Thermostat displays E230 indicating humidity sensor fault; indoor humidity reading is unavailable or clearly wrong.

Safety warning: Turn off power to the thermostat before removing it from the wall.

• 1. Reboot and update:
  • Power cycle the HVAC system and thermostat.
  • If the thermostat supports firmware updates, check for and apply any available updates.
• 2. Inspect environment:
  • Ensure the thermostat is not installed in a bathroom, kitchen, or other high-moisture area.
  • Check for visible condensation or contamination on the thermostat face.
• 3. Remove and reseat thermostat:
  • Pull the thermostat off the base and inspect for corrosion or damage.
  • Reinstall firmly and retest.
• 4. If E230 persists:
  • The internal humidity sensor is not serviceable.
  • Replace the thermostat with a new Lennox smart thermostat if humidity control is required.