This boiler is starting to drive me mad as the pressure keeps building up to 3 bar at which point the relief valve keeps coming into play. So far in my vain attempts over the last few months to fix it I've fitted a new pressure relief vavle, a new 3 port divertor (complete assemby) and new diaphragms on the domestic HW manifold & CH Manifold auto-bypass.
When i fitted the last 3 item (ie not the PRV) the pressure did seem to stabilise for about a week but now its creeping up again from 1.2bar to 3 in less than an hour. I've also tried disconnecting the filling point to rule out any leaks (drips) into the system but its not that either. Also tried at least half adozen times a complete drain of the boiler and refilling it by the book but it still doesn't want to play ball.
Since i fitted the new diaphrams and 3port valve about 2 weeks ago there's been a bit of noise coming from main heat exchanger almost like whats passing through it isnt 100% water (air?) but since Ive drained and refilled the complete CH system it by the book numerous times including last night when I also added some wickes CH cleanser to it just in case that helps.
I suspect that somehow the CH circuit is getting extra water from somewhere but as the filling loop is disconnected and the symantecs of the HW/CH seem to indicate the water from the Cold water inlet cannot interfere with the CH system apart from when the 3 port valve diverts heated water to the DHW Heat Exhanger to heat the DHW and that its possibel that even though the water flowing through the 2 inlet & 2 outlet pipes for the DHW & CH shouldnt have any contact with each other inside the DHW Exchange that maybe the exchanger unit has a performation?
Has anyone come accross this before because its difficult for my to diagnose unless I try remove the unit itself and my searches have come up blank for this happening before?
Any other ideas?
When i fitted the last 3 item (ie not the PRV) the pressure did seem to stabilise for about a week but now its creeping up again from 1.2bar to 3 in less than an hour. I've also tried disconnecting the filling point to rule out any leaks (drips) into the system but its not that either. Also tried at least half adozen times a complete drain of the boiler and refilling it by the book but it still doesn't want to play ball.
Since i fitted the new diaphrams and 3port valve about 2 weeks ago there's been a bit of noise coming from main heat exchanger almost like whats passing through it isnt 100% water (air?) but since Ive drained and refilled the complete CH system it by the book numerous times including last night when I also added some wickes CH cleanser to it just in case that helps.
I suspect that somehow the CH circuit is getting extra water from somewhere but as the filling loop is disconnected and the symantecs of the HW/CH seem to indicate the water from the Cold water inlet cannot interfere with the CH system apart from when the 3 port valve diverts heated water to the DHW Heat Exhanger to heat the DHW and that its possibel that even though the water flowing through the 2 inlet & 2 outlet pipes for the DHW & CH shouldnt have any contact with each other inside the DHW Exchange that maybe the exchanger unit has a performation?
Has anyone come accross this before because its difficult for my to diagnose unless I try remove the unit itself and my searches have come up blank for this happening before?
Any other ideas?
