No Hot Water or Central Heating demand — Boiler not receiving call for heat

What does No HW or CH demand mean?

Neither hot water nor central heating is being produced, and the boiler is not responding to any calls for heat. This indicates the boiler isn't receiving a signal to operate.

• External controls like the programmer or room thermostat are not requesting heat
• Wiring issue preventing the demand signal from reaching the boiler

Click steps to track your progress.

1. 1

   Ensure your central heating and hot water programmers are correctly set to 'on' or 'auto' for desired heating and hot water periods.

2. 2

   Check your room thermostat to ensure it is calling for heat (set it higher than the current room temperature).

3. 3

   Try boosting the central heating or hot water manually on your programmer.

4. 4

   If the boiler still doesn't respond, contact a qualified electrician or heating engineer to check the wiring and external controls.