To Next PageTo Next PageHow to troubleshoot Nortron Furnace that will not turn on?
If your Nortron Furnace won't turn on, check the thermostat, circuit breaker, or fuse. Also, inspect the CONTINUOUS VENTILATION switch, bottom sequencer, and transformer.
Why is my Nortron Furnace not producing enough heat?
If your Nortron Furnace isn't producing enough heat, potential causes include defective elements or sequencers, the SEASON SELECT switch being set to the MILD position, safety limits opening due to duct obstruction or dirty filters restricting airflow, a defective or incorrectly wired two-stage or outdoor thermostat, or a lack of enough cold air returns in the house.
Why does the motor in my Nortron 21B20M Furnace run continuously?
If the motor in your Nortron Furnace runs continuously, check if the CONTINUOUS VENTILATION switch is not on the OFF position, if the thermostat wires are incorrectly attached, the bottom sequencer, or the 24 V Relay.
Why does the breaker on the front panel of Nortron 21B20M Furnace trip?
The breaker on the front panel of your Nortron Furnace trips due to overcurrent on the heating element. Reset the breaker. If the problem continues, it's recommended to call an electrician.
Why is the motor in Nortron 21B20M going on and off in short cycles?
If the motor in your Nortron Furnace is cycling on and off too frequently or infrequently, the heat anticipator in the thermostat may be incorrectly set or defective.
Why the thermostat must be set much higher than desired temperature in Nortron 21B20M Furnace?
If the thermostat needs to be set much higher or lower than the desired temperature in your house when using Nortron Furnace, the thermostat may not be leveled or could be out of calibration.
Why Nortron Furnace is not producing enough heat?
If your Nortron Furnace isn't producing enough heat, consider these potential causes: one or more defective elements or sequencers, the SEASON SELECT switch set to the MILD position, safety limits opening due to duct obstruction or dirty filters restricting airflow, a defective or incorrectly wired two-stage or outdoor thermostat, or a lack of sufficient cold air returns in the house.
What to do if the motor in Nortron Furnace runs continuously?
If the motor in your Nortron Furnace runs continuously, check if the RECIRCULATION MODE switch is not in the OFF position. Also, inspect the thermostat wires for incorrect attachment to the furnace, the bottom sequencer (as the bottom heating element might also remain on), and the 24 V Relay.
Why does the thermal cut-out open in Nortron Furnace?
The thermal cut-out in your Nortron Furnace may open because airflow is reduced due to blocked ductwork or very dirty filters. Ensure that these components are clean and unobstructed.
What to do if breaker on front panel trips in Nortron Furnace?
If the breaker on the front panel of your Nortron Furnace trips, it may be due to overcurrent on the heating element. Reset the breaker. If the problem persists, it is recommended to call an electrician.
Essential warnings and cautions for furnace operation, installation, and maintenance to ensure user safety and prevent hazards.
Detailed electrical schematic for the 21B10M furnace, showing component layout and wire connections.
Detailed electrical schematic for the 21B15M furnace, showing component layout and wire connections.
Electrical schematics for 21B18M and 21B20M furnaces, illustrating component layout and wire connections.
Detailed electrical schematic for the 21B25M furnace, showing component layout and wire connections.
General
