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    johnb 1's Avatar
    johnb 1 Posts: 5, Reputation: 1
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    #1

    Jan 13, 2014, 08:35 PM
    Coleman furnace 3400-816
    When the thermostat calls for heat the elements heat but the blower does not come on even with the switch in the run position . This happens randomly if you turn the switch from auto to run several times it will eventually turn the blower on . What part needs to be replaced ?
    hkstroud's Avatar
    hkstroud Posts: 11,929, Reputation: 899
    Home Improvement & Construction Expert
    		  
    #2

    Jan 13, 2014, 09:26 PM
    What part needs to be replaced
    I don't know, but I would be looking at the fan relay. Sounds like it is failing and by switching back and forth between fan and auto you are intermittently getting it to work .
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