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

    Dec 7, 2008, 06:28 AM
    Furnace prob
    My furnace heats up for about five min then high limit switch trips. Then the flame goes out. What's causing this to happen
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 7, 2008, 06:32 AM
    Try the blower motor or its control system. Have you changed the air filter.
    jhnluth's Avatar
    jhnluth Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Dec 7, 2008, 06:45 AM

    Changed filter checked blower every thing is clean the flame starts it stays on for a few min then the switch trips
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Dec 7, 2008, 06:50 AM
    You will need to test the motor control system in the heat mode and also the blower motor itself. There is a wiring diagram on the back of the blower door. You will need a electric meter,tools and the knowledge of how to use them to effect the repair.

    Problem: The blower is not removing the heat from the furnace causing the unit to stop working. The overheat/high limit control (safety) is turning off the burner to the furnace to prevent a fire or other problems.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #5

    Dec 7, 2008, 08:51 AM

    If you have air conditioning on this same system, the indoor coil may be blocked with dirt, causing the same effect as a clogged air filter.
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