Question about Whirlpool MH1150XMQ Microwave Oven

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Frigidaire PLMV169CD Micowave Hood Vent fan Hums, but won't run

posted by BOB MC on Nov 30, 2007 Report abuse Wasn't sure how to "REPLY" to the below problem & potential solution: First of all, YES, it is the hood fan that I already replaced with no difference. Next, just making sure you realize it is a Frigidaire, not Whirlpool. See below for my comment asking how to get to that "Big starting capacitor"...

Just (attempted) to fix my exaust fan inside my microwave by replacing it.

No dice.
Same thing still happens.
Can hear a humming sound & can actually get the fan to start ( w/ microwave apart) if I give it a little help spinning.

?Is theresome sort of switch that may be n/g?
If so, where?
?Part #

Thanks!
Bob Mc
Comment by BOB MC, posted on Nov 30, 2007 RE: "I would suggest you check the big starting capacitor on the circuit board and the connections on that cap.

How to get to the capacitor?

& since I have no way of actually "Checking" it other than visually, is there an actual part I can replace?
p.s. It is not a Whirlpool, it is a Frigidaire PLMV169cd Microwave.

Do they happen to have that hidden manual as well?

Thanks Again!

-Bob Mc

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Try our Premium Assistance plan Solution #1 posted on Nov 30, 2007
By MicrowaveSvc
Rank: Guru
Rating: 87%, 1118 votes

Do you mean the hood vent fan? (That would be a large assembly a little smnaller than a loaf of bread, I guess)

If it's this one, I would suggest you check the big starting capacitor on the circuit board and the connections on that cap.

Or do you mean the cooling fan inside, which would be small enough to basically fit in your hand?

In either case, I would measure the line voltage to be sure it's in the 110-125VAC range.

If it's grossly outside this range, you may have a problem with other electronics or light bulbs bblowing or being dim or erratic.

One handy thing about Whirlpools is that behind the control panel they have a mini-manual which is very useful in troubleshooting

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  • BOB MC Nov 30, 2007

    How can I get to the capacitor?



    -Bob Mc

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The starting capacitor will be on the circuit board. It is a non-polarized capacitor (maybe polystyrene?) so polarity is not an issue in this case.

You need to remove the control panel to see it.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

We have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk

I am beginning to suspect that you have a failing relay on the control cirucit board. It may have gotten carbo deposits on the contacts, reducxing the conductivity. This means less current flow and reduced or non-existent fan action.

After you've checked all this, feel free to contact me about a possible repair. We could have you send us the control panel assembly and the new hood fan so we can analyze and repair it. he second link above takes you to our site.

Posted on Dec 01, 2007

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If you have an old analog multimeter, you can put it across the motor start capacitor and the needle should deflect to low ohms position then ramp up to the open or infinite ohms position. You can remove it and test it the same way. Also, doing this test should store a dc voltage on the leads which can then be read even with a digital multimeter. I have even used an audio output from a cheap amplifier to determine if audio is transmitted from one lead to another. The capacitor works by shifting the starting current by 90 degrees and the motor acts as you say it does if the cap is bad. Make sure you orient the cap properly with the positive and negative terminals in the proper holes

Posted on Nov 30, 2007

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MicrowaveSvc
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SOURCE: Frigidaire PLMV169cd Microwave Exaust Fan Hums but wont run

Do you mean the hood vent fan? (That would be a large assembly a little smnaller than a loaf of bread, I guess)

If it's this one, I would suggest you check the big starting capacitor on the circuit board and the connections on that cap.

Or do you mean the cooling fan inside, which would be small enough to basically fit in your hand?

In either case, I would measure the line voltage to be sure it's in the 110-125VAC range.

If it's grossly outside this range, you may have a problem with other electronics or light bulbs bblowing or being dim or erratic.

One handy thing about Whirlpools is that behind the control panel they have a mini-manual which is very useful in troubleshooting.

It may be that you have some toruble on your control board, which we repair for customers nationwide.

Please write back with more details if you need further help.

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

Posted on Nov 30, 2007

MicrowaveSvc
  • 9098 Answers

SOURCE: Frigidaire PLMV169CD Micowave Hood Vent fan Hums but won't run

.
The starting capacitor will be on the circuit board. You need to remove the control panel to see it.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

We have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk

I am beginning to suspect that you have a failing relay on the control cirucit board. It may have arced and gotten carbon deposits on the contacts, reducing the conductivity. This means less current flow and reduced or non-existent fan action.

After you've checked all this, feel free to contact me about a possible repair. We could have you send us the control panel assembly and the new hood fan so we can analyze and repair it. The second link above takes you to our site.

Posted on Dec 01, 2007

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2663d59.jpg
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fff8e8a.jpg

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Frigidaire PLMV169CD Micowave Hood Vent fan Hums but won't run


.
The starting capacitor will be on the circuit board. You need to remove the control panel to see it.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

We have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk

I am beginning to suspect that you have a failing relay on the control cirucit board. It may have arced and gotten carbon deposits on the contacts, reducing the conductivity. This means less current flow and reduced or non-existent fan action.

After you've checked all this, feel free to contact me about a possible repair. We could have you send us the control panel assembly and the new hood fan so we can analyze and repair it. The second link above takes you to our site.

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1 Answer

Frigidaire PLMV169cd Microwave Exaust Fan Hums but wont run


Do you mean the hood vent fan? (That would be a large assembly a little smnaller than a loaf of bread, I guess)

If it's this one, I would suggest you check the big starting capacitor on the circuit board and the connections on that cap.

Or do you mean the cooling fan inside, which would be small enough to basically fit in your hand?

In either case, I would measure the line voltage to be sure it's in the 110-125VAC range.

If it's grossly outside this range, you may have a problem with other electronics or light bulbs bblowing or being dim or erratic.

One handy thing about Whirlpools is that behind the control panel they have a mini-manual which is very useful in troubleshooting.

It may be that you have some toruble on your control board, which we repair for customers nationwide.

Please write back with more details if you need further help.

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

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