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Thread: Burner cuts out when blower starts

  1. #1
    Join Date
    Jan 2017
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    1

    Default Burner cuts out when blower starts

    I have an Armstrong ultra SX 80, Model #GUJ100D14, approx. 20 yrs. old. I have just replaced the control board, (bad relay) in the unit. The original ST9120A2004 board has been obsoleted by Honeywell and replaced with the ST9120U1011, which I installed. I also cleaned out the unit, flame sensor, filters and changed the pressure switch that was sticking. The problem I have now is this. The furnace goes through the ignition sequence and the burner lights normally. After about 2 minutes, the burner shuts off and the blower turns on. After about 2-3 more minutes, the blower stops and the whole sequence repeats itself. I have attached pictures of the 2 boards. Any help would be greatly appreciated!
    Attached Thumbnails Attached Thumbnails Burner cuts out when blower starts-20170117_104747-jpg   Burner cuts out when blower starts-20170120_171250-jpg   Burner cuts out when blower starts-20170120_171302-jpg  
    Last edited by BT2112; 01-21-2017 at 06:10 PM.

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