Thermostat shows E07 and humidity readings are missing or clearly wrong (0% or 99% constantly).

Safety first: Turn off HVAC power at the breaker before removing the thermostat from the wall plate.

• Step 1 – Verify with external hygrometer: Place a separate humidity meter near the thermostat and compare readings. If the Geo shows 0%, 99%, or does not change, the sensor is likely faulty.
• Step 2 – Inspect vents and sensor: Remove the thermostat and gently blow out dust from the side and bottom vents using canned air. Do not use liquids or cleaners on the sensor.
• Step 3 – Reboot and update firmware: Power‑cycle the thermostat by removing it from the wall plate for 30 seconds. Reattach and check the Geo app for firmware updates; install any available update.
• Step 4 – Check for condensation damage: Look for signs of moisture or corrosion on the PCB, especially around the small humidity sensor chip. If present, the board is compromised.
• Step 5 – Reset to defaults: Perform a factory reset from the settings menu and reconfigure. Recheck humidity readings after 30–60 minutes of operation.
• Step 6 – Replace thermostat: If E07 persists and humidity readings remain invalid, the humidity sensor IC has failed. Replace the thermostat head unit.