N
namsag
Wonder if you guys have come across 80/105e`s (not instants) making a droning noise on initial start up from cold lasts about 5 to 10 mins then goes and sounds as quite as a mouse .Only does it on heating no noise at all on HW, pressures are all as they should be and system is perfectly clean with inhibitor added. Did attach this to another thread the other week but forgot which one so if you have already answered soz for being a pain if you are having to answer again . cheers