Power Supply I checked the ceramic fuse after the switch assembly and that was fine. The I/O switch itself was tested to be ok also. Everything I'm reading points to the power supply? Is this correct and if so, where can I order one for Protron??

Door Switch Start Your Repair Here
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- Takes less than 15 mins
We have 13 installation instructionsThere are many reasons your microwave won't turn on, one of which might be a faulty door switch. The door switch, also known as an interlock switch, signals other microwave components to begin powering when the door is closed, and to stop when the door opens. For this reason, everything else may appear in working order but the microwave will not begin heating. To access the door switch or interlock switch, unplug the microwave and dismantle the cabinet. The switches have terminals which are marked C for common and NO for normally open. Check each terminal with a multi-meter for continuity. If there is continuity while the actuator button is engaged, that means the switch is working. If there is no continuity, replace the switch. You can also take this opportunity to make sure the door hooks are working properly.
Ceramic Fuse Start Your Repair Here
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- Takes less than 15 mins
We have 1 installation instructionIf your microwave won't start and the display is blank and unresponsive, the issue may be with the ceramic fuse. This part protects other microwave components from power fluctuations, and causes a complete loss of power when it fails, meaning your microwave won't work. To access the ceramic fuse, located inside the cabinet near the power cord, first unplug your microwave. Use a multi-meter to test the continuity of the fuse. If you are aware of the cause of the fuse failure, such as opening or closing the microwave door, you can also test the door switch to see if that is working. If you are unaware of the reason for the fuse failure, you may want to test other microwave parts such as the magnetron, high voltage diode, capacitor, and transformer.
Thermal Fuse or Cut Out Start Your Repair Here
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- Takes less than 15 minsA problem with the thermal fuse or cut out could be the reason your microwave won't turn on. The thermal cut-outs, also known as thermal fuses, help keep the oven from overheating. When the thermal cut-outs fail, your microwave won't turn on as a safety precaution to keep it from getting too hot. To access the thermal cut-outs, first unplug your microwave and then remove the cabinet. Once you locate the thermal fuse, disconnect its wires from the terminals. Use a multi-meter to test for continuity, and replace the thermal cut-outs if there is no continuity. Take this opportunity to also check that the cooling fan is working and not causing the microwave to overheat by cutting off airflow.
Door Latch Assembly Start Your Repair Here
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- Takes less than 15 mins
We have 4 installation instructionsYour microwave may not start because of an issue with the door latch assembly. Most door latch assemblies are made of plastic hooks that stick out of the door and engage the door switch when the door is closed, signalling the rest of the controls to power the microwave. If the hooks are damaged or lacking tension due to worn-out springs, the switch will not latch properly meaning the microwave won't turn on. To access the door latch, first disconnect the microwave from its power source, and remove the inside door panel, which is held in place with plastic tangs. Inspect the door latch and replace it if it appears to be damaged.

please follow the steps and fix it. God bless you
her won't start, the user control and display board may be defective. Check for power to the washer first.

Timer

If the washer won't start the timer might be defective. This part is often misdiagnosed, check other components before replacing this timer.

Line Fuse

If the washer won't start the line fuse might have blown.

Thermal Fuse

If the washer won't start the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

Line Fuse and Holder

If the washer won't start the line fuse might have blown, or the line fuse holder might be damaged and need to be replaced.

Main Control Board

If the washer won't start the main control board might be defective. This is not common. Check other parts and causes first.

Door or Lid Latch Assembly

If the washer won't start the lid switch assembly might be defective. This is a very common problem. The lid switch assembly can fail either mechanically or electrically. Test any electrical switches with an Ohm meter for continuity. The switches should have continuity according to their design.

Door Lock Motor and Switch Assembly

If the washer won't start the door lock assembly should be checked. The door lock can fail either mechanically or electrically. Test any switches on the door lock with an Ohm meter. The switches should have continuity according to their design.

Incoming Power Problem

If the washer won't start check to see if there is power at the electrical outlet which the washer is plugged into. Plug a lamp or radio into the outlet to check it. If the outlet is dead, check the circuit breakers or fuses for the home.

Power Cord

If the washer won't start, check to be sure there is power to the electrical outlet for the home. If that is OK, the power cord itself might be defective. This is rare. You can check the power cord with an Ohm meter for continuity.

test the following steps and fix it. God bless you
If the washer won't start, the user control and display board may be defective. Check for power to the washer first.

If the washer won't start the timer might be defective. This part is often misdiagnosed, check other components before replacing this timer.

If the washer won't start the line fuse might have blown.

If the washer won't start the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

If the washer won't start the line fuse might have blown, or the line fuse holder might be damaged and need to be replaced.

If the washer won't start the main control board might be defective. This is not common. Check other parts and causes first.

If the washer won't start the lid switch assembly might be defective. This is a very common problem. The lid switch assembly can fail either mechanically or electrically. Test any electrical switches with an Ohm meter for continuity. The switches should have continuity according to their design

If the washer won't start the door lock assembly should be checked. The door lock can fail either mechanically or electrically. Test any switches on the door lock with an Ohm meter. The switches should have continuity according to their design.

