Match the symptom, then work through the safe checks.
1. What best matches what you observe?
2. Complete only the checks that are safe for you.
Show stop conditions
- E01 returns after the single Bosch 30-second reset
- A breaker trips, wiring smells hot, or electrical damage is visible
- Diagnosis requires access to the heat-pump motor circuit or main control board
Likely causes
- The main control board is not driving or sensing the heat-pump motor circuit correctly
- A connection between the control and heat-pump motor circuit is abnormal
- The heat-pump motor circuit presents an electrical condition the control identifies as E01
- A transient control fault remains after a power interruption and needs one controlled reset attempt
Quick checks, in order
Record E01 exactly
Do not merge E01 with E02 or a generic pump code. Bosch specifically identifies E01 as the heat-pump motor circuit at the main control board.
Reset the breaker for 30 seconds
Use Bosch's published user-level step: remove power at the breaker for about 30 seconds, restore it, and retry once.
Listen for the circulation stage
Without opening the appliance, note whether the code returns as the dishwasher attempts circulation. This observation can help service identify the affected circuit.
Stop before control-board or motor-circuit testing
E01 concerns internal powered components. Do not probe the heat-pump motor circuit, control outputs, or energized wiring unless qualified.
Does E01 return when the dishwasher attempts to run the heat-pump motor circuit?
Run one normal cycle and monitor. If it returns, document the cycle stage and arrange model-specific service.
That timing is consistent with Bosch's heat-pump motor circuit definition. Further diagnosis belongs at the motor circuit/control-board interface.
Stop use immediately and disconnect power if safe. Do not repeat resets on an electrical fault with these symptoms.
Stop and get qualified help when
- E01 returns after the single Bosch 30-second reset
- A breaker trips, wiring smells hot, or electrical damage is visible
- Diagnosis requires access to the heat-pump motor circuit or main control board
Official support and model manuals
Use the full model number from the rating label. The manufacturer manual is the deciding reference when codes differ by region or product family.
Frequently asked questions
What does Bosch dishwasher E01 mean?
Bosch states that E01 is a heat-pump motor circuit fault at the main control board.
Is Bosch E01 the same as E02?
No. Bosch lists E01 for the heat-pump motor circuit at the control board and E02 for a main control board relay fault/error.
Should I replace the heat pump because of E01?
Not from the code alone. Bosch's wording points to the motor circuit at the main control board, so the exact model's motor, wiring, connections, and control interface need diagnosis before parts replacement.