The thermostat displays a humidity level that is clearly incorrect (e.g., stuck at 10% or 90%) compared to other hygrometers.

Safety: No high-voltage work is required.

• Step 1 – Compare with reference: Use a known-good hygrometer near the GLAS to verify the discrepancy.
• Step 2 – Dry out environment: If condensation is present on or near the thermostat, allow it to dry completely and improve ventilation.
• Step 3 – Reboot and update: Power cycle the GLAS and install any available firmware updates.
• Step 4 – Relocate if necessary: Avoid installing the GLAS in bathrooms, over humidifiers, or in kitchens where steam is common.
• Step 5 – Replace thermostat: Persistent large errors indicate a faulty humidity sensor. Replace the GLAS thermostat.