Thermador · Dishwasher error code

E27Supply voltage too low

Single source High-voltage / caution

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OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

Related diagnostic guides

Guide · Dishwasher

Dishwasher completely dead: no lights, no response (supply, door switch, thermal fuse)

Prove supply voltage at the junction box with a meter before blaming any part. Then check the door switch circuit and, on units that have one, the one-time thermal fuse near the control. Replace the control board only after these pass.

8 steps ~45 minmoderate

Guide · Dishwasher

Dishwasher cycle runs too long or stalls

Most long cycles are the control waiting for heat (cool supply, bad heater or thermistor) or a soil sensor reading dirty water. Check water temperature, then clean the turbidity sensor, then test thermistor and heater.

5 steps ~45 minmoderate

Guide · Dishwasher

Loud bang or knock in the pipes when the dishwasher fills or stops filling

The dishwasher's solenoid inlet valve closes fast, and in a high-pressure or loosely strapped line the water slams to a stop (water hammer). The fix is usually on the plumbing side: lower the pressure, add an arrester on the supply side of the valve, and secure the pipes. A valve that chatters can also be at fault.

6 steps ~45 minmoderate