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i don't know. it may be your blower or your motor that needs to be inspecvted. be very careful. shut off power to furnace. turn thermostat to lowest setting. shut off circuit breaker for furnace or remove fuse for furnace. open blower panel; and pull drive belt [ i f furnace has one ]
that turns the blower. if it turns, the blower is OK i suspect the motor needs repair. https://www.repairclinic.com/RepairHelp/Furnace-Repair/36-383--/Coleman-Furnace-Troubleshooting
see your symptoms and click on 'see video' at right of
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Furnace blower not running ".........
You need to check the motor amp draw against the spec tag on the motor. If the motor has power to the motor wires it's either the motor or the run capacitor.
Your furnace is shutting off on the high limit switch because of this. You are having a problem with the blower motor. You need to check for power from the wires on the board that feeds the motor. If you have voltage, and your run capacitor is good, you have a faulty blower motor. If its a fan relay, the fan would start and run all of the time. Check power to motor right after furnace shuts the burners off. Robert Horton
Sometimes a "Flame Sensor" gets carboned up and does not detect that the furnace has ignited, so it shuts down the fuel source. Might try cleaning that if so equipped.
I would turn the furnace off, locate where the blower motor is, usually near the filter.. If you are capable,
reach in and try to turn the blower wheel. If does not
move, its possible the motor is bad.
If it is a multi-speed blower, change the heat spped to a different speed and see if the breaker trips, if it does then the indoor blower motor is probably bad
Yes. If the high limit is tripped, the furnace will bring on the fan continuously until the limit resets. Often, they will not reset if tripped repeatedly. If the furnace is too large for your application, you probably are not able to move enough air to keep the heat exchanger cool enough.
Try cycling the switch at the furnace to reset the blower board. If this doesn't work remove the green wire from the blower board(computer board) to eliminate a shorted t-stat or shorted wire between the furance and t-stat. If blower remains on, then blower board is shorted. I've seen all these problems.
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