Hello,
Got a open vented Y plan system with a Suprima 30 non condensing boiler (10mm microbore CH). & small rads in a 3 bed house. The feed vent are combined with an air separator. Came back from holiday (boiler off for a week) and noticed the above noises when the HW was turned on. Noises are loudest by the boiler flow and return pipes and in the cylinder cupboard where the valve, pump and air separator are. Noticed the FE tank is quite dirty which thought strange as system was cleaned a year ago. HW and CH are working fine and heating up in normal time - just a bit alarmed by the noise as was not there before we went away. Not had any work done on the system so cannot explain this - dunno what to do. Was thinking drain, refill, x400 but its a bit hot to have system on full for a day or so!
Got a open vented Y plan system with a Suprima 30 non condensing boiler (10mm microbore CH). & small rads in a 3 bed house. The feed vent are combined with an air separator. Came back from holiday (boiler off for a week) and noticed the above noises when the HW was turned on. Noises are loudest by the boiler flow and return pipes and in the cylinder cupboard where the valve, pump and air separator are. Noticed the FE tank is quite dirty which thought strange as system was cleaned a year ago. HW and CH are working fine and heating up in normal time - just a bit alarmed by the noise as was not there before we went away. Not had any work done on the system so cannot explain this - dunno what to do. Was thinking drain, refill, x400 but its a bit hot to have system on full for a day or so!