Question about Siemens HF87950GB Convection Microwave Oven

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Siemens HF87950GB /03

I was trying to use the grill when the electricity tripped out. The power supply was restored and the display lit up then shortley after faded out. You are just able to see the shadow of the digits on the display which shows up error 4. Error 4 is supposed to be a faulty temperature sensor which i have purchased and replaced. I switched the oven back on and am still left with the same problem. can you help

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Re: Siemens HF87950GB /03

If the display is dim and another problem is denoted on the dim display, the problem may be the power supply which may be in common with both items. The power may have surged to a high level before going out which could have damaged the power supply. The only way to know is to probe the power supply with a voltmeter. If the board doesn't show the power levels, usually +5V or +/- 12 V DC, read the values on the electrolytic capacitors on the board. Usually 16 V caps are used on 12 or 5 volt supplies, 32 V caps on 24 V supplies, etc. Be very careful or leave this to a profesional

Posted on Nov 30, 2007

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