Exhaust fan is running constantly, without even

follow this steps and fix iT. God bless you

1. 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.
   
2. 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.
   
3. 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.
   

Read more: http://www.appliancepartspros.com/repair-help/microwave-repair-help.html#12#ixzz2gURd1VtM
http://www.appliancepartspros.com

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101
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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?

I have a MMV1153BAB. My service tech mentioned that if use of the surface units overheat the microwave, the microwave fan will come on automatically.

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.

> MMV5165BAB hood vent fan runs continuously

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.

William E. Miller, AS-EET
[email protected]
http://www.microwavedisplay.com
Microwave Oven Control Panel Repair Nationwide

beeping how to mute

The issue is that the fan on that unit is a reconfigurable fan. If there is a vent, you install the fan one way, if there is no vent pipe to the outside, you install the fan another way. https://www.manualslib.com/manual/294916/Maytag-Mmv4205.html?page=9#manual

check the control unit and high voltage circuit, and megnetron, high voltage diodes, wiring and high voltage fuse etc.,

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 .