Goodman GMH95 furnace - Inducer motor continuously running
#1
10-25-15, 01:03 PM
Goodman GMH95 furnace - Inducer motor continuously running
Hi,
My inducer motor is continuously running - even when furnace is off at thermostat.
I suspect the relay on the control board is stuck, and thus the control board needs to be replaced.
Is there something else i can check before i go down that road?
what else would cause the inducer motor to stay one that i can check?
Thanks
My inducer motor is continuously running - even when furnace is off at thermostat.
I suspect the relay on the control board is stuck, and thus the control board needs to be replaced.
Is there something else i can check before i go down that road?
what else would cause the inducer motor to stay one that i can check?
Thanks
#2
10-25-15, 01:12 PM
Group Moderator
Welcome to the forums.
I need to confirm but on many furnaces.... when a safety stat opens..... the blower(s) are locked on. This lets you know there's a problem. There should be a trouble code blinking on the control board in the blower section. See if there is a sight glass on the blower door and look in.
Goodman trouble codes....
I need to confirm but on many furnaces.... when a safety stat opens..... the blower(s) are locked on. This lets you know there's a problem. There should be a trouble code blinking on the control board in the blower section. See if there is a sight glass on the blower door and look in.
Goodman trouble codes....
#3
10-25-15, 02:41 PM
Banned. Rule And/Or Policy Violation
>
That's a likely cause of the problem. But use an AC voltmeter to check to see if you have 24 VAC on the W terminal. Any time you have 24 VAC there, the inducer motor will run. That could be caused by a thermostat that is staying on.
That's a likely cause of the problem. But use an AC voltmeter to check to see if you have 24 VAC on the W terminal. Any time you have 24 VAC there, the inducer motor will run. That could be caused by a thermostat that is staying on.
#4
10-25-15, 05:09 PM
Most hot air furnaces have a temperature sensor that has a contact (temperature selectable) that keeps the fan motor powered after the burner goes off (thermostat satisfied) to remove the residual heat until the decreasing temperature opens the contact removing power from the fan motor. This temperature sensor operates by rotating in response to temperature changes. A cam on the rotating member operates the contact in the fan control circuit.
The temperature sensor is a mechanical device that sometimes gets stuck and will unstick with a tap to the sensor. The sensor is usually located on the burner side of the furnace near the top. The furnace cover must be removed to gain access to tap the sensor.
The temperature sensor is a mechanical device that sometimes gets stuck and will unstick with a tap to the sensor. The sensor is usually located on the burner side of the furnace near the top. The furnace cover must be removed to gain access to tap the sensor.
#5
10-25-15, 05:35 PM
Group Moderator
Bz..... that control you are describing would affect the main blower fan.
In this case the OP's draft inducer is staying energized.
SP... normally.... when there is power on the W terminal you would get heat.... not just the draft inducer running. The problem here is a defective relay or open safety.
In this case the OP's draft inducer is staying energized.
SP... normally.... when there is power on the W terminal you would get heat.... not just the draft inducer running. The problem here is a defective relay or open safety.
#7
10-27-15, 04:38 PM
Banned. Rule And/Or Policy Violation
>
Normally, yes. But we are dealing with a furnace that isn't working normally.
Checking to see what the thermostat is doing by measuring the voltage at the W terminal is just being thorough and eliminating possible problems, in my view.
Normally, yes. But we are dealing with a furnace that isn't working normally.
Checking to see what the thermostat is doing by measuring the voltage at the W terminal is just being thorough and eliminating possible problems, in my view.
#8
10-27-15, 09:29 PM
Member
disconnect w completely, tape it off, restart and see what happens.
on some furnaces the inducer may start running if there's a flame sensed when no call for heat error; could be caused by an issue in the board or a maybe even a tiny short to ground in the flame sensing circuit.
on some furnaces the inducer may start running if there's a flame sensed when no call for heat error; could be caused by an issue in the board or a maybe even a tiny short to ground in the flame sensing circuit.
