Hello, I have a code F3 wich means that there's a low currant on the magnetron do I have to replace both Mag. ?
No you don't, but depending on the model, I might recommend it.
The magnetrons themselves aren't that expensive, nor that difficult to remove. However, the root cause of their failure is generally associated with a waveguide getting contaminated by grease. Any arcing in there which took out a magnetron also would have damaged a waveguide. The waveguides will need to be removed for inspected and likely need replacing along with new seals. Getting the waveguides out takes a considerable amount of disassembly. Even once removed, poor visual access to the inside of a waveguide really doesn't permit a conclusive inspection.
The other working magnetron may not be as well off as you hope until it's removed and everything inspected. If one got damaged due to arcing and carbon tracking caused by grease, the other magnetron and its waveguide may be getting into the same condition.
There's considerable amount of disassembly to address the failings of magnetrons in TurboChef ovens, so a large chunk of your costs will be in labor. Since it's gotta come apart anyway, I tend to recommend going with new, clean parts during all that - to give the oven a fresh new start.
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