Thermostat displays E7 and may shut down or refuse to operate; often associated with high ambient temperature or poor ventilation.

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

Steps to check:

• Check mounting location: Ensure the Salus thermostat is not mounted directly above a radiator, on a chimney breast, or in a cupboard with a boiler. Relocate to an internal wall about 1.5m above floor level, away from direct heat sources.
• Inspect ventilation: Make sure the air vents on the thermostat housing are not blocked by paint, wallpaper, or furniture. Clean dust from vents with a soft brush.
• Check for direct sunlight: If the thermostat is in a south-facing position, consider fitting a small shade or relocating it to avoid solar gain.
• Allow cooling: Power off the unit and allow it to cool for 30–60 minutes. Restore power and observe if E7 returns under normal room conditions.

Resolution: If E7 recurs in a suitable location with good ventilation, the internal temperature sensing or power components may be faulty. Replace the thermostat head.