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How do I find the fault?

I have a Panasonic Combi Iverter Microwave Model number NN-A574SBBTQ which upon switching on to use in any mode switches off after 5 seconds and the fan continues to operate for a further 38 seconds. What is the fault and how do I fix this?
KC VORA, April 2010
link Click here to see other fixes for Panasonic.