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Hi everyone, I hope someone can shine some light on my problem, I've pulled most of my hair out so far..! I moved recently and inherited a Greenstar Heatslave II External boiler which in turn is controlled by an old Build Centre 7 day timer and a Honeywell BDR91 Relay Box wired into CH circuit...

Hi We have a Halstead Finest Platinum, its 6 years old. The problem is with the domestic hot water, for instance when running a shower the boiler will stop heating the water for 10 seconds or so then restart, there are no lock out lights or led codes, absolutely nothing. It just stops heating...