Furnace Blower Low Speed Only

The gas kicks on and is lit by the ignitor.

Furnace blower low speed only.

Looks like low is 1 2 of the highest speed for a better constant fan and use very little juice. Your furnace s manual tells you whether or not the furnace is blowing low medium or high. The furnace operates for two minutes or so before it shuts down. The gas is shut off and the induction motor stops running while the blower motor continues to run at low rpms.

While the black is high the blue is medium and the yellow is often low. We have 2 of these furnaces and the functioning one is much louder and blows a lot more air at both settings i just wanted to clear that. If your unit has either of these then the low speed problem may have other causes. Each wire has a different speed that it blows when connected.

This isn t always the case though so it s important to check the speed with the manometer. Models with variable speed blower and inducer motors can deliver consistent temperature control all year long and enhanced humidity control as a part of your air conditioning system. The blower motor also begins running but at low rpm. It wires similarly and works the same with 1 2 speed constant fan.

Not only that but our energy star. It has a replaceable surge protector standard which is great since most ecm failures are electrical that blow sacrificial thermistors. An incorrect low torque setting yields low blower speed. Comfort sup sup 95 ultra low nox gas furnace 59su5 https.

Our 90 afue rating gas furnaces include two heat. I know that the blower motor should have 3 speeds i checked the wiring when testing the capacitor the heat wire is connected to the med speed and the cool wire is connected to the high speed.