Bosch Dishwasher Error Code E19 — Heat Exchanger Fault
What this means
The E19 error indicates a problem with the heat exchanger, which uses residual heat from the wash cycle to pre-warm incoming water and improve drying efficiency. A faulty valve, blocked water line, or failed sensor in the heat exchanger circuit can trigger this code.
Step-by-step fix
2 stepsPower cycle the dishwasher
Turn off the breaker for 5 minutes and restart. Run a normal cycle to see if the error clears.
Temporary sensor glitches in the heat exchanger system can sometimes be cleared with a reset.
Check for blockages
Inspect the water lines leading to and from the heat exchanger for kinks or blockages.
The heat exchanger is typically located behind the left side panel of the dishwasher.
When to call a professional
Heat exchanger diagnosis and repair requires specialized knowledge of Bosch's Zeolite or ActiveWater systems. Professional service is recommended.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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