Question about Frigidaire FMV145K Microwave Oven

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Exhaust vent won't turn off

I have a similar unit..the FMV145KF3. The exhaust vent turned on all by itself and will not turn off. When I press the power button, I can turn the fan to high, to low, and then press the power off, the display says the fan is off, but the fan is still on the low setting. I even shut off the power to the microwave, but when the power is restored, the fan turns right back on. Any ideas???

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  • 9,047 Answers

I've found information on models FMV145KB3 and FMV145KS3 but not FMV145KF3, but this should still apply.

This will be either a shorted hood vent thermostat on the floor of the chassis of the oven, or a shorted triac or 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.

exhaust vent won't turn off - d:%5cele%5crepair%5cmicrowave%5cge_hotpoint%5cmini_manual_behind_grille_small.jpgAt our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

If it's a thermostat, you should be able to get it
here.

If the thermostat is good (reads open) then the problem will be 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) 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
prototech@usa.net
http://www.microwavedisplay.com

Posted on May 20, 2009

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1 Answer

We changed the charcoal filter & reset it. The vent fan still does not run. I cannot turn the vent on by pressing the vent button but the micro still heats up. What happened to the fan?


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

Sep 30, 2013 | Whirlpool WMH2175XVB Microwave Oven

1 Answer

Exhaust Fan Turns on by itself and will not shut off


Your hood TCO may be shorted. It should read normally open.

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.

e6f5886.jpg

You can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites.Or if you've recently had a blown cooktop light, it may have damaged your fan control on the circuit board.

We see (and repair) this a lot. The problem is on the control panel, which we regularly repair nationwide by mail for $39.95 postpaid in about a week or so.

At our Web site, you can get details of our service, plus we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

The lights can can be inoperable or stuck on or stuck in "night light" mode. Sometimes this will similarly affect the fan operation or inside light, too.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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It could be that the fan button is sticking or a contact has welded itself closed therefore its getting power all the time.

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The HMV9305 has an automatic vent turn-on feature. It senses heat, possibly from the oven or range beneath, and turns on the exhaust fan until temps return to normal. Sometimes this may take 4-5 minutes, which can seem like an eternity of listening to the blower run, but it is a safety feature designed to prevent damage to the microwave from excessive heat generated by the cooktop or oven beneath it.

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Sharp Microwave Oven over stove fan goes on by itself


Please note that FixYa is not currently notifying us Experts when Clarification Requests are answered.

So please post a
NEW question, and please include your brand name and the full model number from the tag in or on the unit, 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?

Or the convection fan, if it is a convection model?

When is it coming on?

Is it coming on whenever you cook on the stove top?

Thanks!

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Exhaust fan doesn't work and blows air from top vent


Some microwaves have a adjustable fan. We have one that you can vent out the back, the back top or through the front top filters. The latter is what it sounds like you have. If you take the small back panel off and lift out the fan motor you'll see that you can place it in the direction you like.\\

KK

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I replaced the bulbs in the underside of the microwave but the lights still won't turn on, can someone tell me what i'm doing wrong or something else I need to do? It's a whirlpool model # MH6130XEB-1...


We see (and repair) this a lot. The problem is on the control panel, which we regularly repair nationwide by mail for $39.95 postpaid in about a week.

At our Web site, you can get details of our service, plus we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

The lights fan can be inoperable or stuck on or no bright, too. Sometimes this will similarly affect the exhaust fan operation, too.

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
prototech@usa.net
http://www.microwavedisplay.com

1920d6a.jpg

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the vent tube in back may not have been changed over they can be vented or ventless but you must switch the flap in back you had the answer in your question ... good job,,..lol

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Whirlpool customer service is here and you can also enter your model number on that page to download your owner's manual, installation instructions, etc..

The installation instructions are what you need.

We're happy to help you and we'd appreciate your thoughtful rating of our answer.

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