- Reaction score
- 52
Hi everyone
Commercial dishwasher stopped working. Water heats up but when the temperature reaches the right temperature the wash start button doesn't start the wash cycle. Checked everything out. Buttons, motors they all fine. Drain pump works but the behaviour is whacky. Normally you press the drain button and release it when you hear the drain pump kick in. The button powers a relay, the pump starts pumping, water drains, water pressure switch breaks circuit when the tank is empty and pump stops. Instead you press the drain button and the pump starts. You release the button and drain pump stops. You have to hold the drain button down to continue draining. Now here's the odd thing. As the tank drains with your thumb on the drain button it gets to a point, before the tank is empty, where the wash cycle begins and it does so even when the door is open ie: the door microswitch is being bypassed. I have a had a good look around for signs of short circuit but can't see anything. Opened up the loom. There's usually a bit of a clue if wiring looms are leaking. There is a relay contactor in the machine that sits between the timer and the various pumps. I am thinking the problem might be this contactor. What do you guys think?
Commercial dishwasher stopped working. Water heats up but when the temperature reaches the right temperature the wash start button doesn't start the wash cycle. Checked everything out. Buttons, motors they all fine. Drain pump works but the behaviour is whacky. Normally you press the drain button and release it when you hear the drain pump kick in. The button powers a relay, the pump starts pumping, water drains, water pressure switch breaks circuit when the tank is empty and pump stops. Instead you press the drain button and the pump starts. You release the button and drain pump stops. You have to hold the drain button down to continue draining. Now here's the odd thing. As the tank drains with your thumb on the drain button it gets to a point, before the tank is empty, where the wash cycle begins and it does so even when the door is open ie: the door microswitch is being bypassed. I have a had a good look around for signs of short circuit but can't see anything. Opened up the loom. There's usually a bit of a clue if wiring looms are leaking. There is a relay contactor in the machine that sits between the timer and the various pumps. I am thinking the problem might be this contactor. What do you guys think?