F3 MAG CURR means you have a problem with the high voltage system in your oven, the microwave circuit.
The next part is extremelydangerous, if you have no background in electric STAY OUT. CALL A PRO you will be working with 5000 volts.
With that said you will need a clamp on ampmeter to measure the current to narrow down the problem.
Discharging can be done by unplugging the oven and then short across the red wire on each capacitor to the chassis with an insulated screwdriver. 1. Remove the top and right side covers. 2. Enter the test mode. (From the OVEN OFF mode, simultaneously press BACK and ENTER keys, enter the code 9-4-2-8 and press ENTER). 3. Place amp meter on the brown "ct" wire for amp reading. Wire is coming from the primary side of the HV transformers and looping through the black plastic current transformer on the main control board and back to the HV transformers. 4. Press and hold the MGTRON soft key on the keypad to energize the magnetrons. 5. Observe the amperage on the meter. Typical readings are: NORTH AMERICA: 12-14 amps at 240VAC/13-16 amps at 208VAC. If you are getting 12-16 amps then change the I/O board.
If you are only getting 7 or 8 amps then only one side of the of the HV system is not working correctly. You will need to figure out which side is bad by un-plugging the power wires going to one of the HV transformers. Then test again and if you get no amps you have found the bad side. Replace the HV transformer, cap and diode.
If you are not getting any amps then check the F3 fuse it will most likely be blown. Replace and start over
Answers & Comments
F3 MAG CURR means you have a problem with the high voltage system in your oven, the microwave circuit.
The next part is extremely dangerous, if you have no background in electric STAY OUT. CALL A PRO you will be working with 5000 volts.
With that said you will need a clamp on ampmeter to measure the current to narrow down the problem.
Discharging can be done by unplugging the oven and then short across the red wire on each capacitor to the chassis with an insulated screwdriver.
1. Remove the top and right side covers.
2. Enter the test mode. (From the OVEN OFF mode, simultaneously press
BACK and ENTER keys, enter the code 9-4-2-8 and press ENTER).
3. Place amp meter on the brown "ct" wire for amp reading. Wire is coming from the primary side of the
HV transformers and looping through the black plastic current transformer on the main control board and back to the HV transformers.
4. Press and hold the MGTRON soft key on the keypad to energize the magnetrons.
5. Observe the amperage on the meter. Typical readings are:
NORTH AMERICA: 12-14 amps at 240VAC/13-16 amps at 208VAC.
If you are getting 12-16 amps then change the I/O board.
If you are only getting 7 or 8 amps then only one side of the of the HV system is not working correctly. You will need to figure out which side is bad by un-plugging the power wires going to one of the HV transformers. Then test again and if you get no amps you have found the bad side. Replace the HV transformer, cap and diode.
If you are not getting any amps then check the F3 fuse it will most likely be blown. Replace and start over