S.31 — Summer mode active or no heat requirement

What does S.31 mean?

The boiler is either in summer mode, which typically disables heating, or there is no active demand for heat from your eBUS controller.

• Boiler is currently set to summer mode.
• No heat demand registered by the eBUS controller or external thermostat.
• External controller settings are preventing heat requests.

Click steps to track your progress.

1. 1

   Check your boiler's operating mode to ensure it is not set to 'Summer' if you require heating.

2. 2

   Review the settings on your eBUS controller or room thermostat to confirm there is an active heat requirement.

3. 3

   Consult your controller's manual to adjust settings if heating demand is not being sent to the boiler.