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    r spruill's Avatar
    r spruill Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Dec 9, 2009, 09:48 AM
    Circuit board for air conditioning unit
    When I turn my t stat to heat it pops my fuse in the circuit bd. The a/c works fine . I looked at the heater elements and they look fine no broken wires.when this happens I see an arc on
    Or near the board.please help.
    r spruill's Avatar
    r spruill Posts: 2, Reputation: 1
    New Member
    		  
    #2

    Dec 9, 2009, 10:00 AM

    When I turn my t stat to heat it pops my fuse in the circuit board. The a/c works fine.I looked at the heater elements and they fine no broken wires. When this happens I see an arc on or near the board. Please help
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #3

    Dec 9, 2009, 10:39 AM

    The arc may be the fuse blowing.

    I would suggest marking and removing the thermostat wires.

    Jump R to G at the furnace. The fan should come on. Remove the jumper.

    Jump R to W and the fan and heat should come on. The fan my be delayed.

    This will tell you if it's the thermostat and or thermostat wiring if it works.
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