EN

Severity: Moderate

Bosch Dishwasher Error E01 – Control Board Fault – Heat Pump Circuit

The main control found a fault in the circuit that powers the heat pump. Start with a breaker reset.

At a glance

Severity: 3/5 – Moderate3/5

Severity: Moderate

Meaning
Control Board Fault – Heat Pump Circuit
Typical repair cost
$0–$950
DIY difficulty
Hard

Bosch defines E:01 as a heat pump motor circuit fault at the main control board. In other words, the problem is on the electronics side: the relay or switching circuit that sends power to the heat pump (the combined circulation pump and heater) isn't behaving the way the board expects. That separates it from E:09, where the heater inside the pump has failed, and from E:27, where the house supply is too weak. Bosch's first step is a 30-second breaker reset; a one-off spike or glitch clears that way, while a failed relay or a board damaged by moisture brings the code straight back.

How it looks on the display

Bosch Dishwasher display showing error E01

Model families & display variants

Model familyShowsNote
100, 300 and 500 SeriesE:01Shown on the top-of-door display.
800 Series and BenchmarkE:01Same meaning; the code belongs to the group E:01 to E:05 that points to the electronics.
Older Bosch modelsE01No colon; same meaning.

Safety first · Consult a professional

Always switch off the breaker before removing the toe kick or pulling the dishwasher out. The control and power electronics carry line voltage even when the display is dark.

  • Unplug the appliance or switch off the breaker before opening any panel. Mains voltage can kill.

Symptoms

  • E:01 right after start or when the cycle should begin heating
  • Clicking from behind the toe kick, then the cycle stops
  • Water stays cold, dishes come out dirty and wet
  • Code clears after a breaker reset but returns within a few cycles
  • Earlier leak (E:15) or water under the unit before E:01 appeared

Possible causes

Ranked by how often each cause is behind this code (editorial estimate).

  1. Relay or triac for the heat pump on the control/power module failed 35%
  2. Moisture or corrosion on the module after a leak or steam escape 15%
  3. Loose or scorched connector between the module and the heat pump 15%
  4. Heat pump with an internal short overloading the control circuit 15%
  5. Voltage spike or brownout that confused the control 12%
  6. Software lock-up in the control electronics 8%

Fix it step by step

Diagnostic flow: E011Do Bosch's reset2Note the timing3Rule out supply problems4Check for past leaks5Let a technician test the circuit

  1. Do Bosch's reset

    Hold Start for 3 seconds, then turn off the dishwasher's breaker for at least 30 seconds and restore power. Run a normal cycle and stay nearby for the first 15 minutes, which is when heating begins.

  2. Note the timing

    Record whether E:01 appears immediately at start or only once heating should begin. A code at the very start leans toward the board; a code at the heat step leans toward the heat pump circuit.

  3. Rule out supply problems

    Make sure the unit isn't on an extension cord and that nothing else heavy runs on the same circuit. Lights that dim at the heat step mean the house wiring needs attention first.

    Tools: Flashlight

  4. Check for past leaks

    With the breaker off, remove the toe kick and look for water marks, scale or rust on the base and around the electronics. A module that got wet often fails with E:01 weeks later.

    Tools: Screwdriver, Flashlight

  5. Let a technician test the circuit

    The technician measures the heat pump for shorts and checks the output from the board under load. That decides whether the module, the pump, or both need replacing, which avoids buying an expensive board that the pump would damage again.

    Tools: Multimeter

How to reset E01

  1. Press and hold Start for about 3 seconds to cancel the cycle.
  2. Switch off the breaker for at least 30 seconds, then switch it back on.
  3. Start a normal cycle; if E:01 returns, call Bosch service rather than resetting repeatedly.

Where the parts are

Dishwasher: filter, drain pump and sump – E01123456789
Dishwasher: filter, drain pump and sump
  1. 1Door lock
  2. 2Water inlet valve
  3. 3Filter
  4. 4Circulation pump
  5. 5Heating element
  6. 6Drain pump
  7. 7Float switch
  8. 8Temperature sensor
  9. 9Water level sensor

Repair options & costs

RepairDIY?Estimated cost
Breaker reset Yes $0
Repair connector/harness to the heat pump No $150–$280
Replace control/power module No $350–$650
Replace heat pump plus module No $600–$950

Rough US estimates; technician call-out fees vary by region. Not a quote.

When to call a technician

Call Bosch service if E:01 comes back after the 30-second breaker reset, especially if there was ever a leak under the unit. Repeated resets won't repair a failed relay, and a technician should check the heat pump for a short before a new board goes in.

Frequently asked questions

Is E01 the same as E09?

No. E:09 points at the heater inside the heat pump. E:01 points at the control side that switches power to the heat pump, although a shorted pump can trigger both.

Can a power outage cause E01?

A surge or brownout can make the control show E:01 once. If it clears after a breaker reset and doesn't return, nothing needs replacing.

Is it worth fixing an older Bosch with E01?

A control module plus labor is a significant repair. On an older unit, get the diagnosis and quote first, then compare it with the price of a new dishwasher.

Can I replace the control module myself?

Only if you are comfortable with line-voltage wiring and pulling the unit out. The module must match your exact model and may need to be the correct software version, so most owners leave it to service.

Sources