Bosch Range Hood SWITCH-FAIL Error: Speed Control Failure
Bosch Range Hood: Speed Control Failure When a Bosch range hood fan is stuck on one speed or won’t change settings, the speed switch or electronic controller has malfunctioned. Try a power cycle first. If speeds still don’t change, the switch or control board needs professional replacement.
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Yes. The hood is safe if the fan runs at any speed. The inconvenience is being stuck on one speed setting.
Can I reset the code?
Yes. Power cycling may resolve an electronic speed controller glitch.
When to stop immediately?
Stop if you notice: Fan won't turn on at all, Switch sparks when pressed.
Symptoms You May Notice
Speed settings don't change
Pressing different speed buttons has no effect — the fan stays at one speed or won't respond.
Fan stuck on high or low
The fan runs at only one speed regardless of the setting selected.
Possible Causes
Faulty speed switch
The mechanical or electronic speed switch has failed.
Requires ProfessionalControl board fault
The electronic speed controller on the main board has malfunctioned.
Requires ProfessionalSafe Checks You Can Do
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1
Power cycle the hood
Turn off the hood and the circuit breaker for 2 minutes, then restore power.
Electronic speed controllers can sometimes recover from a power cycle.
When to Call a Professional
Contact a qualified technician if:
- Switch contacts worn
- Speed controller circuit failed
- Wiring to switch damaged
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
Range Hood Repair Service Schedule Appointment