Question about Rheem Paloma PTG-42PVN / RTG2-42PVN Natural Gas Indoor

1 Answer

Starting unit very difficult

Model: PTG-42PVN
SN: PJNG 0904P000024
Unit purchased at HomeDepot.
The burner ignites for ~3 secs., goes out then lights again for ~3 secs. then flashes C2-11.
It has always had problems, which I thought were due to a very old undersized gas line from the meter to the house.
This has now been replaced, but the problem still exists and is getting worse.
The gas and water pressure are good, the electrical ground is good, and the vent is clear. The vent is vertical and is only ~18'' long.

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  • vakog May 10, 2010

    I think I may have fixed it =;-)
    Disconnected power, gas and water off.
    I took the front cover off, then the circuit board cover.
    Removed 2 screws holding board in.
    Removed quite a few screws holding burner chamber cover. BE CAREFUL NOT TO DAMAGE THE GLASS FIBER GASKET.
    Removed screw that holds control panel.
    Checked all hoses were okay and well connected to sensors etc.
    Disconnected and blew out short hose that checks room pressure, this has a small brass jet in the end of it.
    Fasten control panel and circuit board back in place and put the cover back on. Ensure board does not touch anything it shouldn't e.g. on my unit the cable clamp behind, center top, where the board sits was proud and caused the board to bend when screwed down.
    Turn water on and power up. Switch faucet on, fan blows for several seconds then shuts down with A1 error, that's expected as front cover is off. Repeat a couple of times.
    Power off. Took a toothbrush and cleaned flame rod (right hand side of burner) and spark plug (left hand side of burner). Cleaned burners.
    Repeated fan blowing a couple of times.
    Replaced burner cover. BE VERY CAREFUL AND MAKE SURE THE GLASS FIBER GASKET IS IN PLACE AND IS EVEN.
    One of the screws stripped the thread, so I replaced it with a #6 stainless screw and nut. The screws need to be fairly tight as if the cover leaks a) it's dangerous and b) the unit may not work correctly (I think this may have been part of the issue for me).
    Replace front panel.
    Turn on gas, water, and power. See if it works any better...
    In my case it seems to be working (for now !)



  • vakog May 16, 2010

    My bad, I described the position of the the flame and ignition plugs the wrong way around !
    It should be:
    "flame rod (left hand side of burner) and spark plug (right hand side of burner)..."
    Just an update it's still working perfectly =:-)

  • vakog May 16, 2010

    I don't think it was the thermocouple, as it would nearly always start straight up first thing in the morning. I hadn't noticed this, my wife told me about it during this week !

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  • 349 Answers

Check your thermocoupling, because it seems like it isn't sensing the flame.

Posted on May 12, 2010

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