Furnace fires up just fine, and fan spins but there is absolutely no airflow in duct work. Any ideas? Last spring thermostat went out and I replaced it, worked great. A month later circuit board burned out, tech found that problem and replaced it (major pocketbook ouch) and everything worked...

Furnace fires up just fine, and fan spins but there is absolutely no airflow in duct work. Any ideas? Last spring thermostat went out and I replaced it, worked great. A month later circuit board burned out, tech found that problem and replaced it (major pocketbook ouch) and everything worked...

A friend recently purchased a home with a Carrier Weathermaker 8000 residential furnace (forced air heating). It's finally getting cold and they tried to fire up the heater but the system did not work. I took a look at things, and the system passes the self test sequence, and even goes so far as...

This problem just started. Hile furnace w/ST9120B fan board will start up normally but blower no longer engages. Limit switch then of course shuts it down after a period. Previous posts do not really address a solution or diagnostic check to this issue. I do understand electrical/electronic...

The furnace fires up for a few minutes but the blower motor doesn't engage. Then the safety switch kicks in and turns the flames off. You can hear the click of the relay and the low moan of the motor trying to go. Sometimes it'll click on.. you hear the motor strain... then click off, then click...