Bosch dishwasher E20 points to internal heat-pump heater fault. Start with the safe checks that apply to this system and stop if the warning returns.
Model compatibility: Bosch reuses codes across series and model years, so E20 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
The verified Bosch meaning for E20 is internal heat-pump heater fault. Treat that wording as the technical anchor for this page. The displayed code narrows the system that needs attention, but the complete E-Nr and observed behavior are still important before a repair decision is made.
Signs
Symptoms you may notice
water may not heat as expected
drying performance can change
the cycle may pause or end early
the code can return after a restart
Why it happens
Possible causes
heater or heat-pump heating fault
temperature/heating control fault
wiring or electronic switching fault in the heating path
Before you call
Safe checks you can make
These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.
Record the code and full E-Nr/model number.
If Bosch permits a normal breaker reset for this code, switch power off for about 30 seconds and restore it once.
Do not test the heater, live wiring, or control board from inside the appliance.
Important safety warning. Keep the dishwasher off if there is overheating, electrical odor, smoke, or repeated power interruption.
Get help
When to call a technician
If the warning returns, internal heating, sensing, wiring, and control components need model-aware testing. When requesting service, include the complete Bosch model/E-Nr. Similar-looking dishwashers can use different controls, pumps, drying systems, and diagnostic logic.
Seeing this code on your Bosch appliance?
Book a specialist visit for a clear estimate and approval before any repair.
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Request an appointment with your appliance model and symptom. We confirm a visit window, diagnose on site, then give a clear estimate. Approved work only proceeds after you agree.
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