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when we turn on the ch from cold we get a knocking under the floorboards(every 5 secs for about 5 mins). i am going to take up floorboards and locate trouble area. when i find it would you say it is because clamps too tight or too loose. i am going to put some armaflex tape 3mm x 50mm under the...

last night i noticed the room was cool and went to turn the heating on via the room stat (horstmann) which had the flame symbol to say the stat was telling the boiler to work. the boiler had 1 light on to say all ok in standby mode. i disconnected the room stat from the boiler and refitted the...