When I turn on the vent fan on my smh9187w I hear a popping noise and the fan just buzzes without any airflow, except on settings 4 and 5. I took off the grill and looked inside while turning on the fan and see that there is some sort of arcing happening in the back near the top. I'll assume this isn't normal. This is a continuation of a previous post where I suspected the PCB, but now I'm thinking it's more likely the vent motor. The unit vents out the back.
I had just replaced the control panel prior to this happening, and I can't figure out how these could be related. I'm starting to think they're coincidental. Microwave heats fine; all lights work. Do I need a new motor, or should I disassemble and find where the arc is happening? Thanks!
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Re: smh9187w vent fan popping noise
There are no bulletins covering a recurring issue with the exhaust fan on this model, so I would suspect the failing motor, an obstruction in the blades, a loose blade assembly, or a damaged wire arcing to the frame.
It will take some visual inspection with the oven removed from the wall (see your installation instructions) and the cover removed.
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Did this occur after a failure of your cooktop lights?
Or is there is buzzing noise present when the oven is not operating, or when the door is opened?
If so, then the
problem is on the control panel, which can be
There is a
YouTube 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.
happy to help you with free advice and we'd appreciate your thoughtful rating of
The loud buzzing you hear is the sound of the magnatron tube.That is what emits the microwave radiation and buzzing should be normal. The mag tube may be nearing its end at witch time you will hear no buzzing and hence no heating of foods. Replacement can be costly depending on the model so most people just opt for a new one. Hope this helps
Your microwave turning on by itself is a "self preservation feature" of the GE Profile Advantium and maybe some other models. Read the manual, When your over the range oven gets warm enough, for whatever reason the venting fan comes on until a satisfactory oven temperature is reached. You are not permitted to shut the vent fan off. Also it seems a temperature near room temp must be achieved before it shuts the fan motor off, it is very annoying. We had to return our Advantium because of fan noise. I configured the ovens vent fan to the recirculate direction because we do not have a vent duct that exits the house over our range. When the vent fan acting as the ovens cooling fan automatically turned on we would have to leave the house to hear each other talk. Too bad we really liked the oven other than that major problem. G-Man
My microwave was totally dead. Things I discovered:
1) There is an easily replacable fuse accessed by taking off the top front vent cover (two screws on top, gently massage off) and then the inside plastic grill. UNPLUG before doing this!
2) Pop off two wires on either end of fuse holder for safety. Then pop out fuse and replace.
For more extensive help, there is an evelope with a wiring diagram inside the case on the inside wall! Very helpful when diagnosing the surface lamp problem (I forgot to plug the ballast back in when I closed up the bottom).
Is it possible that grease or moisture got into the controls?
This can happen when cleaners are sprayed directly on the keypad; when boiling is done on the stovetop without the hood vent fan being on; when the hood vent filter is clogged; or due to restricted airflow in exhaust.
The best way to check the airflow is to turn the hood vent fan on and use your hand to feel at the exhaust outlet outside the home.
Moisture can cause the keypad or control board to short to some degreee, and produce odd results. It may clear up, but sometimes it requires that the keypad be replaced or that the board be professionaly cleaned.
If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
We also repair microwave control boards for customers nationwide for $39.95.
Feel free to contact me there directly if you have further questions.
From looking at the owner's manual, it looks like the vent fan is only supposed to come on when the internal temperature of the microwave gets too high OR when you press the VENT FAN pad.
Here are a couple of fan-related excerpts from the owner's manual, which can be found here:
(or the better URL here: http://tinyurl.com/yn7r6g)
An automatic fan feature protects the microwave from too much heat rising from the cooktop below it. It automatically turns on if it senses too much heat.
If you have turned the fan on, you may find that you cannot turn it off. The fan will automatically turn off when the internal parts are cool. It may stay on for 30 minutes or more after the cooktop and microwave controls are turned off.
The vent fan removes steam and other vapors from surface cooking.
Press VENT FAN once for high fan speed, twice for medium fan speed, a third time for low faw speed, or a fourth time to turn the fan off.
Press the VENT FAN BOOST pad for extra fan speed.
Hope this helps.