Bosch Microwave ER1 Error: Temp Sensor Faulty
What Does Bosch Microwave Error Code Er1 Mean? Error code Er1 indicates the oven cavity temperature sensor has failed. Standard microwave mode is safe to use. Avoid convection and combo modes until a technician replaces the sensor.
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Maybe. Safe in microwave-only mode. Do not use convection or combo modes.
Can I reset the code?
No. The sensor hardware must be replaced.
When to stop immediately?
Stop if you notice: Burning smell during any mode, Sparking inside the cavity.
Symptoms You May Notice
No temp regulation in convection mode
Convection cooking doesn't maintain the set temperature — food burns or stays raw.
Overheating risk in combo mode
Without accurate sensing, the microwave/convection combo can overheat.
Possible Causes
Failed NTC sensor
The temperature sensor has failed.
Requires ProfessionalSafe Checks You Can Do
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1
Use microwave mode only
Standard microwave mode doesn't rely on the temperature sensor and is safe to use.
Avoid convection and combo modes until the sensor is replaced.
When to Call a Professional
Contact a qualified technician if:
- Sensor has open or short circuit
- Sensor resistance wrong
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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