FAULT CODES 2

None

Fault code	Cause	Action (click on appropriate action)
F0	Internal fault	Control unit
F1	Max. flue gas temperature exceeded	Check heating system fill level, circulation pump & system
F2	Temperature limiter has responded	Check heating system fill level, circulation pump & system. Check the temperature limiter and connecting cables
F3	Flame signal is already present at burner start	Check ionisation electrode and connecting cable
F4	No flame signal detected	Check ignition operation
F8	Fuel valve closes too late	Check gas train, check both control paths
F9	Fan speed too low during burner start	Check fan, fan connecting cables and power supply to fan; check fan control.
FA	Fan idle state not reached	Check fan, fan connecting cables and power supply to fan; check fan control.
FC	Electrical fan control (control unit) faulty	Check fan connecting cable; replace if required, or replace control unit
FD	Fault, burner control unit	Check ignition electrodes and connecting cables. Check whether a strong interference (EMC) field exists near the appliance.
FF	Fault, burner control unit	Check ignition electrodes and connecting cables. Check whether a strong interference (EMC) field exists near the appliance.
---- ⧌	Comms error control and programming unit	Not applicable for this boiler.