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Whirlpool velos microwave, model gh208xrs-1, accidently touched the hot wire from the rotation motor to ground and lost power is there a blown fuse somewhere /

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: Whirlpool Velos Microwave showing "Error

F7 means that the control panel is not getting feedback from the Switched Mode Power Supply (high-voltage inverter).

This could be due to a problem with the inverter or the control unit / circuit board, but it appears to be the latter in most cases.

We repair microwave control boards for customers nationwide with our guaranteed $39.95 service.

We have full details, plus critical safety, disassembly, and troubleshooting info at our site. You'll find a link to our site in our listing here on FixYa:

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful.

You may reply back with your brand and model number if you'd like us to look into this further, or feel free to contact me directly if you need more help.

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

William E. Miller, AS-EET

Posted on Jun 29, 2008

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SOURCE: GE Spacemaker Microwave Blown Fuse replaced still no power

If you measure across the varistor leads with it still in the circuit, you should measure around 100-300 ohms, which is the DC resistance of the primary of the low voltage transformer.

If you read infinity / open the primary of the low voltage transformer is bad.

If the varistor is bad, it will be shorted and usually it will be cracked or split. This is a much simpler way to test the varistor.

Have you checked the magnetron thermal cutout (TCO) (or thermostat if so equipped) and the oven TCO? These are the leading causes of a dead GE when the fuse is okay.

You didn't mention the model number. What is it?

Please reply back here if you still need help.

We're happy to help you. Once we have all your information and offer a final solution, we'd appreciate your thoughtful rating of our answer.

Posted on Jul 18, 2008

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SOURCE: Microwave stopped working while cooking. Is there a fuse?

If unit is built-in reove screws holding unit to cabinet.
Slide out about 2 inches to access 3 screws holding grill.
Remove grill to get to two screws holding control panel.
Fuse is behind control panel,

Posted on Mar 17, 2009

  • 19396 Answers

SOURCE: whirlpool velos model gh7208xrs-1 will start but it does not make

Check contacts to control board first.

If control board is OK then test the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.

Thediode and capacitors can br tested. The capacitor must bealloweddischarge before testing, or you risk to get electrocuted, evenifpower is off. Capacitors can get discharged by shorting theirtwocontacts.
Before replacing the magnetron test also the control board.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts.

Posted on Apr 27, 2009

  • 43501 Answers

SOURCE: Whirlpool MH7140XFQ-1 microwave no longer heating

Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips


Posted on Sep 30, 2010

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I have to slam the door very hard for it to close correctly what would cause this problem?

Incorrectly adjusted door catch. They have movement on them to allow a tight seal due to the microwave capability.

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I have a Whirlpool microwave oven model number m T 7 118 xD Q all the other buttons work but when you push the start button it does not work can you tell me what the problem is?

There is a fuse inside your microwave that might have blown. Take cover off unit unplugged make sure unit is grounded. Remove blown fuse. This should fix problem. Also check that the door is closing all the way. Put pressure on door and see if it starts.

Feb 01, 2015 | Whirlpool Microwave Ovens

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I have a Whirlpool undercounter microwave that doesn't start cooking till 1minute off the counter is gone by then woks properly or hit the power ranger and start at 10 % and go thru to 100% ???? T

follow the next step, use the common sense, God bless you

1. No power to outlet (overload or fault in microwave or other appliance).
2. Blown main fuse - likely due to other problems.
3. Open thermal protector or thermal fuse.microfuse.jpg
4. Defective controller or its power supply.
5. Clock needs to be set before other functions will operate (some models).
Tight any connector. see the picture.

Aug 03, 2012 | Microwave Ovens

1 Answer

I have a Samsung SMH7177STE/BE I accidently hit the start button in stead of the timer for 30 min. When I went back into the kitchen the microwave was turned off. Thought maybe my outside curcit blew. I...

It may have tripped a high limit switch and less likely but possible it blew the fuse. A fuse blows due to an increase in amperage or a short. There is the possibility it melted components such as the door switches or a wire due to heating the cavity. Door switches pop fuses when shorted or the door doesn't engage them properly.
As most microwaves other than Panasonics contain capacitors you must be very cautious even when unplugged to avoid shock. 2100-4000 volt capacitor on the high side.
So where to begin is unplug the unit. Attach a wire to something grounded to bare metal on the machine. Open it. Look for burnt wires or components without touching anything. Discharge the capacitor using an insulated screw driver or tool (short the leads). Test the fuse using ohms Check the high limits (black disks the size of a penny) by testing across them using ohms. If the fuse is blown check out the door switches, some are closed with the door shut and others are the opposite. So test each switch in both door positions. Test the light wires to ground. Should read open. Test ohms on the whipper motor and fan and to ground as well. Reads measurable over the motor leads and open to ground. Test the capacitor using uF and compare to rating on the capacitor (be sure its discharged). Disconnect the magnetron. Test each lead to ground. It should be open. Its highly unlikely its the transformer or a computer board so i wont go into detail about testing those components.

