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Bosch Dishwasher won't start

If your Bosch dishwasher won't start, the most likely causes are a blown thermal fuse, a bad door switch, or a damaged wire harness that is not sending power from the control board to key components. A broken door latch is another common reason, since the dishwasher will not run if the door is not fully latched and the switch does not register closed. If those parts check out, the main control board could be at fault, though control boards are often misdiagnosed, so it makes sense to rule out the simpler failures first. On some Bosch models, a faulty drain pump can also keep the cycle from starting because the machine may try to drain before it begins filling. If your dishwasher has power but will not start, or the start button seems to work but the dishwasher is not starting, testing these parts with a multimeter is usually the fastest path to the problem. Enter your model number on RepairClinic.com to find the exact Bosch thermal fuse, door switch, wire harness, door latch, main control board, or drain pump that fits your dishwasher.

01 - Bosch Dishwasher Thermal Fuse

The thermal fuse shuts off power to the dishwasher if it overheats. If the thermal fuse blows, it will prevent the dishwasher from starting. To determine if the thermal fuse is defective, use a multimeter to test the fuse for continuity. If the thermal fuse does not have continuity, replace it.
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02 - Bosch Dishwasher Door Switch

The door switch prevents the dishwasher from running while the door is open. If the door switch is defective, the switch will prevent the dishwasher from running even when the door is closed. To determine if the door switch is at fault, use a multimeter to test the switch for continuity. If the switch does not have continuity, replace it.
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03 - Bosch Dishwasher Wire Harness

If the dishwasher start button appears to work, but the dishwasher still won't start, a wire harness which sends power from the control board to the pump components could be damaged. Inspect the wire harness for any frayed or broken wires and replace if necessary.
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04 - Bosch Dishwasher Door Latch

The door latch ensures that the dishwasher door latches shut. If the door does not latch properly, the door switch might prevent the dishwasher from running. If the door latch is broken, replace it.
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Highly Likely

05 - Bosch Dishwasher Main Control Board

The main control board provides power to nearly every component of the dishwasher. If there is a problem with the main control board, it might not send voltage to the dishwasher, causing the dishwasher not to start. Control boards are often misdiagnosed—make sure you check more commonly defective parts before replacing the main control board.
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Highly Likely

06 - Bosch Dishwasher Drain Pump

A dishwasher drain pump assists in removing the water from the tank at various times during operation. Since the unit will drain some water from the tank prior to the fill cycle beginning, a faulty drain pump unable to drain any water could prevent the dishwasher from starting.
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Highly Likely

Frequently Asked Questions

Why won't my Bosch dishwasher start even though it has power?
How do I know if the door latch or door switch is keeping my Bosch dishwasher from starting?
Can a blown thermal fuse keep a Bosch dishwasher from starting?
Can a bad drain pump stop a Bosch dishwasher from starting a cycle?
How do I find the right Bosch dishwasher part for my model?

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