how can i fix my britony 80/100 combi?
my central heating is fine. the hot water fluxuates between hot and cool. there is also a loud groaning noice from the boiler. the diverter valve, HW thermostat, flow switch have been changed. i was thinking it might be the secondary heat exchanger is blocked. what solution can i use to clean it out?? thanks
declan
March 2011
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