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HomeRepair HelpDacor Microwave RepairDacor Microwave not heating Repair
Dacor Microwave not heating
When your Dacor microwave is not heating, the high-voltage diode is the most likely cause. A failed diode may look burned and prevents the magnetron from receiving the voltage needed to heat food, so the microwave may run but not heat. Next, check the door switch, since a faulty primary, secondary, or monitor switch can prevent the oven from starting the heating cycle even when the controls work. A burned-out magnetron can also cause a microwave not heating food, while an open thermostat may stop voltage from reaching the high-voltage components after overheating. Less common causes include a failed high-voltage capacitor or high-voltage transformer. The capacitor and transformer power the magnetron, and a transformer failure may produce arcing or a burning smell. Any repair that requires removing the outer cabinet or testing the magnetron, high-voltage diode, high-voltage capacitor, or high-voltage transformer requires proper capacitor discharge. The capacitor can store a lethal charge even after the microwave is unplugged, so use a qualified technician if you are not familiar with safe discharge procedures. Enter your model number to find the exact replacement part for your Dacor microwave.
01 - Dacor Microwave Diode
The diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron to heat the food. If the diode burns out, the magnetron won’t receive enough voltage to operate, preventing the microwave from heating. When the diode fails, it is often visibly burned out. Inspect the diode and if the diode is burned out, replace it. If inspecting the diode proves inconclusive, test it with a multimeter that uses a 9-volt battery or put a 9-volt battery in series with the diode. When the leads are reversed, the diode should only have continuity in one direct...
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02 - Dacor Microwave Door Switch
Most microwaves have three or four door switches. When the microwave door closes, the door switches actuate in sequence to ensure that the door is closed properly. If any of the door switches fails, the microwave will not start or heat. To determine if any of the door switches are defective, use a multimeter to test each of the switches for continuity. If any of the door switches does not have continuity, replace it. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremel...
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03 - Dacor Microwave Magnetron
The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the magnetron burns out, the microwave won’t heat. The magnetron is not repairable—if the magnetron is burned out, you must replace it. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the high running voltage and the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the magnetron.)
Highly Likely
04 - Dacor Microwave Thermostat
If the microwave overheats, the thermostat trips to cut off voltage to the microwave. If the thermostat is shorted open, it may not allow voltage to reach the high voltage components. To determine if the thermostat is at fault, use a multimeter to test it for electrical continuity. If the thermostat does not have continuity, and it cannot be reset, replace it.
Highly Likely
05 - Dacor Microwave High Voltage Capacitor
The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out, the entire high voltage circuit will stop working properly, and the microwave won’t heat. To determine if the high voltage capacitor is defective, use a VOM meter with a capacitance testing capability. (“Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the high running voltage and the potential for electric shock, it is extremely dangerou...
Common
06 - Dacor Microwave High Voltage Transformer
Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food. When a high voltage transformer fails, it will usually arc and have a burning smell. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the high running voltage and the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the high voltage transformer.)
Common
Frequently Asked Questions
Why is my Dacor microwave running but not heating food?
How do I test a Dacor microwave door switch when the microwave turns on but doesn't heat?
Can a Dacor microwave diode or magnetron cause it to stop heating?
What should I check if my Dacor microwave is not working or has no power?
How do I find the correct Dacor microwave replacement part?
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