L A

Boiler has incurred an overheat situation

If fault has occurred within the last 15 minutes, allow boiler to cool down, then press reset button If boiler lights and continues to run for a period of over 5 min's, boiler ok.

trv

Possible reasons for fault code

Low or no system pressure - refill system

Lots of air in system - Bleed air from radiators

Do all radiators have thermostatic valves (TRV'S)