Bosch Cooktop U1 error code
Cooktop
Reviewed August 2025 · sources below
On Bosch cooktops, error U1 indicates: Input voltage is outside normal working limits. Start with a 5-minute power reset at the breaker, then follow the cooktop-specific checks below before ordering replacement parts for U1. If the code returns on two consecutive cycles after a reset, treat it as a confirmed fault — not a one-time power glitch.
Safe to keep using?
No safety issue
This is a status or lock code, not a hardware fault.
Likely causes
Input voltage is outside normal working limits.
Check: Press Power or Start/Pause to clear the code, then restart the cycle.
Est. cost: $0–$0
Electric dryers and ranges need both hot legs; a miswired cord reads as low voltage.
Check: Confirm the cord matches the outlet type and each hot wire is on the correct terminal.
Est. cost: $0–$150
What it means
Input voltage is outside normal working limits.
How to fix it
- Unplug the cooktop or turn off power at the breaker before inspecting any components.
- Reset Bosch U1: leave power off for 5 minutes, restore power, then restart. Confirm whether U1 returns.
- Check the most common cause for U1: Input voltage is outside normal working limits.
- Wipe the glass dry, move pans off the controls, and confirm the cookware is induction-ready and centered if the zone is induction.
- If a reset and basic checks don't clear the code, use our lookup tool for AI-powered diagnosis or contact a qualified technician.
- Reassemble, restore power, and run a test cycle. If U1 returns, the faulty component likely needs replacement.
Call a pro when: Call a technician if you smell burning, see sparking, hear grinding from the motor, or the code returns after replacing the suspected part.
Repair videos
FAQ
What does U1 error code mean on a Bosch cooktop?
Input voltage is outside normal working limits.
How do I reset Bosch cooktop U1?
Unplug the cooktop or switch it off at the breaker for 5 minutes, then restore power and restart. A reset clears a stored U1 after a glitch, but the code will return if the underlying fault is still present.
What part do I need for Bosch U1?
Not always — some U1 errors are caused by user-fixable issues like clogs or unbalanced loads. Try the troubleshooting steps first.
Can I fix Bosch error U1 myself?
Many U1 errors can be fixed DIY if you're comfortable with basic tools. Start with the reset and steps above. If the issue involves electrical components or the code returns after replacing parts, call a professional.
Other Bosch Cooktop codes
Prevent this problem next time
- Use lock features only when needed
- Avoid cutting power mid-cycle
Sources
Manufacturer meaning
Input voltage is outside normal working limits.
FixApplianceCode guidance
Clear the U1 status code and restart. No replacement part is needed.
Source type: Editorial
Source: FixApplianceCode status-code guidance
Last reviewed: 2026-08-24
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