Question about Whirlpool GH7145XF Microwave Oven

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Frigidaire Microwave plmv169dcd Start Capacitor

Still attempting to get my hood vent fan to do more than hum by replacing the start capacitor.

I went to order the capacitor & all that was listed was the high voltage capacitor.

See below the parts list.
Looks like they show a hood capacitor (guessing that IS the start cap?), but they don't list it as a part.

P.s. do you know where it is on my microwave?

-Bob Mc

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The starting capacitor is used to start the hood vent fan motor. It's also called the hood capacitor.

On page 8 of the document you refer to above, on figure O-1, you will find the hood capacitor. It is shown on the control unit (circuit board). I've attached a snapshot of that area below.

Its leads connect to terminals A1 and A3. The hood fan red wire goes to A1, and the yellow wire goes to A3.

That part is not shown in this document as a separate part, so you will have to get it generically from an appliance parts store or electronics supplier, but you will have to order it by value.

You need to look on it and it will say something similar to this:
"7 uF 230V". In this example, that would be a 7 microfarad, 230 volt capacitor.

It's okay to get a capacitor with a little higher voltage rating, but not lower.

The capacitor, if truly bad, may not look bad. It can be quick-checked with an ohmmeter to see if it will charge and discharge (the meter will first indicate low resistance then go high to infinity). This is not a full-blown test, but for this kind of capacitor it may be enough.

You should check the solder connections, also. It's a large part, and sometimes they don't get enough solder on them. The connection may be cracked and just need to be resoldered.

Since a new thread was started, it makes it harder to follow along the saga...

But this problem could be a bad (or jammed or obstructed) hood fan motor, a flaky relay on the control board, a bad cap, or bad wiring.

Frigidaire Microwave plmv169dcd Start Capacitor - 2663d59.jpg
Microwave hood fan motor starting capacitors usually look something like this, and may be red, blue, green, orange, etc.


Posted on Dec 05, 2007


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1 Answer

Control Board wiring

How old is the unit. normally there is a tech mini manual of one or more pages inside the control panel or you might look in the upper vent area. this wiring / schematic would list the wiring positions of the relays you mentioned.

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Microwave oven makes a load humming noise & it made a loud pop noise

It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

Dec 27, 2010 | Frigidaire PLMV169DC Microwave Oven

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Needs new exhaust fan start capacitor

The motor run capacitor for this model (C100 on the power board) is a 7uF 230V type and the part number is RC-QZB014MRE0.

You can order parts from Encompass here or you can call them toll-free at 866-779-5835.

Or a local appliance parts store may have that one or one close enough to work, as long as it's rated at 230V or greater and about 7uF (microfarads).

It may not be a bad capacitor, it may just be a bad solder connection at the capacitor, or possibly at the relay that runs the hood fan (RY6) or the connector CN-A.

Lastly, the bearings in the motor may be dry or dusty.

I would check the connections on the control board first.

We have the service / repair manual for this model and have uploaded it to our site here for free download to help you.

It will give you safety info, step by step help in disassembly, and troubleshooting tips, but it does not show the capacitor part number.

Since this is made for Frigidaire/Electrolux by Sharp, I got it from another Sharp manual. This capacitor is used in several Sharp models.

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

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1 Answer

Control panel went off and hence it stopped working

It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel or between the door switches.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

When checking TCOs or thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

If the cavity thermostat needs to be checked or replaced you'll need to pull the oven from the wall.

You can download Frigidaire / Whirlpool installation instructions here.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

There should also 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.

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

Nov 26, 2008 | Frigidaire PLMV169DC Microwave Oven

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is the turntable working

Dec 29, 2007 | Microwave Ovens

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"Starting Capacitor"

I just posted an exhaustive answer to this on another new thread you just started. This makes thread number five on this issue.


Dec 04, 2007 | Whirlpool MH1150XMQ Microwave Oven

1 Answer

Starting Capacitor

Found this Frigidaire question posted under Whirlpool but I'll be happy to answer just the same.

The starting capacitor is connected to the line level voltage, as opposed to the high-voltage capacitor evryone warns about.

The starting cap doesn't store enough of a charge to worry about.

The main thing is to be sure the oven is disconnected from the power line. I prefer unplugging it, but some installations make that hard, so you need to turn off the breaker.

Hood fan failure can happen due to many causes:

If a cooktop light bulb blows or is removed or installed while the oven is still connected to the power line, that can damage the circuit board in the area.

The hood fan motor wiring can short.

The starting capacitor can be bad.

There may be dust, hair, debris, etc. in the bearings of the hood fan motor jamming it. The filters are supposed ot help prevent this, but things happen.

Behind the control panel on Whirlpools is a very helpful mini-manual that can help you check and diagnose quite a few problems with these.

On some brands it's located on the control circuit board, in others it's mounted on or in the hood fan assembly.

If you post your brand and model we can probably steere you better on a mini-manual and the capacitor.

Dec 03, 2007 | Whirlpool MH1150XMQ Microwave Oven

1 Answer

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:

We have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa:

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.

Nov 30, 2007 | Whirlpool MH1150XMQ Microwave Oven

2 Answers

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

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

Nov 30, 2007 | Whirlpool MH1150XMQ Microwave Oven

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.

Nov 30, 2007 | Whirlpool MH1150XMQ Microwave Oven

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