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Janitrol furnance blower motor shuts off when AC unit is running. LED is flashing short to ground If you place the thermostat in the fan on position it runs fine, but constantly

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Sounds like your control board is shorted.Without actually checking the unit this is a guess.

Posted on Sep 23, 2008

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Furnance running all the time never shuts off


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The fan motor is on all the time with the controls shut off. I have to shut the unit off with the main breaker. The ac works but again the fan never shuts off. On the circuit board the LED flashes 8 times,...


The indoor fan or the outdoor fan? If it is the indoor fan the thermostat may be wired incorrectly or shorted. If the red wire and green wire in your thermostat maintain contact, the indoor fan will run all the time.

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I have a Johnson aire ease ultra 90 gas furnance. I also have a outdoor wood furnance that has its own thermostat. On the original thermostat I turn the blower in the on position. I then set the outdoor...


I would first eliminate one furnace from the equation, the exterior wood furnace... turn its tstat down. Will the gas furnace then operate normally? Can you run the blower manually, as in summer mode? Make sure your filters are clean also... that can sometimes overload the blower.

Apr 12, 2017 | Heating & Cooling

1 Answer

Have a Janitrol central air system and the unit outside comes on but the fan in attic does not always come on. If I go to the thermostat and manually turn it from auto to on it comes on. Any ideas about...


If the blower is working with the thermostat in the ON position that tells you that the fan motor works. In the AUTO setting... the system in controlled by the contacts in the thermostat. 1. The thermostat contacts might not be closing. 2. A contactor( or relay ) in the air handler unit(inside unit) might not be closing to send the signal to the fan motor. It sounds like a thermostat or relay problem to me. You can email me at Starztruck4u@aol.com if you have more questions.

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Try this, disconnect the fanwire (green) on the furnace, if it shuts off then the hot wire from the thermostat is touching the green wire or bad thermostat. Thank-you-very-much!

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