Bosch Oven Error Code E303
Electronics delta temperature too high
Electronics delta temperature too high — temperature sensor on control module detects temperature changes that over time are higher than limit value; control turns off heating elements and fan defaults to high speed.
First step from the service manual
Check connections to cooling fan and to control module (see Small Load Schematic). Check element operation. Check for air obstruction or damaged upper/lower ventilation trims. Check for stuck relays.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
Get the full diagnostic procedure for E303.
- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts from the OEM service manual
- Verified part numbers when replacement is required
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