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    bmb73vette's Avatar
    bmb73vette Posts: 15, Reputation: 1
    New Member
    		  
    #1

    Jan 8, 2015, 05:29 PM
    Goodman furnace
    Goodman furnace
    Everything seems to start OK but flame starts / then ends but
    Furnace won't blow or even start to blow
    Red light flashes 4 times indicates bad hi limit switch
    Can the hi limit switch cause fan not to come on?
    Or is the fan not coming on and causing the high limit switch to go into error.
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
    Ultra Member
    		  
    #2

    Jan 8, 2015, 05:42 PM
    The limit is doing it's job. It is shutting down the burners because of an overheat condition caused by the fan not coming on. Do you have a volt meter & know how to use it?
    bmb73vette's Avatar
    bmb73vette Posts: 15, Reputation: 1
    New Member
    		  
    #3

    Jan 8, 2015, 05:51 PM
    No but I can get one. Yes I have a basic idea how to use it.
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
    Ultra Member
    		  
    #4

    Jan 8, 2015, 06:33 PM
    You heat to measure voltage from the fan heating speed terminal on the circuit board to neutral. If you get +/- 120 volts, we know the fan is getting power. This measurement should be made 30-60 seconds after the burners fire but before the flames go out. If you do not get the voltage, most likely the board is bad.
    If you do get the voltage, check the fan to see if it is seized. If not, you either have an open winding on the motor or a bad capacitor.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #5

    Jan 8, 2015, 06:35 PM
    Does this furnace vent via a PVC pipe to the outside? If so check the pipe for obstructions
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