Question about Frigidaire FMV157GM Microwave Oven

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Needs new exhaust fan start capacitor - Frigidaire FMV157GM Microwave Oven

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  • pastormar51 Jul 25, 2009

    Frigidaire fmv156dcc hood exhaust fan does not come on when button is pushed. It does start if you spin it.If it is not reasonable to repair I was thinking of disconnecting the fan motor and putting an in line fan in the duct with a wall switch.

  • William Miller
    William Miller May 11, 2010

    Please reply back with your brand and model number so we can help you.

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  • Frigidaire Master
  • 9,098 Answers

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.

Posted on Jul 26, 2009

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  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.
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  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.
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Frigidaire Microwave plmv169dcd Start Capacitor


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.

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Microwave hood fan motor starting capacitors usually look something like this, and may be red, blue, green, orange, etc.

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

See: http://www.fixya.com/support/t283240-frigidaire_microwave_plmv169dcd_start

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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.
dfbb857.jpg

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