NTC Fan Sensor Open Circuit
The F4 error code on your Miele Oven indicates ntc fan sensor open circuit. This is a High severity issue. The NTC temperature sensor for the convection fan has an open circuit. Found on older Miele H-series ovens. The sensor wire is broken or the thermistor has failed. What Does F4 Mean on a Miele […]
~5%
DIY Fixable
From $150
Typical Repair Cost
1–2 hrs
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Maybe. Non-fan heating modes may work. Fan-forced modes are disabled until the sensor is replaced.
Can I reset the code?
No. No — an open circuit requires sensor replacement.
When to stop immediately?
Stop if you notice: F4 is persistent — always needs repair.
Symptoms You May Notice
"F4" on the display
Appears when attempting convection cooking modes.
Fan-forced modes disabled
The oven will not operate in any convection mode.
Possible Causes
Fan NTC wire broken
The sensor wire has fractured from repeated heat cycling.
Requires ProfessionalFan NTC sensor failed
The thermistor has failed open.
Requires ProfessionalSafe Checks You Can Do
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1
Power cycle
Turn off at breaker for 5 minutes and restart.
This will not fix a broken wire but confirms the code is persistent.
When to Call a Professional
Contact a qualified Miele technician if:
- Fan NTC reads infinite resistance
- Sensor wire visibly damaged
Need Professional Help?
Find qualified Miele technicians in your area for proper diagnostics and repair.
Oven Repair Service Schedule Appointment