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    mnovick43's Avatar
    mnovick43 Posts: 3, Reputation: 1
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    #1

    Sep 18, 2012, 07:04 PM
    Miller furnace that blower won't come on at warmup temp
    I have a Miller model MGHA-077AAFC-01 furnace I have replaced the limit switch and the aux limit switch it will turn on when thermostat calls for heat but blower does not turn on when chamber heats up. I can manualy switch blower on anyone have any ideas thanks
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Sep 19, 2012, 11:30 AM
    I have a Miller model MGHA-077AAFC-01 furnace I have replaced the limit switch and the aux limit switch it will turn on when thermostat calls for heat but blower does not turn on when chamber heats up. I can manualy switch blower on anyone have any ideas thanks

    You did not replace the FAN LIMIT which makes the fan work in the heat mode.

    Fan Limit-115 Part number 22 see page link below.

    http://www.mobilehomedepotmi.com/parts_pages/htg_ac/furn_mghammha.html

    OR search that site.
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