Bosch 00617229 Switch OEM Part

Similar to other stories on here, the microwave was repeatedly tripping the circuit breaker, usually when opening the door. Plugged microwave into a different outlet/circuit, and problem traveled to that breaker, so definitely issue within the appliance. Turned out to be door interlock switch. This model has 3 switches: 2 x AP4512903 (00617228, the Primary and Secondary interlock switches) and 1 x AP4512904 (00617229, the Monitor switch). It was only the Monitor switch that was defective, but I went ahead and replaced all of them, as well as the plastic Door Lock (AP4513044) which was developing some groove wear after 7 years of use (makes the door wobble a bit over time). For good measure I also replaced the plastic Lever (AP5263819, aka 00621573; this snaps inside the door lock and controls the bottom switch’s plunger). So I essentially replaced the entire Door Lock assembly, for about $40. Took about half an hour (I took my time) and a Philips screwdriver. Pro tip: Take close-up photographs so you know where all of the wires from the control panel go. There was a helpful wiring and troubleshooting diagram folded up and tucked inside the control panel from the factory (nice surprise). Testing notes: The top microswitch 00617228 should measure open (no continuity) from terminal to terminal until the plunger is pressed. The middle switch 00617229 should measure CLOSED (with continuity) from terminal to terminal until the plunger is pressed. The bottom switch 00617230 should measure open (no continuity) from terminal to terminal until the plunger is pressed. Two screws hold the Vent Hood piece on; take that off to reveal one screw holding Control Panel in place. Remove that (carefully, don't yank any wires), then two screws hold the entire Door Lock assembly in place. Fairly easy to wiggle out; careful not to disturb the metal microwave shroud behind it. Overall, a fairly easy repair. Very happy with the results; working like a champ again. Super speedy shipping of the parts!

I believe the problem was caused by a power surge when our electricity returned from an outage. FirstI removed the two screws on top and removed the vent. This exposes the one screw that holds the control panel in place. First I checked the fuse to see if blown but it was ok. Two screws hold the plastic. bracket in place that holds the 3 door switches. Uncouple the wires attached to the switches and pull the bracket out. Then carefully pull the switches out of the housing with a small screw driver. Replace and your good to go...

It looked at first like failure of the middle of the three switches that sense the open/close status of the door. Replacing this restored function for a day or so, until the problem returned. I noticed that slight wiggling of the door could close and open this switch. Looking closely at the "lock" it appeared that the ramp that the door catches slid up were worn at the inside edge. The replacement part confirmed that the end of this ramp was worn. This apparently causes the sequence of switch closures to sometimes go wrong. It has only been a few days, but looks like replacing this part did the job. Why an expensive microwave would contain a part made of inadequate plastic, leading to failure in 5 years, is a good question.

Removing the top grill allows access to the control panel. 3 screws total. Carefully remove the connectors making sure you write down where each one goes. With the panel out of the way, two more screws allow the removal of the bracket that holds the three door switches, and allowing you to replace the faulty one. Each switch is held into the bracket by a plastic tab that when moved away will allow each switch to slide out. The broken one will be discolored or have a button that lost it’s spring. The switches are slightly different, so make sure you know which one to order. They operate in opposite function, ie open/closed circuit. There may be a schematic diagram that will help identify the correct function and location for ordering. If you are truly proactive, you might want to order and replace all three. Installation is easy, by simply reversing each step.

Microwave would trip the breaker when I would press start. So I looked on Google and found on Youtube which indicated it could be a door switch. "IMPORTANT I AM AN ELECTRICAL DESIGNER/ENGINEER THERE IS A CAPACITOR THAT HOLDS ELECTRIC ENERGY EVEN WHEN UNPLUGGED DO NOT DO THIS WORK UNLESS YOU KNOW WHAT YOU ARE DOING TO REMOVE THIS ELECTRIC ENERGY SAFELY" I took apart the microwave and behind the touch panel of the microwave was the wiring sheet. There are (2) switches on the door. I took a meter and check for continuity of the switches with door open and closed. What I saw in youtube was correct, it was the middle switch which is the door monitor. The bracket that these switches mount in seemed to have a broken clip on one of the switches. So I ordered all (3) new switches and the bracket with spare fuse. When parts came in, I replaced everything verified the switches worked correctly with my meter again then did a test before remounting. It worked! $50 buck vs 200+ for a service guy or more to replace microwave.