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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.
ThermostatAnother part
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.
To allow us to help you effectively (at no charge), please post a NEW problem to FixYa, and please
include your brand name and the full model number from the tag in or on
the unit, your symptoms ("my maytag microwaves fan stays on, i broke the bottom latch and glued it back on, still stays on'"), as well as the answers to these questions:
Which fan is it, the internal
cooling fan, which comes on automatically whenever the unit is
microwaving?
Or the hood vent exhaust fan which you can turn on and off
manually?
You are correct the fan motor is either stuck or needs replaced.
There is no way to do this without removing the entire microwave. In case your not familiar with how microwaves work, there is a capacitor that is very large inside and can hold a charge even after it is unplugged for up to 24 hours, please take action to prevent getting shocked.
You probably have either a shorted base thermostat on the base of the chassis of the oven or a shorted fan relay on the control circuit board.
There
should be a "mini-manual" (tech sheet) hidden inside the unit
behind the
control panel or hidden on the left side behind the grille, which is
very helpful when troubleshooting, testing, and locating
components.
At
our Web site, we have a video
available showing how to remove a typical
over the range control panel assembly in under 5 minutes.
You can find
helpful exploded view diagrams and order parts by entering your full
model number from the tag on the oven here.
We have
the service / repair manual for this model and have uploaded
it to our
site here for free download to help you.
The base thermostat (which I believe has thinner pink and yellow wires attached, but not thicker black wires) should read normally open. If it shows continuity (virtually zero ohms or shorted) then it is bad.
Otherwise, I would say you have a shorted fan relay on the control circuit board.
We regularly repair such control
units for
customers nationwide by mail for $39.95 postpaid in about a
week or so with a one-year guarantee.
Feel free to contact me directly (and please remind me of your
full model number from the tag on the unit) for more
information & help.
We're
happy to help you with free advice and we'd appreciate your thoughtful
rating of our answer.
the fan may be clean, may be fan bush struck thats why fan running not properly, check the internally inside the microwave oven , you should carefull inside micro wave oven very high voltage .
it keeps running venting from the top
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