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We are getting these maintenance mode codes which indicate operation time of the magnetrons have exceeded 1250 hrs and the exhaust motor is over 3000 hrs. Assuming I replace the items, how do you reset the hour count? Since the unit still produces full heat (just shuts down before finish time) can I just reset/override the hour count?
Take it in for professional repair. They are too dangerous to work on. There is 125,000 volts in the capacitor just waiting for you to get near it. The magnetron will make you blind in about 15 seconds and the core is a poisonous heavy metal. It is a $2,190.00 commercial microwave so worth getting repaired professionally. It must have earned its money.
Service Manual, and note:
WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock. (High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..)
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The magnetron carries the part number for itself. You can sight it by removing the cover. Parts are available from the maker or repairs agents. However, the cost of a new magnetron may exceed the cost to replace the Microwave Oven.
Before removing the cover of the oven in attempt to carry out any maintenance such as replacing the Oven cavity lamp, make sure the oven is disconnected from the power point ! The voltages in a microwave oven ARE LETHAL !
If everything works, but the microwave oven does not heat, this is commonly caused by a failed magnetron. The magnetron is essentially, the heart of the oven that produces the RF energy that is used to heat your food. In order to replace a defective magnetron, you will need to consider the following: 1. You will need to uninstall the oven from over the range in order to replace the part (you will need to do this anyway, if you decide to buy a replacement oven). 2. Ensure the oven is UNPLUGGED before servicing anything inside the cabinet and remove the exterior case in order to access the magnetron. There are several websites that you can use that illustrate how the oven is assembled: searspartsdirect.compcappliancerepair.comappliancepartspros.com NOTE: If you've never repaired an appliance on your own before, a microwave oven is usually not a recommended appliance to start with. Some models can be rather involved in taking apart. 3. The magnetron replacement part number for the model you have listed is 505137 and is listed as item 1-12 in the parts index. It costs about $100. 4. This model also has a thermperature fuse, listed as item 1-10 that can also cause the same symptoms if blown. The fuse is essentially a thermostat acts as a fuse if the oven cavity overheats. The part number is 46-1518457-3. You will need to remove the thermostat from the oven and take a resistance check across the component terminals to determine if it is good or not. A low resistance reading indicates a good thermostat. An infinite reading, indicates a blown thermostat and needs to be replaced. The average replacement cost is about $10. I would recommend you check all fuse associated with the oven before assuming the magnetron has failed. Review the parts illustrations at the recommended websites to see if this is something that you may be able easily take apart and reassemble. If you have any questions, please post back and let me know. I hope you find this information helpful.
CAUTION: DO NOT operate a microwave oven with the exterior cover off. The voltage inside the High Voltage network where the magnetron is installed can exceed 3,000 volts!
The fact that the microwave and convection both do not heat indicated that the oven is in demo mode, check the user manual, otherwise it will possibly be a relay not triggering, may need a pcb replacement, check Demo mode 1st....Phil
This is usually an indication that the magnetron has gone bad, or something in the high voltage network controls the magnetron. Any one of the following components could be at fault:
1. Magnetron
2. High Voltage Transformer
3. High Voltage Diode
4. Magnetron Thermal Cut-out
5. High Voltage Capacitor
6. Interconnecting wiring
I do not advocate taking any voltage measurements inside the High Voltage section of a microwave since the voltages can be as much as 14,000 volts or higher. If you are savvy enough to attempt yourself, WITH THE MICROWAVE UNPLUGGED, you will need to disassemble the unit to get to the high voltage section and take resistance readings. The magnetron or diode are likely suspects. If the magnetron or the transformer are bad, the repair costs can meet or exceed the price of the oven. Let me know if you need further assistance.
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