Carrier Furnace Inducer Motor Does Not Start

If the draft inducer does not start then you probably either have a thermostat thermostat wiring problem electrical problem control board problem or a bad draft inducer.

Carrier furnace inducer motor does not start.

All modern microprocessor controlled furnaces by manufacturers such as carrier include a self diagnostic procedure to test the function of the inducer motor. If the unit will turn on but the blower motor is not turning on there are a couple of ways to check if the draft inducer motor has gone bad. The first thing that is supposed to start when a furnace starts up is the draft inducer. I don t see how that could be causing the board to not send enough voltage to the inducer but i m wondering if maybe the capacitor breaking caused some feedback issue to the board that might have damaged it.

This problem of getting a humming noise along with little to no spinning is very common with motors that do not have good quality capacitors. If your furnace blower motor hums when it s switched on but at the same time does not actually turn the capacitor may be damaged. Or if it does it s going to be weak or start and stop repeatedly every 30 seconds or so. I have performed the equipment test.

A failing inducer motor may create a noise shortly after a heating cycle begins. If the pressure sensor switch does not sense operation of the inducer motor within 10 seconds however the processor aborts the start up sequence and the burner does not light. You have a blinking light on the control board that will tell you whats wrong or what to check first. If the draft inducer does not start then you probably either have a thermostat thermostat wiring problem electrical problem control board problem or a bad draft inducer.

If you kill power going to the furnace and try to restart will the inducer motor try to start. A quick test of your capacitor can tell you a lot.