S.31 — Central heating thermostat off or no eBUS heat demand

What does S.31 mean?

The central heating thermostat knob on the boiler is turned off, or the eBUS control unit is not sending a demand for heat. This prevents the boiler from starting the heating cycle.

• Central heating thermostat knob is off.
• eBUS control unit is not calling for heat.
• eBUS communication issue.

Click steps to track your progress.

1. 1

   Ensure the central heating thermostat knob on your boiler is turned to an active heating position, not off.

2. 2

   Check your eBUS control unit (if fitted) to ensure it is programmed to call for heat.

3. 3

   If the issue persists, reset the boiler by pressing the reset button (if available) or cycling power.