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Mick, Thanks very much for your reply. I should have mentioned that the heating system has two modes of operation, namely; 1.Heating the water in the domestic hot water storage tank only 2.Heating the domestic hot water tank and also the wall mounted radiators (6 in total). It is...

Thorn Apolo Boiler - System Problem On low stat setting everything is working fine, pump running & radiators heating satisfactorily. On high stat setting the burner ignites normally and the full flame comes up, the pump appears to be running satisfactorily but radiators are not heating up...

Thorn Apolo Boiler - System Problem On low stat setting everything working fine, pump running & radiators heating satisfactorily. On high setting everything flame comes up, pump appears to be running satisfactorily but radiators are not heating up. I would welcome any thoughts as to...