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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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Have you checked the thermocouple? It may be it is defective thereby shutting off the flow of gas.

Posted on Oct 09, 2010

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Check out the flame sensor see if it is clean and check the connections .

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I turn on my furnace and the coil warms up and then the igniter comes on producing flame but only for about two seconds and then it goes out and the furnace just winds up blowing out cold air, after about...


It sounds like your blower motor is not firing up for some reason. This could be a circuit board issue or simply a dead blower motor. What is happening is that the system is basically sensing that the heat is not being "blown" to the rest of the house and it shuts it self off to prevent damage. After the flame comes on you should hear another motor come on. Also, most furnace's have whats called an error led that will blink when the system shuts off. Each blink represents a different error. You will probably get something about high heat limit reached.

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Carrier Furnace infinity 96.model 58MVP060-F-18114. Furnace heats


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:(

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Blower stays on after heat goes off


when the room thermostat is satisfied it stops the heat by stopping power to the sequencer or contactor which is in series with the heating element/s...the TEMPERATURE OPERATED FAN SWITCH then takes over the blower until the heaters cool

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A 1979 Colman RV furnace. Blower shuts off shortly after burner shuts off leaving a hot heat exchanger. After 15 seconds blower comes on again blows for 10 seconds shuts off comes on in 15 seconds blows...


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.

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I have a comfort zone furnace. If it's 50 degrees in the house, and i set my thermostat to 70 or so,it takes at least 24 hours to reach 70 degrees. The furnace starts up and runs normally for about five...


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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1 Answer

Furnace runs OK, but blower runs again a few seconds later


Could be a defective thermostat in the plenum.
When a gas furnace shuts down the fan(blower) will run until the plenum cools to the safe range. Usually 1 and 1/2 minutes.
Intermittent operation is a defective thermostat or relay.

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