Boiler was in Winermere Avenue , Kenton, Middlesex. The boiler was not working in heating or hotwater mode. When the hot water tap is open , it sounds like the boiler pump and fan is running. But there was no ignition and the Domestic Hotwater light start flashing fast. According to the boiler manufacture, it can be faulty cables, blocked flue, faulty PCB, fan, air pressure switch or blocked tubes. The customer was having a party the next day, and was desperate to get the boiler fixed. The fault was identified and the boiler was repaired the same day. Well another happy customer!