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M heater comes on and gets hot but fan doesn't start blowing. I turn it down to make sure not to overheat the furnace. It has happened several times now and sometimes it will work for awhile then stops working again. It's an older furnace, I live in a 40 Year old mobile home and suspect it is the original furnace. Any ideas why my fan works one time but not the next?

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Usualy the fan absorb dust and dirt which located on its axis and support ball bearing and this making it more hard to rotate so some times rotate and some times is not. However if you are capapble you desasemeble the motor and clean the shaft axis and lubricated the ball bearings, if its is dificult for you, you can use a lubrican oil in between shaft axis and bearings this can help it run better.
The final solution is to replace the fan motor

Posted on Nov 06, 2010

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Posted on Jan 02, 2017

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This may need the furnace technician to repair.

I can locate the manual for your heater and the parts list but I cannot locate any reset button.

Blowers that run all the time have either a stuck fan relay or depending on age, have either a defective "fan control and limit switch" or a breaker that operates the fan. When the furnace ignites the fan waits until the air get hot before it blows. When the heat goes off, the fan continues to run until the furnace is cool.

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My Buick skylark doesn't leak but it over heats..


To troubleshoot this types of problem,click the link below :---

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I'm not sure whether this is a gas unit or not. With many gas heaters, the blower comes on when the heat exchanger gets hot enough and goes off once the heat exchanger cools. Other things are happening before the blower goes on. The blower is normally controlled by a "fan control thermostat". This stat actuates the blower when the furnace is hot enough so that cold air is not being blown around and allows the blower to run until the furnace cools enough to get out the remaining heat after the flame shuts off but not so long to again allow cool air to blow around. If this fan control is malfunctioning, you will get erratic runs from the blower or the blower may not run at all or run long or continuously. The fan control is the first thing to check.
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I have written a tip on this.
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1 Answer

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1 Answer

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