Remedy
Compare to internal pressure dial maximum 0.7 bar pressure differential between them.
Top up water until the pre-set pressure reached.
Intelligent filling loop
▶ Switch off the intelligent fill in the system menu, re-pressurise manually and vent the system.
▶ Ensure the correct pressure then factory rest appliance. If cause code does not clear power off appliance.
Other filling loop
▶ Vent the heating system and top up water until the pre-set pressure reached.
Pressure sensor
▶ Check the continuity down harness for the pressure sensor and replace if required.
▶ Check the voltage at the pressure sensor and replace if required.