FixByModel
E01

Bosch E01: Heat-pump / control board circuit fault

Bosch reports E01 as a heat-pump motor circuit fault at the main control board (on some models tied to the drying/heat system). It often clears with a power reset, but a persistent E01 points at the control module or heat pump.

May need a technician

By the FixByModel editorial team · Verified 2026-09 · Researched against manufacturer support & repair references (below)

Most likely causes

  1. Transient control-board glitch, often after a power outage
  2. Heat-pump motor circuit fault on the main control board
  3. Cold incoming water preventing the heater cycle from completing
  4. Failed or stalled heat-pump/drying motor on models with that feature
  5. Main control board (power module) failure
Before you start — unplug the appliance and turn off the water supply. You'll be working near water and electrical parts, and drained water can be hot. If a step involves the pump, wiring, or opening the cabinet and you're unsure, stop and call a qualified technician.

Step-by-step fix

1Reset powerSwitch the dishwasher off at the breaker for about 30 seconds, then restore power to clear a false code.
2Supply hot waterRun the kitchen faucet until hot before starting, since Bosch machines expect incoming water around 120°F (49°C).
3Run a test cycleStart a normal cycle and watch whether E01 returns immediately or only later in the program.
4Call for serviceIf E01 persists, contact Bosch support or a technician, as a control-board or heat-pump repair is likely needed.

Still showing E01?

If you’ve worked through every step and E01 keeps returning, an internal part likely needs testing and replacement. That’s a job for a qualified appliance technician, who can measure the suspect part against the service-manual spec before replacing it.

Which models this applies to

Bosch dishwashers. Bosch dishwashers with digital fault display; heat-pump wording applies to models with active/zeolite drying, otherwise a control-board power module fault.

FAQ

What does Bosch E01 mean?

Heat-pump / control board circuit fault. Bosch reports E01 as a heat-pump motor circuit fault at the main control board (on some models tied to the drying/heat system). It often clears with a power reset, but a persistent E01 points at the control module or heat pump.

What causes Bosch E01?

The most likely cause is transient control-board glitch, often after a power outage. Other causes include Heat-pump motor circuit fault on the main control board; Cold incoming water preventing the heater cycle from completing; Failed or stalled heat-pump/drying motor on models with that feature; Main control board (power module) failure.

Can I fix Bosch E01 myself?

Some checks are DIY, but this code often points to an internal component, so it may need a qualified technician.