Thermostat or surrounding wall feels unusually warm to the touch during normal operation.

Safety: If the thermostat is hot enough to cause discomfort, turn off power immediately.

• Step 1 – Reduce display brightness and backlight time:
  • In settings, lower brightness and shorten backlight timeout.
• Step 2 – Improve ventilation:
  • Ensure the back box is not filled with insulation.
  • Provide small ventilation gaps if safe and permitted.
• Step 3 – Check ambient conditions:
  • Ensure room temperature is within the thermostat’s specified operating range.
• Step 4 – Relocate thermostat if necessary:
  • Move to a cooler, well-ventilated interior wall.
• Step 5 – Replace unit if overheating persists:
  • Persistent overheating may indicate internal regulator failure.
  • Replace the Protherm smart thermostat.