Microwave Repairs

We repair all commercial microwave ovens and we carry parts in van stock for many manufactures including:

Samsung
Panasonic
Merrychef
Buffalo
Sharp
Hobart
Menumaster
Meastrowave

REDUCE REPAIR COSTS WITH REGULAR MAINTENANCE

OUR MAINTENANCE SCHEDULE

Microwave Oven
Carry out radiation leakage tests, carry out power test, check condition of roof liner and base plate, remove and check air filter, (clean as necessary). Check operation of control panel switches; carry out earth continuity and insulation resistance tests.

Trouble Shooting

The simplest problems
Faulty interlocks switches or door misalignment can cause fuses to blow or not operation when the start button is pressed. Replace any defective switches and realign the door If your chamber is arching, smooth any rough metal finishes, clean the oven chamber and waveguide thoroughly and replace if necessary any carbonised or damaged waveguide cover.

Problem: Totally dead oven.
Possible causes:
No power to outlet (blown fuse or tripped breaker)
Blown main fuse - likely due to other problems
Open thermal protector or thermal fuse
Defective controller or its power supply
Clock needs to be set before other functions will operate (some models)
Blown fuse due to power surge or old age: Replace fuse. On rare occasions, the main fuse may even be intermittent causing very strange symptoms.

Erratic touchpad operation due to a spill let the touchpad dry out for a week

Problem: No response to any buttons on touchpad.
Possible causes:
Door is not closed (some models)
You waited to long (open and close door to wake it up)
Controller is confused (pull plug for a minute or two to reset)
Defective interlock switches
Faulty controller or its power supply
Touchpad or controller board contaminated by overenthusiastic cleaning
Defective/damaged touchpad

Problem: Oven runs when door is still open.
Possible causes:
Damaged interlock assembly.
Cooling fans (only) running due to bad sensor or still warm

Problem: Oven starts on its own as soon as door is closed
possible causes:
Defective triac or relay
Controller is confused (pull plug for a minute or two to reset)
Defective controller or its power supply
Touchpad or controller board contaminated by overenthusiastic cleaning
Defective/damaged touchpad

Problem: Oven works but display is blank
possible causes:
Defective controller or its power supply
Broken display panel
Oven needs to be reset (pull plug for a minute or two to reset)

Problem: Erratic behaviour
Possible causes:
Previous or multipart cook cycle not complete
Bad connections in controller or microwave generator
Faulty relay - primary (or HV side, much less commonly used)
Defective controller or its power supply
Bad contacts/connections on mechanical timers or intermittent fuse
Power surge at start of cook cycle confusing controller
Microwave (RF) leakage into electronics bay

Problem: Microwave oven does not respond to START button
Possible causes:
Defective START button
Faulty interlock switches
Door is not securely closed
Faulty controller

Problem: No heat but otherwise normal operation.
Possible causes:
Blown fuse in HV transformer primary circuit or HV fuse (if used)
Bad connections (particularly to magnetron filament)
Open thermal protector or thermal fuse
Open HV capacitor, HV diode, HV transformer, or magnetron filament
Shorted HV diode, HV capacitor (will blow a fuse), or magnetron
Damaged protective VDR from filament to chassis (not commonly used)
Defective HV relay (not commonly used)