Question about Whirlpool MH3184XP Microwave Oven

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Fan motor runs at low speed when fan turned off

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  • Whirlpool Master
  • 9,047 Answers

Is it stuck on the low speed when it should be running at the high speed?

Is it coming on when it should not?

Have the cooktop lights failed recently?

If so, then the circuit board may have been damaged. We repair those.

Or it may be a bad door switch or mount.

But to know for sure, we'd need your brand and model number and more specific details on how it's failing.

Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) for more free 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
prototech@usa.net
http://www.microwavedisplay.com
Microwave Oven Control Panel Repair Nationwide

Posted on May 06, 2010

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1 Answer

Whirlpool microwave fan not working


I would unplug the oven for 2 minutes to do a hard reset and try it again, just in cause there was a glitch.

Without knowing your full model number from the tag on the oven, I would wonder if it has a separate internal cooling fan from the hood vent exhaust fan. It could be an unrelated issue.

For more free DIY and other help & advice, feel free to contact me with your full model number and FCC ID number from the tag on your oven.

William E. Miller, AS-EET
pupista@gmail.com
http://www.microwavecontrol.com
Microwave Oven Control Panel Repair Nationwide
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Exhaust Fan Motor


If the exhaust fan does not run the fan motor might be bad. Remove the fan motor from the microwave oven and see if the blades can be turned by hand. They should turn very freely, if they're stiff the fan motor will need to be replaced. The fan motor can also burn out. To test this use an Ohm meter. The motor should have continuity. If it doesn't, replace it.
Thermostat


If the microwave exhaust fan is not working the thermostat might be defective. The thermostat senses the air temperature and turns on the fan as needed, if it's defective it won't turn on the fan. Watch our video on testing thermostats.
Main Control Board


If the microwave exhaust fan is not working check the exhaust fan motor and wiring. If they are good the main control board might be defective.1_24_2013_5_50_54_pm.gif1_24_2013_5_53_00_pm.jpg

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We have a kenmore ultra wave microwave and the fan has stopped working and now the microwave won't operate. Any suggestions?


see this causes and fix it .God bless you
Exhaust Fan Motor If the exhaust fan does not run the fan motor might be bad. Remove the fan motor from the microwave oven and see if the blades can be turned by hand. They should turn very freely, if they're stiff the fan motor will need to be replaced. The fan motor can also burn out. To test this use an Ohm meter. The motor should have continuity. If it does
Thermostat If the microwave exhaust fan is not working the thermostat might be defective. The thermostat senses the air temperature and turns on the fan as needed, if it's defective it won't turn on the fan. Watch our video on testing thermostats.

Main Control Board If the microwave exhaust fan is not working check the exhaust fan motor and wiring. If they are good the main control board might be defective.


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Oct 02, 2012 | Microwave Ovens

1 Answer

The exhaust fan is not working. When you turn it


If it is running but running slow you may be able to save the fan motor that you have. I am assuming this is a counter top microwave.

First off... make that dreaded trip to your nearest appliance parts supply and buy a "Zoom Spout" oilier (Usually under $3.00)

Next (unit un-plugged) remove the 6 screws in the back of chassis cover and the 4 screws on the side.
Begin lifting the cover up to about 15 deg and pull toward the rear of the microwave so the cover unlatches. Once unlatched lift off the cover.

IMPORTANT:

Use a flat bladed screwdriver that your holding way back on the handle and ground the large capacitor at least 3 times across both terminals. It may make a POP but not to worry... that is normal and your making the unit safe to work around.

Now get a paper towel and lift the fan blade with your hand gently until it just lifts briefly. Wipe off the dirt from the fan motor shaft. Underneath the fan motor use a Q tip to remove the dirt from the armature shaft.

Pull the tube out about 3 inches from the Zoom Spout Oiler (under the red cap) Lubricate the fan motor bearings upper and lower from above the bearing. It is ok to over oil just make sure you spin the fan blade by hand then lift the fan blade up and down... use the paper towel to clean up the dirt. Re-oil again to flush dirt. repeat the lifting up and down of the fan blade (full travel 1/8" or less) and wipe once again. Once your sure the bearing mating surfaces are clean and the excess oil has been cleaned up test the microwave with the cover off. Just be advised the HV capacitor is now recharged so avoid reaching into any area where there are exposed contacts. It can really ruin your day.
After your sure the fan is at full speed then re-install the cover assy by holding it over the unit with the rear elevated at a 15 deg angle... Ease the cover forward guiding the side locking tabs into the front of the chassis. Lower the cover and install all 10 screws. 4 on the side and 6 on the back.

That should do it. If not the only other option is fan motor replacement. If you determine that you need a fan motor respond with the model number and I can assist you in finding the replacement parts on-line or ;the part number so you can buy it locally at an appliance parts supply source.

Thanks for using FixYa.

Kelly



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Decor DMT2420S - fan speed very low


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1 Answer

Fans do not work properly


If the hood fan is not working at all, it would be due to a bad connection or other problem on the control panel (circuit board) or an open thermal or winding in the hood fan motor.

If you or a friend want to troublesoot this, I can give you some tips.

We have critical safety and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk

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1 Answer

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