Continental Furnace Troubleshooting Flow Chart

Is your furnace... The problem might be your... What's wrong? How you can fix it:
Not heating? Circuit Breaker/Fuse Either the furnace’s circuit breaker has shorted or the fuse is blown. You’ll have to replace the blown switch or reset the furnace’s circuit breaker.
Igniter Your furnace’s igniter may be either cracked or defective. Should the igniter be cracked, you’ll have to replace it. Otherwise, test with a multimeter for continuity.
Cycling irregularly? Thermostat The thermostat is likely not adjusting correctly. If your thermostat has an adjustable calibration scale, use this to adjust the heat anticipator. If this doesn’t work or isn’t an option, replace the thermostat.
Not blowing hot air? Blower Motor Your unit’s blower motor has either burned out or the connecting belt has snapped. Troubleshoot to see if the blower motor is receiving power: if it isn’t running, the motor has failed, and you’ll have to replace it. If it does run, then the connecting belt has snapped, and you’ll have to replace the belt.
Blowing too much air? Control Board The relay that regulates the amount of voltage that is sent to your furnace’s blower motor on the control board has failed. You will have to replace the control board.
Thermostat Your thermostat’s contact that controls the blower motor’s functions might be stuck in a closed position. You’ll have to use a multimeter to check for continuity if this appears to be the issue then replace the thermostat.
Starting and then stopping shortly after? Flame Sensor Your furnace’s flame sensor detects whether or not a flame is present. Should the sensor be dirty or defective, it will not be able to read a flame’s presence. If the flame sensor is dirty, use an abrasive pad to wipe it clean. If it’s defective, replace the flame sensor.