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1 drained system over weekend flushed with mains water several time. 2 vented all rads pump. 3 added white powder ( after acid cleaner been in 4 days .) 4 water can be heard gushing around system seems to have good flow if not better than ever. 5 flow and return pipes only warm so are rads...

up date on boiler plumber advised descaler to be added to water after draining says possible blockage ie heat cannot get out of heat ex hence boiler cuts out or faulty overheat stat . fault boiler lights heats up rads warm cuts out but trying to relight. any ideas or input would be greatfull.

back again some of you my have read last problem with pump (ch at wits end)replaced pump (new) had another bash today vented drained system seemed ok boiler starts now have warm not hot rads up and down(suspected air lock)but for some reason boiler cutting out just after it lights trying to...

myson appollo fan fair boiler drained system inspected pump seems ok,pump on return flow flow pipe hot mad hot return pipe cold could heat exchanger be blocked at wits end please help