Question about Rheem Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm

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Richman gas lp tankless hot water heater. used for infloor heat and kitchen and bathroom hot water. getting c2 and 11 error code. water temp. setting 120. ran great last year. made no changes. we have very soft water.

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I had the same problem with my Paloma a year and a half after installation...contacted Rheem\Paloma\Richman 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.

Posted on Nov 11, 2009

  • Anonymous Nov 11, 2009

    I just had the same problem and I fixed it in about an hour or 2. First shut off the gas,water and power(unplug it) Take off the cover There are about 20 screws above the electrical circuit board. You have to remove all of those screws to remove plate that is covering the burner assembly. The burner assembly has these 3 pins that look like number 7's these are covered with build up and gas can't flow right. That's why you get the c211 error not enough gas. Take a wire brush and gently remove any build up, I also cleaned the thermocoupler which is next to the burners. It looks like a metal pin with a couple of wires coming out of it this was also very dirty. I took a can of air and basically freshened it up It works perfect now. Email me with any Q's at [email protected] Good Luck All that you need is a long phillips screw drive and a drill because its about 25 screws
    The burner assembly has 2 screws all the in back underneath the assembly once you remove those 2 the assembly comes out . You don't have to disconnect any wires.

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