Mircowave works, exhaust door opens, fan stop working
Turn mircowave on to heat food. Heats up fine. Exhaust fan door open to vent but the fan does not come on, you can hear a humming or clicking noise in the background. When the fan is turned on via the circuit panel on the front, fan turns on and when the fan boost button is pushed it also blows out faster like it is suppose to do. What would cause the fan not to work under the normal use of the mircowave in use only?
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Re: Mircowave works, exhaust door opens, fan stop working
From looking at the owner's manual, it looks like the vent fan is only supposed to come on when the internal temperature of the microwave gets too high OR when you press the VENT FAN pad.
Here are a couple of fan-related excerpts from the owner's manual, which can be found here:
(or the better URL here: http://tinyurl.com/yn7r6g)
An automatic fan feature protects the microwave from too much heat rising from the cooktop below it. It automatically turns on if it senses too much heat.
If you have turned the fan on, you may find that you cannot turn it off. The fan will automatically turn off when the internal parts are cool. It may stay on for 30 minutes or more after the cooktop and microwave controls are turned off.
The vent fan removes steam and other vapors from surface cooking.
Press VENT FAN once for high fan speed, twice for medium fan speed, a third time for low faw speed, or a fourth time to turn the fan off.
Press the VENT FAN BOOST pad for extra fan speed.
Hope this helps.
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Exhaust fan motorIf
your exhaust fan motor is not running, there are a couple of things that
you can check involving the motor to locate the problem. After removing
the fan motor, you can manually attempt to turn the fan blades with
your hand. If the fan motor is working properly, the blades should spin
effortlessly. If this does not occur and the blades are taught, the
motor will need to be replaced. Secondly, the fan motor itself can burn
out due to time and usage. Using an ohm meter, the exhaust fan motor
should read open for continuity. If it does not, then the fan motor has
expired and will need to be replaced.
that could cause the microwave exhaust fan to not work is a faulty
thermostat. A thermostat gauges the air temperature, which activates the
exhaust fan when required. If this part becomes flawed, the exhaust fan
will not energize and the thermostat will need to be replaced.
Main control boardIf
your exhaust fan is still not working and the microwave fan motor,
wiring, and thermostat are operating accurately, the root cause could be
with the main control board. Replace the main control board.
That is normal for it to spin for about a second or so becuase of switch changeover but should not remain on constantly when door is open. Have it checked up if it does not happen like the way I described it.
i think you have a welded controller, either a digital one or a mechanical one. microwave won't run unless you switch it to run. the door switches are safety switches to turn off the microwave once you open the door. if you have a digital controller, you could have a welded relay, if you have a mechanical timer, it could be a welded contact at the timer. another thing is that it should heat what ever you are heating. if it is not heating, check if it has a fuse and if it is busted. some fuse are installed to protect only the magnetron that is why the light and turn table are still running. if there is no fuse to the magnetron, then check the diode from the capacitor to the ground. it could be open. if not then you can have a bad magnetron. i hope i was able to help.