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I have a Home Bakery Unit (Model No. HB-D102) that has stopped heating. I have checked the heating element with a continuity tester and it ha checked out as NOT being burned out. What might be the problem? Is there a fuse in the system that might have blown>

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Hello,

Some models may have a separate high voltage fuse. If this is blown, there will be no heating but no other symptoms. However, high voltage fuses are somewhat rare on domestic ovens.
A number of failures can result in the fuse NOT blowing but still no heat:

  • Bad connections - these may be almost anywhere in the microwave generator or the primary circuit of the HV transformer. A common location is at the crimp connections to the magnetron filament as they are high current and can overheat and result in no or intermittent contac.
  • Open thermal protector - usually located on magnetron case. Test for continuity. It should read as a dead short - near zero ohms.


  • Open thermal fuse - some ovens have one of these in the primary circuit. It may be in either connection to the HV transformer or elsewhere. Test for continuity. It should read as a dead short - near zero ohms. A shorted HV capacitor would likely immediately blow the fuse.
  • Open magnetron filament - This failure may also be due to loose, burnt, or deteriorated press (Fast-on) lugs for the filament connections and not an actual magnetron problem.
  • Defective HV relay. A few models use a relay in the actual high voltage circuitry (rather than the primary) to regulate cooking power. This may have dirty or burnt contacts, a defective coil, or bad connection.

Posted on Sep 10, 2010

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