If the washer won't start check to see if there is power at the electrical outlet which the washer is plugged into. Plug a lamp or radio into the outlet to check it. If the outlet is dead, check the circuit breakers or fuses for the home.

If the washer won't start, check to be sure there is power to the electrical outlet for the home. If that is OK, the power cord itself might be defective. This is rare. You can check the power cord with an Ohm meter for continuity.

see this causes and fix it. God bless you
User Control and Display Board If the washer won't start, the user control and display board may be defective. Check for power to the washer first.

Timer If the washer won't start the timer might be defective. This part is often misdiagnosed, check other components before replacing this timer.

Line Fuse If the washer won't start the line fuse might have blown.

Thermal Fuse If the washer won't start the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

Line Fuse and Holder If the washer won't start the line fuse might have blown, or the line fuse holder might be damaged and need to be replaced.

Main Control Board If the washer won't start the main control board might be defective. This is not common. Check other parts and causes first.

Door or Lid Latch Assembly If the washer won't start the lid switch assembly might be defective. This is a very common problem. The lid switch assembly can fail either mechanically or electrically. Test any electrical switches with an Ohm meter for continuity. The switches should have continuity according to their design.

Door Lock Motor and Switch Assembly If the washer won't start the door lock assembly should be checked. The door lock can fail either mechanically or electrically. Test any switches on the door lock with an Ohm meter. The switches should have continuity according to their design.

Incoming Power Problem If the washer won't start check to see if there is power at the electrical outlet which the washer is plugged into. Plug a lamp or radio into the outlet to check it. If the outlet is dead, check the circuit breakers or fuses for the home.

Power Cord If the washer won't start, check to be sure there is power to the electrical outlet for the home. If that is OK, the power cord itself might be defective. This is rare. You can check the power cord with an Ohm meter for continuity.

seethis causes and fix it. God bless you
User Control and Display Board If the washer won't start, the user control and display board may be defective. Check for power to the washer first.
Timer If the washer won't start the timer might be defective. This part is often misdiagnosed, check other components before replacing this time
Line Fuse If the washer won't start the line fuse might have blown.
Thermal Fuse If the washer won't start the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.
Line Fuse and Holder If the washer won't start the line fuse might have blown, or the line fuse holder might be damaged and need to be replaced.
Main Control Board If the washer won't start the main control board might be defective. This is not common. Check other parts and causes first.

Door or Lid Latch Assembly If the washer won't start the lid switch assembly might be defective. This is a very common problem. The lid switch assembly can fail either mechanically or electrically. Test any electrical switches with an Ohm meter for continuity. The switches should have continuity according to their design.

Door Lock Motor and Switch Assembly If the washer won't start the door lock assembly should be checked. The door lock can fail either mechanically or electrically. Test any switches on the door lock with an Ohm meter. The switches should have continuity according to their design.

Incoming Power Problem If the washer won't start check to see if there is power at the electrical outlet which the washer is plugged into. Plug a lamp or radio into the outlet to check it. If the outlet is dead, check the circuit breakers or fuses for the hom
Power Cord If the washer won't start, check to be sure there is power to the electrical outlet for the home. If that is OK, the power cord itself might be defective. This is rare. You can check the power cord with an Ohm meter for continuity.

see this causes and fix it. God bless you
User Control and Display Board If the washer won't start, the user control and display board may be defective. Check for power to the washer first.

Timer If the washer won't start the timer might be defective. This part is often misdiagnosed, check other components before replacing this timer.

Line Fuse If the washer won't start the line fuse might have blown.
Thermal Fuse If the washer won't start the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

Line Fuse and Holder If the washer won't start the line fuse might have blown, or the line fuse holder might be damaged and need to be replaced.

Main Control Board If the washer won't start the main control board might be defective. This is not common. Check other parts and causes first.

Door or Lid Latch Assembly If the washer won't start the lid switch assembly might be defective. This is a very common problem. The lid switch assembly can fail either mechanically or electrically. Test any electrical switches with an Ohm meter for continuity. The switches should have continuity according to their design.
Door Lock Motor and Switch Assembly If the washer won't start the door lock assembly should be checked. The door lock can fail either mechanically or electrically. Test any switches on the door lock with an Ohm meter. The switches should have continuity according to their design.

Incoming Power Problem If the washer won't start check to see if there is power at the electrical outlet which the washer is plugged into. Plug a lamp or radio into the outlet to check it. If the outlet is dead, check the circuit breakers or fuses for the home.

Power Cord If the washer won't start, check to be sure there is power to the electrical outlet for the home. If that is OK, the power cord itself might be defective. This is rare. You can check the power cord with an Ohm meter for continuity.

in most cases the reason for microwaves shutting down without warning is the fuse. in some cases the fuse will fail at its own fault. to test the fault we would do a tollerence test on the unit. but the best way for you to test it is to replace the ceramic fuse with another of the same value. if the unit works then its a faulty fuse. if the unit blows the fuse then the unit has a fault in the power supply that needs to be repaired by a service tech.

Fuse is probably blown

can't give you much guidence - will be either regulator or the plate itself. no easy way to find out. you will have to remove the hob top and check for continuity thro the plate. ifplate is ok, then power up and check for supply to the plate. if no supply, then the regulator will be at fault