Question about GE Spacemaker JVM1640SJ Microwave Oven

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EM925AJW-P2 not heating

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Several possible causes - failure of the magnetron or high voltage rectifier or a shorted high voltage capacitor. Also, the transformer may not be receiving 120 v (on U. S. units) from whatever controls it. Checking to see if 120 v is present would be the first step. If it's there, the high voltage diode should be checked for continuity to make sure it conducts in only one direction. Then, the high voltage capacitor should be checked to make sure it is not shorted. If everything's o.k., the magnetron filament should be checked for continuity. Also, check for a short between the cathode and the case. There's also the possibility that one of the door switches has failed, or is not being activated. Keep in mind that these ovens run on 4000 volts, or more, and you can easily be electrocuted if you don't understand what you're doing. Some can maintain the 4000 volt charge on the high voltage capacitor indefinitely.

Posted on Apr 16, 2014

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Posted on Jan 02, 2017

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I have a Timesaver 1000w Samsung microwave. Just started to get error messages of p2 and p1 as I have lost the manual a long time ago could you explain what these codes mean.


There are no user serviceable part on a microwave and the screws holding the case are security screws. You are better off taking it for service.

There are fault codes here, but no P codes.

Microwave Fault Codes

Jan 20, 2016 | Samsung Microwave Ovens

1 Answer

Microwave error message F7


This is for whirlpool models.Try this procedure and see if it helps.what is your model?
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 magnatron.
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.

Feb 11, 2013 | Microwave Ovens

1 Answer

MY microwave is giving me an error code F7 - call for service


This is all i could find on this error, Its alot to check. 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 magnatron.
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

Jun 23, 2011 | Whirlpool GMH5205XVS Microwave Oven

1 Answer

Code f7 comes up on the timer won't run more than 30 sec


The following is pulled directly from this forum, where someone ran into a similar problem. I hope this is helpful:
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 magnatron.
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.

Jun 17, 2011 | Whirlpool GMH5205XVB Microwave Oven

1 Answer

I HAVE LOST MY POLDER THM-360 MANUAL. I CAN'T SEEM TO CHANGE THE TEMPERATURE. I PUSH THE +/- AND IT DOES NOT CHANGE. WHAT AM I DOING WRONG?


here's link to POLDER THM-360 MANUAL online.

http://polder.com.p2.hostingprod.com/images/instructions/THM-360_instructions.pdf

Nov 23, 2010 | Microwave Ovens

1 Answer

Error F7


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 magnatron.
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.

Nov 18, 2009 | Whirlpool GH9176XMS 1100 Watts Microwave...

1 Answer

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: http://tinyurl.com/yzjozk

 

F7 BULLETIN

 

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.

NOTES ON INVERTERS

 

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.

Oct 10, 2007 | Whirlpool GH6178XPS Microwave Oven

2 Answers

NATIONAL NNN -C 2000P LOW VOLTAGE PRIMARY GETS FREQUENTLY OPENED


There is something on the secondary side which is drawing too much current. I would check all electrolytic capacitors, zener diodes, transistors, and voltage regulators.

Mar 27, 2007 | Panasonic NN-C994S Convection/Microwave...

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