Name: Control Board
Brand: Lennox
SKU: i2332607
Price: 161.45 USD
Availability: InStock

image

G21Q3-80-1-1

GCS20H-311-75-3P

Furnace not heating

The control board regulates the power supply to all of the components of the furnace. If the control board fails, it might not send voltage to the ignition system, causing the furnace not to heat.

Furnace starts then stops

The control board regulates the power supply to all of the components of the furnace. If the control board is defective, it might not send voltage to the ignition system, causing the furnace to shut off after a few minutes.

Furnace blower not running

The control board regulates the power supply to all of the components of the furnace. If the control board is defective, it might not send voltage to the blower motor.

Furnace blower runs all the time

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. 

Furnace not turning on

The control board regulates the power supply to all of the components of the furnace. If the control board fails, it might not send voltage to the ignition system, causing the furnace to not turn on.

Furnace burners won't stay lit

The control board regulates the power supply to all of the components of the furnace. If the control board is defective, it might not send voltage to the ignition system, preventing the burner from staying lit.

Furnace takes too long to heat the home

The control board regulates the power supply to all of the components of the furnace. If the control board is faulty, it may only send intermittent voltage to the ignition system, causing the furnace to take too long to heat the home.

Furnace blower is running constantly but there is no heat

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.


Strange smells coming from furnace

The control board regulates the power supply to all of the components of the furnace. If a component on the  control board fails it can produce a burning smell. If the control board is burnt it will need to be replaced. 


Furnace is frequently cycling/short cycling

The control board regulates the power supply to all of the components of the furnace. If the control board fails, it might  send intermittent voltage to the ignition system or blower, causing frequent cycling.

Furnace circuit breaker keeps tripping

The control board regulates the power supply to all of the components of the furnace. If the control board shorts out it can trip the circuit breaker. A shorted control board will usually have burn marks or smell burnt and will need to be replaced.

Furnace wall thermostat not working properly

The control board regulates the power supply to all of the components in the system. If the control board fails, it might not send voltage to the thermostat, leaving the thermostat inoperable.


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Control Board

Circuit Board & Timer

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