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Thanks for all the info. Boiler is in a compartment with faned flu running up through chimley. There is also a vent in the kitchen/conservatory wall which had a unsuitable grill on it - fine mesh fly screen built into it, but changed that to a wicks 'gas' cover allowing 143cm2. He said...

Have a Potterton Kingfisher MFL 60 which was installed feb 05. Gravity CH system with potterton 2000 timer/control. Been fine till 2 weeks ago when red lock out light comes on few times a day. Some times will run for 2-3 days and other days will cut out 5-6 times. Water very hot in tap and...