Coleman Presidential II Furnace: No heat and blower motor is running constantly.

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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
" Furnace blower not running ".........

bad fan control switch or bad fan motor

Make sure all vents are open and filters are clean. Likely an air flow issue but possibly, though unlikely, both switches are bad.

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If it's a blower motor, then the contacts on the relay is welded shut and has to be manually opened.

Coleman Evcon Furnace Error Codes


this will help you

can you remove thermostat from wall and ill tell you what to jump to check unit.

have you changed t-stat? if so you need to increase the heat anticipator. if you have a fan limit switch, the setting may need adjusting. Thay will change with age

Sounds like the flame sensor. But it could be the thermostat. Is the furnace standing pilot or electronic spark or hot surface ignition. I would start by checking thermostat. Turn power off to furnace take thermostat off wall and take wires marked r & w and connect them together. Turn power back on if furnace works then change out thermostat.Most eclectronic ignition Furnaces have a flam sensor, You could take flame sensor out and clean it up with steel wool or wire brush. If you need anymore help just reply back .

Is this furnace standing pilot or electronic ignition. If standing pilot i would check furnace filter then the thermastat. To test themostat first turn power off to furnace. Take thermostat off wall and take wires labled R & W and connect them together. If you have electronic ignition I would start with cleaning the flame sensor with steel wool or wire brush.If you have and more questions i will be glad to help.