Fault description
Cause
Solution
Air in the system
Vent the system
Radiator supply
Zone valve flow too low / too high
Check the Kv value on the zone valve
Setting for room temperature
controller is not correct
Check the setting for the room temperature controller
Strainer is dirty
Clean the strainer
Room temperature controller wiring
is not correct
Check the wiring for the room temperature controller
Actuator not connected to the zone
valve
Actuator closed without current on the zone valve connect this electrically
Radiator thermostatic valves or
return screw connections closed
Check the thermostatic valves and return screw connections
No hot water and no heating
No heating/no hot water
Ball valves/locking devices closed
Open locking devices
Central heating circuit pump not
working
Check that the central heating circuit pump is working and correctly set
Central strainer is dirty
Clean the central strainer
Heating system is not working
correctly
Check the heating system
Buffer storage tank is not filled
Check the buffer storage tank filling
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Combi Port Base
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Installation and operation manual
