E42
Bosch Dishwasher
Severity: ModerateWhat Does This Error Mean?
The E42 error on a Bosch dishwasher indicates a motor start fault — the wash circulation motor failed to start within the expected time. The control board sent the command to start the motor but it did not respond correctly. This is usually a motor, capacitor, or wiring issue.
Affected Models
- SHPM88Z75N
- SHPM65Z55N
- SHEM63W55N
- SHDX5EM3N
- Most Bosch 500, 800 series dishwashers
Common Causes
- Circulation motor has seized or failed to start due to age or heat damage
- Motor start capacitor has failed, preventing the motor from getting the initial start boost
- Foreign object lodged in the pump impeller preventing rotation
- Wiring harness to the circulation motor is damaged or has a loose connection
- Control board relay that powers the motor has failed
How to Fix It
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Turn off the dishwasher at the circuit breaker and wait 10 minutes.
A full power reset allows the motor capacitor to discharge and reset. This sometimes resolves a temporary start fault.
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Clean the drain filter and sump area completely.
Debris in the pump area can jam the impeller and prevent the motor from starting. Remove the filter and clean everything thoroughly.
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Restore power and listen when the dishwasher tries to start.
If you hear a brief hum then silence, the motor is trying to start but failing — the capacitor or motor is likely faulty.
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If the dishwasher starts silently without any motor sounds, the motor may not be receiving power.
This points to a wiring or control board relay issue rather than a motor fault. A technician can diagnose this quickly.
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Call a technician to test the motor capacitor and wiring.
The motor start capacitor is an inexpensive part ($10–$30) but requires access to the motor assembly. If the motor itself has seized, a full motor replacement is needed.
When to Call a Professional
E42 almost always requires a technician. A failed motor start capacitor or seized motor needs professional diagnosis and replacement. Expect repair costs of $150–$300 depending on whether the capacitor or full motor needs replacing.
Frequently Asked Questions
What is a motor start capacitor and why does it fail?
The start capacitor gives the motor an extra burst of electrical energy to get it spinning from a standstill. Without it, the motor cannot overcome the initial resistance and just hums. Capacitors degrade over time and can fail after years of use. Replacing one is an inexpensive fix if caught early.
Is E42 repairable or does the dishwasher need replacing?
Most E42 errors are repairable at a reasonable cost. A failed capacitor is a $10–$30 part plus labor. Even a full motor replacement is typically $150–$250 — much cheaper than a new dishwasher. Only consider replacement if the machine has multiple other issues or is very old.
Can I prevent E42 from happening?
Not entirely, since capacitors and motors simply wear out over time. However, keeping the filter clean prevents debris from jamming the impeller and straining the motor. Avoiding overloading the dishwasher (which makes the pump work harder) also helps extend motor life.