Biasi Prisma no dhw

19 Jan 2010
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United Kingdom
last night my boiler stopped heating the dhw, luke warm for a minute then nothing, i turned the boiler control to the summer setting, openrd up the hot water taps nothing boiler did not fire--turned switch back to winter (snow flake) ch ran as normal heating the hot water for a short interval(40 seconds)
any suggestions welcome
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