" tube). It was intalled as our house was on the market and sold weeks later. I am thrilled I will never have to deal with this again as my new home has a traditional 50 gallon heater, which will be replaced with another traditional heater some day. I will likely never go back to a tankless.

  • drdaveyo Aug 20, 2011

    DON"T EVER BUY ONE OF THESE........THEY ARE JUNK

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Clean the air filter even if it looks clean. The air filter is located in the front panel(unscrew knob to open door)...filter looked ok to me but cleaned it under water and that fixed the problem. Note: I cleaned the water filter first and that did not solve the problem. A simple test to see if the air filter is the problem...take the panel door off, press the filter door button and test hot water usage.

Posted on Jul 16, 2010

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Just wanted to know if the water heater still works after cleaning the burner ?
johenkel

Posted on Oct 28, 2009

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  • johenkel Jun 07, 2010

    Okay, just ran across my old post.

    I did clean the burner and it solved it
    Now 8 month later it happened again. I am taking it apart right now.
    Our unit hangs in our work shop where there is dust.
    I guess I need to protect the intake better.

    Next time we buy a on-demand, I will get a Rinnai system. It draws air from the outside and uses it for the burn. Whole unit is closed off from the location where it is installed. Will work better here. (*mental note*)

    johenkel


  • sjackel Jan 05, 2011

    I had the same problem, but it would only happen after using the heater first. That is, first use after sitting for a while would work then second and subsequent uses would generate error code. I cleaned it out as above and it solved the problem for about 6 months. Cleaned it again and solved the problem for 3 months. Contacted Rheem and they sent out replacement (not sure what the name is - the j shaped spark things) and that solved for about 3 months. After it started failing again they sent out a new circuit board but that didn't solve any problems. After it happened again they said it was an improper installation because it didn't have a condensate trap even though directions clearly state it's not needed as my 6' run has the required downward slope. It now always generates the code and cleaning it out no longer helps. I trhink I've taken it apart about 7 times now in the less than two years I've had it. I will try contacting them again but very unhappy with unit right now. New units have a condensate trap built right into the adapter.

  • jzollitsch Jan 12, 2011

    Cleaning the burners was only a temporary solution. Just like sjackel, I found myself cleaning it every 3-6 months. In the end, the cleanings only fixed it for a month or so. I've heard 10 different reasons from experts and Paloma/Rheem as to why this occurs. The most common was a poor gas / air mixture. When the unit is warm, the mixture is too rich. Rheem sent me a few replacement parts including a new board but nothing worked.
    Finally I talked to Rheem to go over all the documented problems over the years and how no solution they provided properly fixed the heater. I got them to send me a replacement unit which still needed installation. It wasn't an easy swap since the new unit from Rheem needed special venting (intake and exhaust in a double lined 4" tube). It was intalled as our house was on the market and sold weeks later. I am thrilled I will never have to deal with this again as my new home has a traditional 50 gallon heater, which will be replaced with another traditional heater some day. I will likely never go back to a tankless.

  • sjackel Aug 02, 2011

    I finally figured out what the problem was. Looking at the burners from the front there is a vertical slanted tube on the right sideof the unit right at the front. There are two wires running to what turns out to be some type of probe. I had to completely take the burners out to get at this tube, took out the probe thingy which was black, cleaned it off, reinstalled everything and it worked perfectly. I haven't had a problem since and it's been about 6 months now. I expect at some point it will fail again but at least I can do the extra step and make it last longer.

  • limron Aug 10, 2011

    I had a similar problem with C2 11 error where Rheem went through with me to diagnose the problem. The asked if I use any flex gas hose/line connecting to my tankless ... which I stated yes. The installer installed about 10 feet of 3/4" hose connecting from the 1" main line. Rheem stated the maximum allowable for flex hose is 3 feet. They proceeded to send a replacement burner unit which fixed the problem for about 2 months. I received the c2 11 error message again last week on the replacement burner and called Rheem. The support person asked if I replaced the flex hose.... which I have not. I will look to replacing it the next couple of days with steel pipes and keep my finger crossed that it will fix the problem. As an interim fix, I cleaned up my original burner unit and reinstalled it. It has been working for a couple of day and I'll count my blessing it stays that way until I change the gas pipe.

  • Kent Milberger
    Kent Milberger Jan 26, 2013

    The problem is that you are getting condensation back into the heater from the exhaust line. When it drys it plugs up the gas ports . Stop the condensation from going down into the unit and most all the problem will go away.

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Overheat stat or fan best of luck

Posted on Oct 16, 2009

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You need the RHEEM TRAINING MANUAL ninja59@peoplepc.com

Posted on Mar 11, 2011

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