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Panasonic Microwave Combi Oven - convection heating not working on timer

Panasonic NN750WB.
Fairly subtle problem - the convection function (on its own, in combination with micorwave or on 'turbo bake' setting) doesn't activate with the program timer. Convection works on pre-heat i.e. the elements come on and bring the oven up to temperature but when a time is programmed in they stop activating. The grill function works on the timer and uses the same elements. Have taken the outer case off and can't see any obvious dodgy connections.

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Posted on May 27, 2008

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Judging from the model and without looking it up I expect that unit has an inverter. If it is not the Switches and you have replaced the mag, the inverter is the power supply for the mag to work so either mag not getting power from inverter or inverter not getting signals from main PCB Timer board.

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The cost of the magnetron is about 95% of the cost of a microwave oven. Most people don't, for this reason, replace the magnetron, they replace the whole oven which is probably what you will end up doing.

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The first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

Let us know if the hard reset does not fix it.

If it stops at 16 seconds and is a sensor model, it probably has a defective humidity sensor.

If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter or a bad magnetron.

If you do indeed have a problem, Since it's less than one year old, it should be fully covered under warranty. I'd suggest contacting the manufacturer to get it fixed free.

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We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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