Question about Sharp R-5H08 Microwave Oven

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I broke the START button and in order to heat I use the sensor button. Can this be fixed on the microwave? or do I have to replace? Any help would be appreciated. Thanks, Elaine

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The part number for the Start button on this microwave was JBTN-B048MRF0, but it shows as being unavailable.

We may be able to repair it for you, though. Details here.

Posted on Jan 02, 2011


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Posted on Jan 02, 2017

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You probably just have a bad humidity sensor (aka gas sensor).Also be sure the internal cooling fan is running. That's critical.
We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are working.
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If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.
You can find handy exploded views and order parts by model number here.
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You probably broke the door sensor switch.

The part must be tested before replacement.

Parts can be purchased from Partselect, Appliancespartspro, or Repairclinic. Have a look on google.

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You need to replace the whole door latch with an original part.

If it is working but not heating, then test the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.If turntable is not running check also the door switch.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

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I have a Sharp Micro Wave Model R 1512 F that the start minute plus key is broke. This is the third time and I would like to fix it myself. I can not afford another service call on this one, How do I fix...

You can order a new and improved select button assembly here.

We have the service manual for this model and have uploaded it to our site here to help you.

That, plus the R-1500-series service manual here will help you safely disassemble it so you can replace the select button assembly.

Also at our site, we have a video available how to remove a typical over the range control panel assembly in under 5 minutes.

You will need the free Acrobat Reader to view or print it in case you don't have it already.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

Here is a helpful link you or someone you know can use for test help, but read their safety warnings first:

Info on ordering Sharp UK parts / spares is here.

The best place to order Sharp parts in the US is Tritronics.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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Generally, the most common causes of a failure to heat are:

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If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa:

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

Please write back with your brand and model number if you need further help.

We're happy to help and we appreciate your thoughtful rating of our answer.

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