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had the same problem with mine. If you follow the line from the blower , you will see it goes into a pressure switch. When there is enough pressure in the line, that tell the switch that the blower is working and it closes the switch, goes from open to closed.
It's a small device. with 2 pneumatic lines going into it and 2 electrical contacts.
this was the problem with ours. the fan blower would come on, but the furnace wouldn't ignite the burners because the defective switch would not close the circuit.
The switch is about a 30 dollar part. you may have to remove it to get the part no. from it. Make sure the furnace electricals are all shut down before removing the switch.
To prove this was the culprit, i had to bypass the switch all together (temporarily) but manually closing the contacts, make an electrical jumper, and the burners ignited
Last edited by on-ramp; 09-18-2007 at 06:14 PM..
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