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Sharp R-930 convection/microwave works fine in all microwave modes but convection heating shuts down during warming up process (whether preheat, hi or lo mix, or normal convection). It will immediately restart when start button hit again but then continues heating up to very hot, apparently independent of temperature setting.
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Possibly a bad oven temp sensor. If the uinit doesnt read a temperature it will shut down to prevent a fire or over heating. The temp sensor is a thermister A temperature variable resistor that changes value as the temp changes. so If the main board doesnt get a response within a vertain resistance range it shuts things down. Sometimes since those parts are in the actual cooking area and subject to the heat and steam from cooking they can rust and break, or just get old and break. Or slam the door and break, you get the idea!!
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This
is a problem in one of the damper-related components, either the switch or motor or the damper door may be binding.
The
damper is a door inside that opens or closes depending on cooking mode.
If the controller senses that the door is not in the right position, it
will shut down the cook cycle.
Sharp models stop after
59 seconds.
See the attached sample
photo for a typical damper assembly.
This UK model is probably similar to the US model R-930 or R-820.
We have both service manuals at our site and while the part numbers will not necessarily be the same, they will be handy for safety, disassembly and troubleshooting. They are here and here.
When you're ready to order parts, visit Sharp UK for spares dealers and servicers.
We're happy to help and we appreciate your thoughtful rating of our answer.
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