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    pheins's Avatar
    pheins Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Oct 25, 2008, 11:31 AM
    Inoperative furnace
    I have a Tempstar DC 90. Waking up to a cold house I discovered the small blower was running but the furnace would not light. I took everything apart that I could and cleaned everything. It started but once it shuts off it won't relight. I managed to get it running twice but always with the same effect. It won't restart. However the small blower does come on. What should I check?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 25, 2008, 01:35 PM
    Does the ignitor glow?

    How many blinks are showing on the circuit board?
    pheins's Avatar
    pheins Posts: 3, Reputation: 1
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    #3

    Oct 26, 2008, 06:54 AM

    The ignitor did work after the first cleaning, that's how it started but after heating the house and shutting down it wouldn't restart now the small blower comes on but nothing else happens.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Oct 26, 2008, 07:32 AM
    How many blinks on the citcuit board ?

    I hope you did not clean the ignitor. They are delicate so delicate in fact that they should not be touched while installing since the human hand contains oils that greatly shorten there life. When you power the furnace completely OFF and restart the glow coil/hot surface ignition should glow. If not it could be defective.
    pheins's Avatar
    pheins Posts: 3, Reputation: 1
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    #5

    Oct 26, 2008, 03:27 PM
    Quote Originally Posted by hvac1000 View Post
    How many blinks on the citcuit board ?

    I hope you did not clean the ignitor. They are delicate so delicate in fact that they should not be touched while installing since the human hand contains oils that greatly shorten there life. When you power the furnace completely OFF and restart the glow coil/hot surface ignition should glow. If not it could be defective.
    No I did not touch the glow bar. I don't see any lights on the circuit board. The glow bar does not light after resetting . The small blower turns on and shortly after the large blower starts. No glow bar, no gas, no heat. I changed the thermostat but that didn't do anything.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #6

    Oct 26, 2008, 05:51 PM
    Was the furnace running normally Before you changer the thermostat ?

    Was the furnace running normally After you changed the thermostat?
    MarkwithaK's Avatar
    MarkwithaK Posts: 955, Reputation: 107
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    #7

    Oct 26, 2008, 06:06 PM

    I would check the pressure switch. If the switch is already closed on a call for heat then the furnace will not fire. Sounds like your switch is staying closed and after the units cycles once and tries to start another cylce it senses the switch closed.
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