Bosch Dishwasher E03 — Water not heating
Bosch Dishwasher · Error code E03
What E03 Means
Heating circuit failed to reach target temperature within the allotted time. Similar to E02 but specifically a time-out rather than a sensor fault.
Most Likely Fix
Water fill / inlet issue
Tools: screwdriver, adjustable wrench, towel
Diagnose first: Check household water supply first; if open, inlet valve solenoid is most common failure.
Find this part on Amazon →If the primary fix doesn't resolve it:
Symptoms
- Cool wash water
- Cycle runs long then errors
- Dishes greasy after cycle
Common Causes
Hot supply valve closed, dishwasher cannot reach setpoint in time.
Element degraded but not fully open.
Insulation from mineral buildup slowing heat transfer.
NTC reading high, ending heat cycle early.
How to Fix It
- Verify the hot water supply valve under the sink is fully open.
- Run hot water at the sink for 30 seconds before starting the dishwasher.
- Check incoming water temperature with a thermometer (target 120 deg F).
- Inspect the heater for visible scale buildup; descale with citric acid cycle.
- If heater resistance is high or NTC is drifted, replace those components.
Parts You May Need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
More Bosch Dishwasher Codes
Verified against manufacturer documentation: bosch-home.com
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.