Error code reference
Bosch Oven Error Code E309
ROM-check error in control module
ROM-check error in control module — ROM-check performed at reset fails; all heating elements disabled.
First step from the service manual
Replace control module.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
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- 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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