If you had the initiative to use google, you would have found this link previously posted on fixya.
http://www.fixya.com/support/t25247983-p90d23al_manual
google it first, you may find the answer already out 'there'.
SOURCE: Morphy Richards mrm 300 instruction manual
Hey, I have a scanned version (PDF) of the Manual available.
SOURCE: my morphy richards p80d20p-yu microwave runs normal but won't heat food
The problem is caused by a bad magnetron, inverter board, "7 years old or less" and possibily the keypad control board.
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