Boiler does not respond to room thermostat; heating stays off even though hot water works

Safety first: Isolate power before accessing thermostat wiring or junction boxes.

User checks:

• Thermostat settings: Ensure the Dimplex thermostat is set above room temperature and not in frost or off mode.
• Programmer: Confirm heating channel is set to ON or timed appropriately.
• Battery replacement: If the thermostat is battery-powered, replace batteries and retest.

Professional actions:

• Test continuity of thermostat wiring and replace the Dimplex room thermostat if faulty.
• Check motorised valve operation and end switch output to the boiler.