Bosch Microwave Error Codes

9 error codes for Bosch microwave models. Each links to the full diagnostic procedure from the service manual.

CodeDescription

E1Thermistor open circuit detected.E17Preheat fail E2Safety time was reached; oven is in off condition.E3Damper function failed.E4Thermistor short circuit detected.F-4Humidity sensor self-heating time exceeds 64 seconds or zero balancing voltage…H97Self-diagnostic failure code indicating a magnetron and/or inverter circuit…H98Self-diagnostic failure code indicating a magnetron and/or inverter circuit…H99Self-diagnostic failure code indicating a magnetron and/or inverter circuit…

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M+

M+ Max·Bosch Microwave

E1 on my Bosch Microwave

M+

Thermistor open circuit detected

From Service Manual 228316, p.48:

1.If detected, unit reverts to plug-in mode; display shows error code for 3 seconds. Check thermistor and wiring for open circuit.

2.Disconnect the sensor and measure resistance at the sensor body. Expected: 10 kΩ to 12 kΩ at 77°F (25°C).

3.Check the sensor harness for opens and shorts. Back-probe the sensor pins at the control board connector; a reading outside 5 kΩ to 50 kΩ indicates a failed sensor.

Part 00617955

Temperature sensor (NTC)

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