Question about Panasonic NN-T990SA Microwave Oven

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Turns off after 3 sec

After 3 sec, the microwave shuts off, when in high power. When in a lower power level, it will stay on a little longer..5-6 sec

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Usually this indicates failure of the magnetron and/or the inverter. Neither is easy to test without specialised HV equipment. Often the cause is operating the oven without anything in it. If this has happened, it will generally be failure of the magnetron.

Replacement of the magnetron is relatively easy (about 15 minutes) and the inverter a little longer but if you do not have the knowledge/skills please do not do it - there are very dangerous (deadly) voltages associated with magnetrons even after they have been switched off.

Cost of magnetrons ranges upwards from USD25 to USD100 (from Panasonic spare parts) and inverters range upwards from USD125. The cost of parts is often the reason microwave ovens are not repaired.

Doug

Posted on Nov 08, 2008

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You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

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