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Furnace calls for heat. furnace goes on blower stays on for 1 minute shuts off and has not reached temp. after another minute blowers go on and again shut off. during the intermediate time you can feel heat from blower.
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Motor might be bad and shutting down on thermal protection. Is this a direct drive or belt driven ? .if belt driven try adjusting the belt tension or just replaced the motor
Sounds like the blower motor is getting hot and cycling on internal motor overload. Probably airflow or the blower bearing or capacitor. Turn off all power to the unit then you need to check the filter, Evaporator coil to see if air is getting through it. When checking the coil for a blockage you need to remove a side plate, it's triangular and check the entering air side of the coil to see if its blocked. You need a volt ohm meter with a micro-farad scale to check the blower capacitor and motor amps. You could have a bad motor bearing.
Sounds like it could be your fan limit switch. Part costs about 20 bucks and is fairly simple to replace. This limit switch is a safety that prevents your furnace from over heating. Usually when your t/s is satisfied the blower runs for a little longer after the burners have stopped, and the reason for that is the limit switch. The blower is supposed to cool this limit switch to a certain temp. and once it reaches this temp it shuts the blower off. Yours is stuck:(
The fan limiting switch is acting up. It should stay running until lower temp is reached. It will cycle until the temp stays below or at the low setting. Limit switches are adjustable.
When the thermostat calls for heat it should run until the room reaches the temperature setting then shut off. Is the blower motor running and can you feel air coming out of the vents? It sounds like the blower is either not running or putting out enough air to keep the furnace heating. The blower moves the heat from the heat exchanger to the room, if it can't remove enough heat from the heat exchanger there is a limit switch that will shut the burner off if it gets to hot and that's what it sounds like is happening.
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