Thermostat humidity reading is clearly wrong or stuck at 0%/100%

Safety: No high-voltage work is required.

• Verify with hygrometer: Use a separate hygrometer to compare humidity readings near the thermostat.
• Allow drying time: After painting, cleaning, or high humidity events, allow 24 hours for the sensor to stabilize.
• Clean vents: Gently blow dust out of the thermostat vents with dry compressed air.
• Disable humidity control: If readings are unreliable, temporarily disable humidity-based control features to prevent improper operation until the thermostat can be replaced.