Thermostat shows E8 and backlight may dim; device feels unusually warm to the touch.

Safety first: Turn off power before relocating or removing the thermostat.

• Check mounting position: Ensure the Drayton thermostat is not mounted directly above a radiator, towel rail, or other heat source, and not in direct sunlight.
• Improve ventilation: Make sure ventilation slots are not blocked by paint, wallpaper, or furniture. Clean dust from vents with a soft brush.
• Verify supply voltage: Confirm that the thermostat is connected to the correct supply type (mains vs. low voltage) as per Drayton’s installation instructions. Incorrect wiring can cause overheating.
• Relocate if necessary: If the location is unsuitable, move the thermostat to an internal wall away from heat sources, following Drayton’s siting guidelines. Rewire and test. If E8 persists in a good location, replace the thermostat.