F 3 means blown fuse , which is located on the right side of the unit at the bottom , third one accross, once you have tested the fuse and found it to be faulty, before replacing it , you have to find out why it has failed, there are several reasons why this has happen , 1/ if primary and secondary interlocking door microswitches on left side panel open before monitor door switch on the other side ,it will put a short accross L1 AND L2 blowing F3 fuse , 2/ CHECK high voltage transformers to see if there are signs of burning on either primary or secondary windings, if you are not a tech or a electrician it is very hard to explain how to test to the other componets, capacitor doide or magnetron visual inspections is all you can do
The I/O board is sensing less than 6amps the HV transformer should draw approximately 9amps if the board senses less than 6amps the magnetron circuit will be shut down,
A faulty diode will give less than 3amps, however could be the HV transformer windings if they are ok and the filament transformer windings are ok then you have a faulty magnetron, in some cases the current monitoring transformer on the I/O board can be faulty but this is not common
SOURCE: i have a f3 mag current error is coming.... and it
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
SOURCE: F3 mag current
well...seems that you have an early warning of a possible failure of a major component. Is this unit still under warranty, by chance?
SOURCE: TURBOCHEF TORNADO OVEN...Errors F3 Mag Current and
the mag's only activate while in cook cycle, it will be hot as normal with toasted subs that are cold in the center.
AMP draw the Mag's and ohm the Mag thermal couples
SOURCE: F3 code I have replaced 2 high voltage
holy **** that was a very expencive fix huh. I hope you spent the 50 bucks and have a service manual. What about the diodes, have you tested or changed those. That looks like the last thing i would change and there only a few bucks so i would change them at this point anyway. Are you blowing a fuse at all.
You need to narrow the problem down, not just toss money into the toilet replacing good parts. If your reading 15.1 amps then you have no problem in the high voltage system. Unless the amps are ramping or erratic. Your I/O board is bad if its reading 15.1 and triggering an f-3 fault. You said you replaced it though. Contact who you purchased it from and see if they will help. Its a $420 board and $160 for each HV Transformer they should help. I would guess that your I/O board it bad. You also said you changed relays. Did you change the K2 relay.
Hope you can solve the problem quick. Hopefully this helps
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
Good Luck If you have anymore questions just ask.
F3: Magnetron Current Low
Fault is displayed when the current transformer
(CT) on the I/O control board does not detect
enough current. The fault is monitored when the
microwave is on during a cook cycle or self-test.
The fault is cleared from the display at the onset of
a cook cycle if the CT detects current or when the
magnetron is successfully energized in Test Mode
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