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NN-A774SBBPQ Invertor & Cat-Clean model.

Quietly popped an internal fuse (10A) during use and went dead. Replaced fuse, display/controls working fine but died when START pressed. Replaced fuse again, removed blown/broken heat element in top (grill?) insulated the wires to that - now not blowing same fuse but still dead. Is there a 3rd fuse position I've missed? HELP!!!

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  • 78 Answers

No 3rd fuse as far as i know just the two on the mains pcb and the plug i would test all three fuses again but if the short has gone back up to the control panel them that might be why its not coming back on if it has blown the control pcb it will show up as ablack mark on the pcb sorry cant be nore help its the sort of thing i would need to see as it could be a door micro switch as well gd luck dont forget to unplug the unit

Posted on Oct 22, 2009

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Posted on Jan 02, 2017

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Check continuity of this 10A fuse to see if it's blown.

What is most likely to have happened, is that an internal short has happened inside the main transformer. These cannot be rectified, and often means scrapping the complete item due to cost of replacement.
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When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

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You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

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