Cove · Dishwasher error code

20 01 29Heater (HTR1) did not reach temperature

Cross-checked High-voltage / caution

Unlock what this code means, its causes, tests and parts

Full library + AI assistant + the OnCall Tech app for iPhone & Android. $34.90, one time.

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 'Sanitized' light won't come on or flashes

The sanitized indicator only lights when the control measured that the water reached its sanitizing temperature and held it. When it fails, the water did not get hot enough or the cycle was interrupted. Check incoming hot water first (at least 120 F at the sink), then door openings and power interruptions, then the heater, thermistor and the control's heater circuit.

5 steps ~45 minmoderate

Guide · Dishwasher

Bosch / Thermador / Gaggenau dishwashers: E-codes, resets and the stored-fault test program

Current BSH dishwashers show E-codes on the display; Bosch's own pages tie E24 to a drain problem and E15 to water in the base (leak protection). A reset is a power cycle or holding Start for a few seconds, which cancels the program and pumps out. Older models have a test program entered by holding two program buttons while switching on; it shows stored faults as numbers that add together (1, 2, 4, 8, 16), so a 3 means faults 1 and 2.

7 steps ~30 minmoderate

Guide · Dishwasher

Field pattern: Bosch dishwasher E09 / no heat (the heater is inside the circulation pump: check terminals and sensors before buying the assembly)

On most Bosch-built dishwashers the heater is built into the circulation pump housing (the 'heat pump'), so there is no visible element. E09 is tied to the heating circuit: the heater itself, its terminals, the temperature/flow sensing or the control's heater relay. The wrong turn is hunting for an element in the tub, or buying the heat pump assembly without measuring the heater and checking its connector for corrosion.

7 steps ~75 minadvanced