Bosch Oven ER1 Error: Temp Sensor Failure
What Does Bosch Oven Error Code Er1 Mean? Error code Er1 indicates the temperature sensor has failed. The oven cannot regulate temperature, which means it either won’t heat or could overheat dangerously. Immediate Action If the oven is overheating, turn off at the circuit breaker immediately. Do not use the oven until the sensor is […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. Without temperature regulation, the oven is unsafe. Do not use.
Can I reset the code?
No. Er1 is a hardware failure. The sensor must be replaced.
When to stop immediately?
Stop if you notice: Immediately if oven is overheating, Oven doesn't preheat at all.
Symptoms You May Notice
Oven doesn't preheat
The oven does not reach the set temperature even after an extended waiting period.
Oven wildly overheats
Without proper sensing, the oven may heat far beyond the set temperature.
Possible Causes
Failed temperature sensor
The resistance-based temperature sensor has failed open or shorted.
Requires ProfessionalSensor wiring damage
High heat has damaged the wire insulation connecting the sensor to the board.
Requires ProfessionalSafe Checks You Can Do
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1
Turn off the oven
If the oven is overheating, turn off at the breaker immediately.
An oven without temperature control is dangerous.
When to Call a Professional
Contact a qualified technician if:
- Sensor resistance reads open circuit or zero
- Wiring shows heat damage
- Board detects no sensor signal
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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