I have a Patriot 80 plus furnace that has just had the Emerson blower motor PN 47465-001 replaced with a like item MARS #03463 blower motor.. the blower works great but just does not shut off.... the white,black and blue wires are connected to the same colors to the becket burner and the two brown wires are connected the the same positions on the capacitor all just as the original blower motor.
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It depends....on if you are talking about a small blower in the front of the furnace or the indoor fan motor. If your furnace is an 80% effficiency rating or above it will have a 'combustion air' fan....that will be a small on in front of the furnace in the vestibule under the front cover. If you have that motor and that is the one you are asking about...then YES it has to be running prior to the furnace igniting the gas.
If you are talking about the indoor fan motor for circulating air into your ducts, then NO it does not have to be running in order for the furnace to ignite. But it WILL have to run to remove the heat from the heat exchanger after it ignites or it willl overheat and shut off on high limit.
Hello, it could be shutting down on it's high limit switch due to a dirty air filter, dirty blower wheel, weak blower motor. Usually this would cause the furnace to shut down before it reaches the desired temp.
That could be a couple of things....
Open up the bottom cover and take the wire off of the "G" terminal that goes to the t-stat...then replace the cover and see if the blower still runs...
If it runs then the problem is intenal to the furnace, probably the integrated control board or a high limit is tripped...
If that stops the blower from running then you have a bad relay in the t-stat ora shorted wire going to the t-stat.
In the path of the flame on the last burner that starts, there will be a small rod. That rod is the flame sensor. Take a scrub pad and polish it. Also check the electrical connection that goes back to the circuit board. Disconnect any ground wire from the circuit board to furnace cabinet, sand it and replace it.
Usually when the furnace blower motor runs all the time
The limit switch or rollout switch is usually open or bad.
The furnace board is seeing that one of those switches is open, so it brings the blower on to try to get the heat out of the combustion chamber area, so the switch will close. But if the switch is bad and won’t close, the furnace board will keep the blower running continuously.
Yes. If the high limit is tripped, the furnace will bring on the fan continuously until the limit resets. Often, they will not reset if tripped repeatedly. If the furnace is too large for your application, you probably are not able to move enough air to keep the heat exchanger cool enough.