Hi. I have a similar problem on this boiler with green light flashing and boiler running constantly. Tried reset but made no difference. Switched off boiler a few minutes and reset again, no go. Tried switching off thermostat, as well as setting heating on Hive control to manual, but boiler still constantly humming. Pump kicking as usual when hot water tap on but takes 60 to 80 seconds for hot water to come through. Before the service last month, hot water came through within 20 seconds. However, now switched off at wall because the cost of boiler constant running is worrying me. Heating set to 18.8 and room temperature is currently 21 so no reason why boiler should he running. Can anyone advise me please?