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From the various replies I have obtained - as a complete lay person - from asking a simple question - how can air get into my CH system - I seem to be getting drawn into irrelevant debates of a technical nature including the definition of a microbore system. Perhaps Agile should inform Trading...

Thanks twgas. Bungalow, conventional straight layout. Boiler on kitchen wall at front end of house, piped into loft with straight runs 8 metres to opposite end with F&E tank. Pump in airing/HW cylinder cupboard teed down some 2 metres along from F&E tank. Microbores to 6 rads teed off at...

Thanks Tibbot Air was indeed in system - by connecting mains supply to return pipe a short burst sent a fair amount of air into header tank. Took another burst to make a real difference, but as boiler still cuts out before room temperature met (as it used to), seems as though there could yet...

Hi. My bungalow has an oil-fired Wallstar open vented CH system with 6 rads. Since new 2000 (bungalow & CH) it has been plagued with CH problems. The most repetitive is boiler cutting out after 2 minutes, off for 10 mins + then on for 2 mins. Etc. Naturally rads just about warm, or one rad hot...