Bosch Dishwasher E:01: Cycle Ended Early, Heater Relay or Pump Unconfirmed

What E:01 means

You hear the machine wind down sooner than expected and find dishes only partly washed, with E:01 on the display. The colon marks a newer Bosch platform, not the old E01. The control tried to verify the heater relay and both pump circuits, could not, and ended the wash early to protect them. The listed triggers are a failed relay, a pump that is unplugged or failing, or voltage that sags under load.

Common causes of E:01

Supply voltage sagging because the dishwasher shares a circuit (cheapest to rule out first, and common after a brownout or storm-season power dip in Houston)
Heat pump or drain pump disconnected, or its harness damaged
Heat pump heater relay failed inside the power module

✓ One safe check you can try

1. Switch the dishwasher off at the breaker. 2. Work out what else is wired to its circuit; a disposer or microwave on the same line can drag the voltage down. 3. If the circuit is shared, run the dishwasher while those are idle. 4. Leave the base closed, since relay and pump checks need bench measurements. Call us if E:01 returns.

! Why to stop there

Reaching the power module means pulling a wet appliance that is anchored to the counter.
Pump resistance readings depend on the exact pump installed; without them a healthy pump gets replaced for nothing.
Low voltage and a failing pump show the same display, so guessing risks paying for a module you did not need.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Dishwasher codes

E:30Bosch Dishwasher E:30, Voltage Too High and the Machine Shut Down E:31Water in the Zeolite Container - Bosch Dishwasher E:31 FBosch Dishwasher F on an Older Display (Water Filling) 2HBosch Dishwasher 2H: Long Cycle Warning on Older Displays 1Bosch Dishwasher Service Test Result 1: Aqua Sensor 2Bosch Dishwasher Service Test Result 2: Heating Group 4Bosch Dishwasher Service Test Result 4: Water Filling 8Bosch Dishwasher Service Test Result 8: Temperature Sensor

E:01E:01 questions

Does E:01 mean the same as E01?

No. The colon version belongs to the newer platform and relates to the relay and pump circuits. The plain E01 is a heating-time problem on earlier machines.

Will a reset fix it?

Only if low voltage was the trigger and has passed. If the relay or a pump is the cause, the code returns. Rule out the shared circuit first, then call us.

Is my newer dishwasher still under manufacturer coverage?

It may be. Check your purchase date and terms before anyone opens the base. Our repair carries a 30-day workmanship warranty, with a written price agreed before any work.