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    frank1969's Avatar
    frank1969 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Mar 22, 2008, 09:33 AM
    Blower ignites but goes out before fan comes on
    :mad:
    On a nordyne-cmf80-pg-di-n lp gas heater what is causing the blower to ignite,then turn back off before the fan system ingages??
    N0help4u's Avatar
    N0help4u Posts: 19,823, Reputation: 2035
    Uber Member
    		  
    #2

    Mar 22, 2008, 09:38 AM
    Sounds like a bad thermocoupler
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Mar 22, 2008, 11:32 AM
    Trying to run the furnace at a reduced temperature.

    The burner starts, heat exchanger warms up and just before/as the fan starts the burner cuts out. The burner immediately starts the purge/start cycle but by the time the burner starts the heat exchanger has cooled enough to stop the fan so it just does the same thing again.

    Does the above sound like your problem?
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