The E01 error on your Bosch dishwasher points at a pump-control or heating-circuit failure on the main control board. A 30-second breaker reset clears one-off glitches; if E01 returns, the main control module typically needs replacing.

Error code E01
Meaning Pump control or heating-circuit fault on the main control board
Severity High — limited DIY scope
Time to fix 5 min reset; otherwise technician
Tools needed None for reset

What the E01 error means

The main control board has dedicated circuits for the pump and heating element. When one of those circuits fails — short, open, or the Triac driving it has died — the dishwasher can’t run safely and shows E01. Some models also throw E01 when the water supply is too slow (because the heater can’t run with insufficient water), but the underlying cause is usually the board itself. E01 to E04 are all variants on the same family of control-board faults.

Common causes

  • Faulty pump or heater Triac on the main control board (most common)
  • Short-circuited or open pump or heating element
  • Insufficient water entering the dishwasher
  • Door latch switch fault
  • Power interruption damage after a storm or breaker trip
  • Loose wiring between the board and the pump/heater

How to fix the E01 error

  1. Reset at the breaker for 30 seconds. Bosch’s published first step is a 30-second mains-side reset. Switch off the breaker, wait, switch back on. Many one-off E01 codes clear here.
  2. Check the water supply. Confirm the supply valve is fully open and the inlet hose isn’t kinked. Inspect the inlet filter screen at the connection. Low water flow can produce E01 on some models.
  3. Inspect the door latch. Make sure the door closes firmly and the latch engages cleanly. A failing latch can produce intermittent E01.
  4. Confirm the inlet valve isn’t damaged. If the valve has failed, water won’t fill at the right rate. Replacement is a $30–$60 part.
  5. If E01 returns, the main control module needs replacing. That’s a Bosch-trained technician job — board replacement involves wiring up the dishwasher to a new module and registering it. Don’t attempt without the right service documentation.

FAQ

Can I just buy and fit a new control board myself?
On most Bosch models, the new board has to be paired with the appliance via a service tool. A homeowner-fitted board often won’t work even if the wiring is correct. This is one of the few faults where a technician is genuinely necessary.

Is E01 the same as E02?
Same family — both indicate control-board faults. E01 is most often pump/heater Triac; E02 is similar but may point at a different sensor. Both are typically resolved by board replacement.

Could a power surge cause E01?
Yes — surges and brownouts after storms or breaker trips frequently kill the Triacs on Bosch control boards. A surge protector on the dishwasher circuit reduces the risk.