High-frequency cheeping or ticking when heating is requested in the instrument panel area
Mercedes-Benz technical service bulletin LI83.20-P-079911 for 2026 Mercedes-Benz Cla 250+ (EV) and 2026 Mercedes-Benz Cla 350 4matic (EV).
- Bulletin number
- LI83.20-P-079911
- Component
- Visibility/wiper
- Summary
- Complaint High-frequency cheeping or ticking when heating is requested in the instrument panel area. Cause Variable switching frequencies in the high-voltage on-board electrical system can cause vibrations that lead to noise complaints on the HV-PTC N33/16 (air heater). Remedy Note: Replacing the hardware does not solve the problem at present! Modified hardware for the HV-PTC (air heater) will be available from the beginning of 2026.
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