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A friend of mine called out an engineer to deal with a problem Glow-Worm combi that was providing neither HW or CH. The guy removed the heat exchanger and gave it a descale, replaced it and the boiler worked fine for a couple of days and then failed again. The same chap returned saying the gas valve had packed up and would require replacement so a new gv was installed. The boiler is now operating correctly but there is an occasional dripping from the outside overflow.
What is the likely cause, here? Any advice much appreciated.
What is the likely cause, here? Any advice much appreciated.