Set Appliance State:

Mains Power Off

Observation:

Check system pressure is approximately 1 - 1.5 bar (when system is cold).
Allow a small amount of water into the system via the filling loop.
Does the gauge respond to the increase in pressure?
(This is to check the pressure gauge is not blocked).
If the appliance has the intelligent filling loop fitted then it is possible to add pressure by turning the screw just below the solenoid. (screw slot vertical is closed, horizontal is open)
CLICK HERE for information of the intelligent filling loop.