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I have a Whirlpool AVM955 built in microwave and cooker hood combined. Installed it 20 years ago. Recently it started being very loud with its buzzing and not heating up anything. Quick google check, probably mag/diode/capacitor issue.
No problem, I happened to have a complete spare unit (I somehow ended up with 2 20 years ago by mistake and ended up keeping the second). So, I swapped the whole unit out for the brand new one. Works fine for 4 days.
Then, today, exact same fault with the new unit. Very loud buzzing, not heating anything up. Now unless Whirlpool have built something in that fails 20 years later its very strange how a brand new unit (although still 20 years old) would fail with the same fault?
I did test the diode of the first one (using a 9v batter y and meter as per online advice as a meter diode test doesnt work so well on an NV diode) and it appeared to show the diode still working correctly.
this sounds like bad luck but i have to make sure you realise the dangers. There are lethal voltages involved here that under fault conditions can give you a lethal shock even if the unit is unplugged unless you follow the correct procedures
it now depends on what has failed as it may not be the same component on both units
it could be
transformer
diode
short circuit protector (if fitted)
capacitor
magnetronall these components work at 5000v dc
if its a diode or the cap it wont cost too much
if its the transformer then its scrap
the mag is more expensive but should not be difficult to obtainbut it really is a job for a professional
Dave
It depends on how much money you are prepared to throw at it as the appliance cannot be replaced.
Don
Thanks for the replies. I’m not a domestic engineer but am an electrical one with 31 years experience of working with 3 phase 5kV machines. I will be ensuring the capacitor is properly discharged. I’ve received a replacement diode so Ill replace that one in the newer of the two machines mainly because the original is quite greasy and dirty all over. Transformer pri and sec windings read ok, as does the insulation as far as I can tell. Ill get a replacement capacitor too, its not that much
I’m surprised that combined microwave/cooker hoods are few and far between nowadays.
no call for it is the simple answer
diode and cap double voltage and convert to DC
if you get stuck let me know but dont want to have discussion on public forum as i dont want to encourage people who have no satety knowlege with HV trying silly thingsDave
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