furnace fan not working on auto

The first thing that you should do if your furnace blower isnt turning on is change your thermostat to fan-only mode. You could look in the furnace and locate the blower wire that is on the heat terminal of the board and then find one that is on park and switch the two and see if the blower.

Furnace Fan Set To Auto Or On Pro Service Mechanical

If your furnace fan wont turn off your thermostat may need to be switched to AUTO the limit switch may be in manual mode and there may be faulty wiring or switches.

. After resetting breaker I tried again. The gas furnace would start flames ignited but the blower would never come on when. Then turn the thermostat to a temperature thats lower than the current room temperature and wait 3 to 4 minutes.

Lets be sure that is the right one. The thermostat is just a fancy switch but your furnace must have the necessary. The fan works fine on air conditioner auto.

Two of the other three will go to the fan relay control. I am having sort of an odd issue. Which means the fan does not turn off once the furnace.

Make sure your thermostat fan setting is on AUTO not ON. You can check which of these is at fault and fix it or replace. Perhaps your blower motor has burnt out and you need a new one.

If so check whether the fan is switched ON on the thermostat. My furnace blower turns on and off just fine with the t-stat fan switch in the auto position but if I want to just turn the blower on manually it. Fan-only mode also called fan mode does not heat or cool.

Everything goes as it should except when time for blower fan to come on. Find it on the wiring diagram glued to the inside of the furnace service panel. While your thermostat may be at fault only an HVAC.

The part they are probably leaving out is that on the thermostat they are switching the fan to ON in order to get it work. We can turn on the fan manual and that works OK. If your furnace isnt working but the fan is theres a problem with the air filter the high limit switch or the ignitor.

If the fan does not start you have a wiring issue circuit breaker trips or motor problem circuit breaker does not trip. Check whether your furnace uses a heat-activated blower fan. The burner comes on but the auto fan wont come on.

Check whether your furnace is switched ON and producing heat as the fan only runs in AUTO mode during the heating cycles. Is your furnace blower motor not working and there is no air coming out of your vents. Documenting how i diagnosed and replaced the Fan Limit control switch.

If you have a green wire it would connect that red power to the green activating the fan. If so it should come on. It doesnt come on if in auto mode but if I put it in the on mode.

Furnace fan not working on auto.

Manual Fan Mode On Thermostat Doesn T Work But Auto Does Doityourself Com Community Forums