FixByModel
E02

Bosch E02: Temperature sensor / control relay fault

E02 signals a temperature-sensing or control-relay problem, typically a faulty NTC temperature sensor or its wiring. The control stops the cycle when it cannot read reliable water-temperature data.

May need a technician

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

Most likely causes

  1. Faulty NTC (temperature) sensor — most common
  2. Damaged or loose wiring between the sensor and control board
  3. Main control board relay fault
  4. Control module failure (rare)
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 powerTurn the dishwasher off at the breaker for about 30 seconds and restart to rule out a temporary error.
2Run a test cycleStart a cycle and see whether E02 reappears, which indicates a real sensor or wiring fault.
3Test the NTC sensorHave the NTC sensor and its wiring checked/measured before buying parts, since the sensor is far cheaper than the board.
4Replace the faulty partReplace the NTC sensor or repair the wiring; if those are good, a technician should evaluate the control board.

Still showing E02?

If you’ve worked through every step and E02 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 using an NTC water-temperature sensor (current Bosch dishwasher ranges).

FAQ

What does Bosch E02 mean?

Temperature sensor / control relay fault. E02 signals a temperature-sensing or control-relay problem, typically a faulty NTC temperature sensor or its wiring. The control stops the cycle when it cannot read reliable water-temperature data.

What causes Bosch E02?

The most likely cause is faulty ntc (temperature) sensor — most common. Other causes include Damaged or loose wiring between the sensor and control board; Main control board relay fault; Control module failure (rare).

Can I fix Bosch E02 myself?

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