Question about Whirlpool GH6178XPS Microwave Oven

1 Answer

F-7 My microwave stopped heating. It turns on for a while and then stops with an error message F-7: Call for service.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Whirlpool Master
  • 8,795 Answers
Re: F-7

There is a mini-manual inside the oven which can aid in troubleshooting.


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:




Whirlpool Models GH9177XL GH5176XP GH5184XP GH6178XP GH6177XP KHHS178L KHHS179L


Microwave will not operate (cook). F7 error code appears on the display.


Electrical circuit interruption between L1 and Neutral in the microwave inverter circuit.


Possible reasons:


1. Check door, hinge and cavity front alignment and adjust as needed.


2. Check the operation of all interlock switches.


3. Check over temperature protector for the magnetron.


4. Check all Cavity Thermostats for closed circuit.


5. Unplug the oven for at least 40 seconds. If this solves the problem


A. Check the Cooling Fan for proper operation or blockage


B. Check the resistance of the magnetron thermostat. It should be 0 Ohms, replace if necessary.


6. Check that the control cable to the 1100 watt inverter is properly connected to plug P2 on the display PCB
& Adjust or Reconnect


7. If interlock switches operate correctly, replace 1100W inverter.


8. If problem persists, replace control assembly.



This model uses an inverter to produce high voltage instead of a convential transformer system.


While an inverter (switched-mode power supply) is more efficient from a power consumption standpoint, it is more complex, thus more statistically prone to fail. These should only be examined and worked on by someone who has the necessary technical qualifications. Seriously.


Often the machine-soldered connections in a microwave inverter are too weak, so they eventually fail, especially if heat is high in the area. They sometimes fail catastrophically. When not catastrophically damaged, you may hear clicking or squealing and may smell an electrical odor, which is sometimes obscured by the cooling fan.


Some manufacturers do not encourage or assist technicians to repair microwave inverters. Most offer the inverter as a whole assembly. But sometimes that is actually cheaper than the time and labor required to fix the old one.


If a technician is willing and able to troubleshoot and repair the inverter to component level, it will may be expensive, but may be worth it, especially if he or she will resolder and reinforce connections as needed as part of a thorough repair. That could easily make your inverter beter than a new one!


You might be able to get some verbal estimates if you call Panasonic-authorized repair shops and ask then specifically about inverter repair and inverter replacement costs for your model number.

Posted on Oct 12, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Microwave stop working

my microwave oven just stopped heating giving me a f9 error .lights are on clock is working and the panel is ok.

Jun 15, 2010 | GE Profile Spacemaker Over-the-Range...

1 Answer

My JVM1653 stopped cooking, The turntable turns

your magnetron might be out. its what heats

Feb 13, 2010 | GE JVM1653 Microwave Oven

1 Answer

H98 error message. Micowave not heating, stops after 37 seconds

HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))

Sep 28, 2009 | Panasonic NN-H965 Microwave Oven

1 Answer

Samsung SMH 8165 ST E13 Error message. Oven

I own the same Microwave and it just gave me the same error code E-13. I was heating a large plastic coffee mug of cold water using the "beverage" control. The only thing out of the ordinary was I used very cold water from the Fridge. Maybe this had something to do with the Max time error. Hopefully this was a one off error.

Jun 24, 2009 | Samsung Microwave Ovens

1 Answer

Sharp 930-cs starts fine after 10 or 20 seconds it stops heating, stops spinning & Error message on the display. I replaced the turntable motor but problem continues.

When the Absolute Humidity (AH) sensor is defective (open or short), ERROR will appear in the display after 16 seconds.

If ERROR appears check sensor wire connections and/or AH sensor.

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

It will give you safety info, step by step help in disassembly, troubleshooting tips, and the Sharp part numbers, most of which interchange except cosmetic parts.

Most computers will open this document automatically, but you may need the free Adobe Reader

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

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

Jun 04, 2009 | Jenn-Air JMC7000 Microwave Oven

1 Answer

Microwave stopped heating

More than likely the magnatron has failed,it is the heating source for microwave and usualy has 5 year warranty so it would be worth calling company about this. They will hve service company repair at no cost to you.

Apr 21, 2009 | Microwave Ovens

3 Answers

Microwave, adora, stopped heating

Hi and welcome to FixYa,

Almost always, on most microwave including GE Adora, no heat with all else working indicates a problem with the magnetron. Since the magnetron produces high RF energy and operates on high voltage, it would be to your advantage to seek the services of a qualified professional.

If on the other hand, the fault of no heat is coupled with no display, error messages, door not locking, no light, then it would be possible for a DIY (do-it-yourself) repair. All that is required is a bit of familiarity with electronic components and circuitry, the use of a DVM/VOM of course safe working practices when repairing electrically powered devices.

Pls post back any other symptoms or indicators other than 'no heat'.

Good luck and thank you for using FixYa.

Mar 14, 2009 | GE Adora DVM1850 Microwave Oven

2 Answers


Need to know the entire model # on the microwave.

Oct 05, 2007 | Microwave Ovens

1 Answer

F-9 error on LG microwave

This is a problem with the inverter or magnetron. Due to the lethal voltages involved, I do not recommend that a person without training and experience ever work on these models. You can find support for service or parts at

Sep 15, 2007 | LG LMVM1945 Microwave Oven

Not finding what you are looking for?
Whirlpool GH6178XPS Microwave Oven Logo

481 people viewed this question

Ask a Question

Usually answered in minutes!

Top Whirlpool Microwave Ovens Experts

William Miller
William Miller

Level 3 Expert

8795 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Barrett Palumbo
Barrett Palumbo

Level 2 Expert

1772 Answers

Are you a Whirlpool Microwave Oven Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides