Furnace lights but fan won't start

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Furnace lights but fan won't start

Postby skierman » Tue Jan 18, 2011 2:10 am

I have a trane furnace and when I start the furnace, the inital blower comes on, then the ingiter glows, the gas valve comes on and lights the propane. The flame burns for a couple of minutes and then turns off. The main blower fan never starts before it shuts down. I switch wires on the capacitor so both white wires were on the same side and the fan comes on and stays on so I know that the fan will work. Do capacitors ever go out? I noticed that the area where the curcuit boards
are got wet. I dried it out. The Robert Shaw Ingniter modules appears to be working. It has a steady "Heart beat" flashing green light that indiates normal operation according to the face plate. I also notice that the Honeywell thermostat say "AC" when the after furnace turns off.
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- Furnace lights but fan won't start

Postby nomadpeo » Tue Jan 18, 2011 7:05 am

ac on the thermostat sometimes indicates you lost 24 volt input to the thermostat. do you have a meter ? verify 24 volts between w an c at the furnace after it shuts down. is this a split system ? did you determine the source of the water ? if you turn your fan auto/on switch to the on position, will the blower run ?
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