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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...