Error 116; the thermostat reports internal overtemperature and shuts down its outputs.

Safety: Turn off power before relocating the thermostat.

• Check mounting location: If the thermostat is above a radiator, near a fireplace, or in direct sun, relocate it to a cooler interior wall.
• Improve ventilation: Ensure the thermostat is not covered by curtains, furniture, or decorative covers that trap heat.
• Allow cooling: Leave the thermostat powered off for 30 minutes, then power back on and monitor.
• Persistent error: If error 116 appears even in a cool, well-ventilated location, the internal sensor or PCB is likely faulty, and the unit should be replaced.