Make it Start with a Door Switch Dishwashing Machine Repair
You wouldn't even know your dishwashing machine had one until it isn't working. These little switches are tucked inside the control panel of your dishwashing machine and most times are a part of the door lock. The door latch pulls the door safely to the primary body of your dishwasher and prevents water from leaking during a cycle. If your dishwasher does not start, it could be due to a malfunctioning door switch.
How the door switch works
When the dishwasher door is open, the switch is off. Inside your dishwasher tub will be a metal or plastic prong. Close and lock the canberra plumbing tips door. The prong will depress the door switch entirely and the circuit will close permitting the dishwashing machine to start. Inspect Canberra plumbing news article the prong to ensure it's not loose or bent and it's correctly activating the door switch.
It is very important to disconnect the dishwashing machine from its source of power before trying any repair work. You can unplug the dishwasher from the outlet, remove the fuse from your fuse box, or flick the breaker turn on your circuit panel. This will prevent you from getting an electric shock.
What a door switch looks like and where it's located
Typically a dishwashing machine door switch is an inch long. It can be black or red and has actually metal prongs called terminals extending from the body. Some door switches have 2 terminals and some have three.
The terminals can be a typical terminal (COM), typically closed terminal (NC) or an usually open terminal (NO). Switches with just two terminals will either have a COM and a NO, or a COM and an NC. Door changes with 3 terminals have COM, NC, and a NO.
Your dishwasher's door switch will lag the control board on the front of the unit. It might be necessary to get rid of the inner panel of the door first. You can do this by getting rid of a couple of screws. The screws at the bottom of the door are for the hinges. You do not need to get rid of the whole door for this repair.
Once the inner panel is removed you may find another smaller panel covering the back of the control panel held in place with screws or clips. By removing this panel you will access to the lock assembly housing the door switch.
How to eliminate the switch
Carefully usage needle nose pliers to pull the wires leading from the harness off the terminals. For door changes that have a locking clip, depress the lever as you gently pull the harness far from the terminal.
Take your time while removing switches that belong of the latch assembly or that have a bracket. If you rush and break the switch's housing you will end up having to change more parts.
How to test your door switch
Use an ohmmeter to evaluate the switch for connection. This test is for door switches with three terminals.
1. Set your ohmmeter to determine resistance at a scale of Rx1.
2. Touch the metal pointers of the test leads together and zero your ohmmeter by changing the thumbwheel in the front of the meter until the needles checks out "0" on the scale.
3. Touch one meter cause the COM terminal and the other cause the NO terminal. Do not push in on the actuator.
4. Your meter should provide a reading of infinity, meaning the circuit is open, and there is no continuity.
5. Without moving the meter's leads, press down on the actuator until you hear a 'click'.
6. With the 'click' of the actuator, the meter should produce a resistance reading of no ohms. This means the circuit is closed and continuity exists. (You will only hear this click with a door switch with three terminals.)
7. Keep the meter lead that is touching the COM terminal in location, however move the other meter lead from the NO terminal to the NC terminal.
8. When the actuator is launched, you ought to receive a resistance reading of no ohms.
9. Now set your ohmmeter to its greatest resistance scale and touch one meter lead to the NO terminal and the other meter lead to the NC terminal.
10. The resistance reading between these 2 leads must be infinite.
11. Finally take a resistance reading from both the NC terminal and the NO terminal to any metal installing hardware that is a part of the switch assembly. You must get a normal reading of infinity.
Any readings that differ from the tests above are indications of a defective door switch that will need to be replaced.
Replace the old switch with a brand-new one, utilizing the same process as discussed above. Reassemble the inner door panel and reconnect your dishwasher to its power supply. Do not forget to change your fuse or turn the breaker switch back on. Run your dishwasher through a cycle to make sure it's working correctly.