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Weird boiler noises

Discussion in 'Plumbing and Central Heating' started by arni, 29 Nov 2005.

  1. arni


    6 Apr 2005
    Thanks Received:
    United Kingdom
    I have a Halstead Hero 75 boiler, installed about a year ago. It has recently developed an annoying problem, it has been recently serviced. When it fires up from cold it runs for quite a time and as the radiators get hot, it cuts out as I presume it is meant to. The problem is that about 4 or 5 minutes before it cuts out, it start to make peculiar noises, sort of banging or creaking inside. The higher I have the boiler thermostat, the louder and worse they get. When the boiler starts up again about three minutes later it works perfectly, no more noises and it continues to work perfectly, cyclying on and off until the roomstat says "I'm there" and then staying off. When the temperature in the room drops and the roomstat tells the boiler to start up again, the whole process starts again, long initial period of heating with the noises returning just before cut out, then period of cycling on and off with no more noises. I don't understand why the noises develop at the end of the initial period of heating or why they then go away, no matter how long the boiler cycles and and off after that. The pump is on high and running silently

    Any help/ideas will be very much appreciated.

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