C18
Bosch EasyControl
Internal Humidity / Air Quality Sensor Fault
Bosch EasyControl shows error C18 and reports that the internal humidity or air quality sensor (if present) is malfunctioning.
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Possible Causes
Sensor contamination by dust or moisture, Internal sensor electronics failure, Firmware misreading sensor data, Installation in high-humidity environment (e.g., bathroom)
How to Fix / Troubleshooting
Safety first: Do not open the EasyControl casing.
- 1. Check location: Ensure the EasyControl is not installed in a bathroom, kitchen directly above a hob, or other high-humidity area. Relocate if necessary.
- 2. Gentle cleaning: Remove the EasyControl from the wall plate (power off) and gently blow away dust from vents using dry compressed air. Do not use liquids.
- 3. Firmware update: Update the EasyControl firmware via the app to ensure correct sensor handling.
Professional help: Persistent C18 indicates a failed internal sensor; the EasyControl unit may need replacement.
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Repair Difficulty
Easy
2/5
Required Part
Bosch EasyControl internal humidity sensor
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