When a domestic hot water (DHW) tap is turned on, the boiler does not start. What should I do?

If the boiler does not start when you turn on a hot water tap, make sure the flow rate at the water drawing point is sufficient. If the flow rate is sufficient, then check that the pressure on the boiler pressure gauge is at least 1 bar.

Should these two precautions not be enough for the boiler to start, then we recommend you contact the Unical Service Centre dedicated to heating systems.