Jan 20, 2011 | Samsung SMH7178STD Microwave Oven

1 Answer

Have a Kenmore 721.67680790 lost all power is there a fuse somewhere?

Microwave ovens have both electrical and thermal fuses. The former are usually cylindrical (1/4" x 1 1/4" or 5 mm x 20 mm) and mounted in a clip-type holder. The latter are either rectangular ceramic blocks about the same size as an electrical fuse, or metal and plastic cans about 9/16" in diameter with blade-type electrical terminals on top and a diamond-shaped metal mounting plate on the bottom. They are usually mounted on or near the magnetron or on top of the oven cavity.

Electrical fuse
Do not test by replacement; use an ohmmeter or continuity tester to check the fuse.

If the electrical fuse is blown, check the high-voltage capacitor behind the big transformer for a short circuit. Caution: discharge it through a large resistor before touching the terminals with your fingers or an instrument other than a high-voltage probe. If you see a spark when you touch the discharge lead to the capacitor, you can stop that test; the capacitor is NOT shorted, although it's internal safety discharge resistor may be open. If you don't see a spark, set your digital multimeter to its highest DC voltage range and confirm that the capacitor is discharge, then set it to resistance to check for a short. A good capacitor will have a constantly increasing resistance reading until it finally settles on a number above 1 million ohms (internal discharge resistor); a bad one will quickly settle on a very low value. (A continuity tester may give a brief indication of continuity as the capacitor starts to charge, then show "open".)

Inspect the door switches to make sure they aren't broken or burned. I've seen them literally fall apart - the contacts start going bad, get hot, deteriorate further and eventually cause the plastic case of the switch to fail. Usually you have trouble getting the oven to work properly when this happens, but it's possible the first sign of failure is a short to ground from a terminal that fell off the switch, and a blown fuse. Inspect the rest of the wiring for anomalies as well. If you can't find any shorts to ground or across the power line (don't be fooled by the low resistance of the controller transformer), then you can try replacing the fuse.

Thermal fuse
Again, use an ohmmeter or continuity tester to check these. Thermal fuses can go out simply because the oven got over-worked in a hot environment, especially if the cooling vents were blocked or the fan is not turning fast enough. Clean the vents and magnetron fins if necessary, and make sure the fan spins freely and easily.

Dec 06, 2010 | Kenmore Microwave Ovens

1 Answer

I have a Samsung microwave model SMH7177STE/BE. Will only heat a few minutes before and shut off, now there is no heat. I am a licensed elect. but no experience with microwaves and having difficulty...

Its tripping a high limit most likely. Be careful there is 2100 to 4000 volt high side with a capacitor if its not an inverter. The standard components consist of noise board, fuse, touch panel and power controller, high limits, door switches, whipper motor, fan, transformer, capacitor, transformer, magnetron, diode, plate rotator.
Discharge cap (for safety and further testing).. Test fuse; if fuse tests blown test door switches first. Test limits. Check amp draw with slow blow fuse; open door to stop unit and again discharge capacitor. Test resistance to ground on whipper, fan, magnetron, light. Test resistance lead to lead (measurable on motors/coils/magnetron). Test capacitor in ferrads, compare to spec on print. Check diode forward and reverse. Test output voltage from power control board to transformer. Test transformer coils.
Best of luck and play safe; dont test voltage output from the transformer, voltage at capacitor or magnetron.

Aug 03, 2010 | Samsung Microwave Ovens

1 Answer

I have Whirlpool Microwave oven Model MH6110XEB-0 that has completely loss power. The outlet it is plug itno is still good with power running thru the outlet. I do not have any manuals for the microwave,...

with any luck you have just poped the inline fuse,
if you remove the control board you should be able to see the tube fuse up by the fan motor
if not the whole thing will have to come down to reach it

Oct 14, 2009 | Whirlpool MH3185XP Microwave Oven

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