I do not have an operations manual nor can I find one online that will tell me what it means when my Criterion II heater has a LED light that flashes 4 times and will not kick on. I can get the heater to come on by jiggling wires, but once it goes off again, it will not come back on. The heater is...

Furnace blower fan and the pre blower fan come on at same time. And the ignitor won't light. Have to turn off power switch to stop both fans. I changed upper limit swith but still won't work. When it was working it was going great, returned and blower was running only but no heat. Thermostat...

It is now about 57 degrees in my house. My furnace just turned on but there was no ignition, no flame. I could hear the blowers running. Is my flame sensor bad or dirty? Or is it something else? How do I fix this? I have fixed my furnace before with a new flame sensor or something like that. I...

Have a rheem furnace and when it turns on it blows real hard something I read said it has a three or four speed motor just wondering if some one could help me change the wires to lower the speed of the motor

My air went out yesterday and I don't what to do... the motor outside is not working but the inhouse fan is work air is coming out of the vent but it is not cool. This happened in the winter and we had the heat ignaitor replace... help?? it 98 degree today