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GrandAire Furnace blower runs all the time

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Furnace Blower Runs All The Time? Gas Furnace Troubleshooting

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Common solutions for: GrandAire Furnace blower runs all the time

01 - Control Board
The control board has relays that regulate the voltage to each component in the furnace. If the relay that controls the blower motor fails while it is closed, it will send continuous voltage to the blower motor, causing the motor to run continuously. If the control board is at fault, replace it.
Required Part
Furnace Control Board
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02 - Wall Thermostat
The wall thermostat has electrical contacts that control the power supply to the furnace. If the contact that controls the blower motor sticks closed, it will send continuous voltage to the blower motor, causing the motor to run continuously. To determine if the thermostat is defective, use a multi-meter to test it for continuity. If the wall thermostat shows continuity between the (R) and (G) terminals when the thermostat is in the off position the thermostat has failed and will need to be rep...laced.
Required Part
Furnace Wall Thermostat
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