Humidity Err
Worcester Bosch
Relative humidity sensor failure
Smart thermostat with humidity feature shows 'Humidity Err' or no humidity reading.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed onboard humidity sensor, Condensation damage, Firmware misreading sensor, Contamination on sensor element
How to Fix / Troubleshooting
Safety first: Work only on the thermostat; no mains exposure.
- Dry environment: If the thermostat is in a very humid area (bathroom, kitchen), move it to a drier location if possible.
- Power cycle: Remove power/batteries for 1–2 minutes and restore to reset sensor readings.
- Do not clean sensor directly: Avoid touching or cleaning the small humidity sensor opening; this can cause permanent damage.
- If error persists: The humidity sensor is usually integrated on the PCB and not user‑replaceable. The thermostat may need replacement if humidity readings are important to your system.
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Repair Difficulty
Medium
3/5
Required Part
Smart Thermostat Main PCB (with Integrated Humidity Sensor)
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