I have a Sharp Carousel Convection Microwave R-9H56. The microwave works fine. The problem is the convection. You set it to pre-heat and it goes through the motions like it is preheating ie. carousel rotating, light on, making noise like it is working, but it takes forever. Eventually it suddenly stops (makes no sound like it has turned itself off). The display is static, displaying the temperature I was trying to heat it to and if you feel inside the oven it is stone cold (hasn't heated at all although it says it is preheating for so long). Another problem is it doesn't do it all the time. 50% of the time it works fine then next thing it won't. Taken it to be repaired twice. Had the thermostat replaced but still doing the same thing. Repairers cannot find problem. Help please. I really don't want to replace it as I love this oven.
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This happens because of a bad door switch . The plastic mounts inside
the microwave which hold the door switches and onto which the door
latches lock when you close the door .
Check also the turntable .
It could be out of it's right place .
slam your microwave door because this may cause the fuse to blow and
this is the reason of bad door switch problem . 2: A microwave is
capable of giving you a serious electrical shock even when it's
unplugged , so I recommend you to call a repair technician for help .
There are a couple of safety thermostats in the oven to shut down power if something overheats. One is on the magnetron tube (the microwave source), the other is on the cooking cavity. These sometimes go bad. There's also a power line fuse that may have failed, or become loose in its mounting clips. These can be tested with an ohmmeter; they should all measure very close to zero ohms if they're good.
Another possibility is that the control circuit board in the oven may have failed. I have worked on several Sharp ovens where the power transformer for the board has gone bad for no good reason. If the board goes bad the oven may appear to be dead as well.
Microwave servicing is best left to professionals. If you're thinking of keeping this one, take it to a service shop (or call for home service) and get an estimate. Then decide whether to repair or replace.
Hope this has helped a little. Thanks for using Fixya!
Is it totally dead? No display? Or just does not cook? If it made an unusual noise before it 'died' something probably shorted out.... You need an ohm meter to troubleshoot. If the fuse is open, switches and HV circuit need to be checked before replacing fuse. Sometimes on the convection Microwaves (not just Sharp) the fuse will 'rust' and open rather than blow. Or the fuse holder can over heat and fail.
Check that the plastic connector from your motor to the turn table is not broken , mine broke and it took weeks to solve the problem. Try rotating the part that protrude into the oven. If you can turn it by hand it is broken, lucky cheap to replace