hi guys got a problem with a back boiler,dont know which model but is mated to a robinson willey fire,back boiler is controlled by a randall hot water only or heating and hot water timer,in hot water only mode the hot water flows and returns through the hot water cylinder circs just fine,in heating and hot water mode the radiators get very hot ,but the flow circ to the hot water cylinder gets boiling hot and the return is lukewarm,the heat is so hot through the flow to the hot water cylinder it is going all the way back up to the header tank and filling it up via the 15mm heating system filling pipe,whats the most likely problem,thanks and kind regards,rob gas safe gas engineer
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