How do I wire a induce fan motor

Double check the wiring connections, maybe you have the pilot valve and the main valve wiring reversed. I had a call one time where the homeowner installed the gas valve backwards, so no flow and of course and the wiring on the three terminals was reversed.

The inducer should start whether or not the gas valve is wired wrong, unless it is wired in parallel with the pilot valve.

since there is no model number to go by, let's go generic. Most inducer motors have some way of "proving" it is running to the control board. It may have a centrifugal switch in it or it may have use some type of air pressure switch. The centrifugal switch will usually have 2 wires other than the power wires and most of the time, go to the rear of the motor. The air switch usually has a small rubber hose that pushes onto it and is connected to the fan housing.

The induced draft motor you describe has a pressure switch proves the induced draft motor is running, it is about 4 inches across and silver and flat and round, it has 2 wires and a tube that atttaches to the induced draft assembly onto a barbed port, this barbed port will obstruct with carbon and needs to be cleared annually with a tiny dril bit or similar device.

I ran into a simalar problem and it was a short in the control wiring of the furnace. When there is a call for heat a relay closes to start the inducer the movement of air causes by the inducer closes the air pressure switch. This is where the problem starts.some where in the control wiring there is a dead short this causes the secondary (24volts ) to drop causing the inducer relay to open shutiing off the inducer which in turn opens the pressure switch removing the short and the cycle starts over again. The culprit in my case was the high limit switch which was shorting against the metal furnace housing. You can easily ccheck this by removing the two wires from the fan limit switch and powering up the unit to see if the inducer runs normally . If it does remove limit and replace if necessary.
hope this helps

Hi,
If the inducer fan is out of balance that badly, then you will need to replace the inducer anyway....it will shake its self apart....
Me I would have fixed the wire and then ordered a new inducer right a way and then installed it in a few days when it arrived...in is trouble waiting to happen...
Put the wire back on and get a new inducer coming...

heatman101

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Failed control board. Replace circuit board.

Have the model # off the inducer motor and furnace ready go to this website http://www.electricmotorwarehouse.com/fasco/rheem_draft_inducer.htm find what motor is yours .replacing will be quite easy the bolts, hose and wiring will all be exact. Then unscrew the vent pipe from the inducer remove the nuts holding it to the furnace unplug the electrical connection a little rubber hose and you're ready to remove the old one. All the directions you need to install the new one will come with it.

Hope this helps.....

Most inducer fan now come as a whole assembly. Some people can change themselves but make sure if you try this to get all the old gaskets off and be careful.

take off the door panel and look to the inside. It will have a wiring diagram, legend, and color codes for the wires. The combustion motor or inducer fan should be small enough that it doesnt need a capacitor. The indoor fan motor or squirrel cage does.

Your induce fan motor is burnt out or the senor is out. If the little fan is working its just the senor. Your going to need a repairman to find the senor or motor for you. You can replace the senor but I wouldnt recommend replacing the motor. www.fastacservice.com