E15 displayed and thermostat overheats or becomes very warm to the touch, then shuts down

Warning: Overheating can damage the thermostat and wiring. Turn off power at the breaker before removing the unit.

• Step 1 – Check installation location:
  • Ensure the thermostat is not installed above radiators, heat registers, or in direct sunlight.
  • Relocate the thermostat if necessary.
• Step 2 – Inspect ventilation:
  • Make sure side and rear ventilation slots are not blocked by paint, wallpaper, or mounting boxes.
  • Do not seal the thermostat to the wall with caulk.
• Step 3 – Remove from wall and inspect:
  • With power off, remove the thermostat from the wall plate.
  • Check for signs of burning, discoloration, or melted plastic on the main PCB.
• Step 4 – Replace thermostat if internal damage is found:
  • If any components appear burnt or the unit still overheats after relocation and cleaning, the internal regulator or another component is failing.
  • Replace the thermostat immediately.