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The most common issue with this symptom and unit is a stuck blower relay.
Once the unit is reached temp and the heat elements stop the blower is to shut down when unit cooled. In your case the switchis stuck resulting in continuous fan.
No biggy.The seat heater can be repaired by the dealership.Should not cost much because there are no parts just a reprogram of the drivers seat module.The blower motor is the blower motor resistor module.It is on the passengers side under the dash next to the blower motor.You should be able to do this yourself if you have a little mechanical experience.Hope this helps.Good luck.
you may need to replace the temp limited switch for the most part its close to the blower motor itself it has two small screws on each side with a plug in the middle give these websites a try www.autozone.com ane www.alldatadiy.com ifall fails stop by your local parts store and they be able to show you what ia ma talking about wish you the best of luck Michigan Man
This sounds like the high temperature switch has failed and is telling the unit to shut down after it gets started, the pilot has to be lit for the main gas valve to turn on when the thermostat calls for heat, The main burner comes on and stays on until the thermostat is satisfied and tells it to shut off, you dont say if there is a blower in this unit, if there is a blower after the main flame comes on the unit heats up it turns on the blower if equiped. If the blower fails to turn on the unit would be shut down on overtemp as the firebox would get to hot and be in danger of causeing a fire. if no blower there still is an overtemp switch that shuts the unit down if it gets to hot or the switch is bad, it could be a bad overtemp switch or if equiped a bad blower motor or even a plugged chimney as this would also cause a overheat ing condition. Hope This Helps Don
Is this a floor furnace? If so sounds like the switch for the blower, which is mounted on the side of the fire box is bad. There should be 2 of them, 1 for the blower to start 1 for the blower to stop when the fire box is cooled down. It wouldn't hurt to just replace both of them.
The humidifier should not turn on untill the furnace blower starts. Since the fan stays on. does the solenoid valve also stay on? If they both stay on you probably have a bad humidistat. If only the blower stays on then the circuit bourd in the humidifier is defective.