S.109 - Product's standby mode activated

What does S.109 mean?

The boiler is in standby mode. This means it is powered on but not actively heating or providing hot water, waiting for a demand.

• No current demand for heating or hot water.
• Boiler is waiting for a thermostat signal.
• Normal idle state.

Click steps to track your progress.

1. 1

   Check your thermostat or hot water controls to ensure there is a demand for heating or hot water.

2. 2

   If you expect the boiler to be active, verify the set temperatures on your controls.

3. 3

   If the boiler remains in standby despite a clear demand, try pressing and holding the reset button for more than three seconds.