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Trane - Stuck in the station

PCPC Member Posts: 23
I have a Trane hot water boiler (TGBWF090A93AVAA -installed 12/2008 by previous owner) that is getting stuck in lockout on a regular basis.
I get a pilot flame then after a few seconds it kicks off and goes into lockout/service required after the main burner doesn't fire.
Have cleaned the flame sensor and reinstalled (several times) and can get it going again but after the night set-back of only 4-5 degrees it locks out sometime overnight and I wake to a cold house and a locked out boiler control.
Bad flame sensor?
Thanks for any input on this unit


  • IronmanIronman Member Posts: 5,676
    It could be. Also check that you have a solid ground path all the way back to the electric panel.

    Can you post a couple pics of the boiler?
    Bob Boan

    You can choose to do what you want, but you cannot choose the consequences.
  • PCPC Member Posts: 23
    Thanks Ironman...

  • PCPC Member Posts: 23
    After some extensive troubleshooting and installing a new Electronic Ignition Control (CNT05035) we are back in business.
  • mikeg2015mikeg2015 Member Posts: 1,178
    edited February 13
    Is that a modulating atmospheric boiler? I didn’t know they existed. It says 30 min, 90 max.

    Efficiency is 80% low, 82 high.
  • EBEBRATT-EdEBEBRATT-Ed Member Posts: 7,088

    two position, lo-hi fire is my guess
  • mikeg2015mikeg2015 Member Posts: 1,178
    edited February 13
    That a huge turndown ratio for a high low 3:1. Most 2 stage gas valves are only 3:2 at best. But a typical turndown for a gas furnace is 3:1.

    Who makes this boiler? Dunkirk?
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