My CH and hot water are out of action because of a leak from the block valve next to the tundish in the picture - pressure on the gauge on the boiler had dropped to zero and when I tried to refill it it just sprays out from the stem of this valve. You can see rust marks suggesting to me that the valve has corroded - if it's original to the system it's about twelve years old.
It's a Vaillant system boiler and pressurised cylinder and the valve is on a tee off the feed from boiler to cylinder coil.
Replacing this valve looks straightforward, but two questions:
- am I allowed to touch this, given it's a pressurised system? Does it make a difference that it's on the boiler circuit not the cylinder itself?
- if so, is there anything I need to know about re-pressurising the system afterwards?
Thanks for any advice!
It's a Vaillant system boiler and pressurised cylinder and the valve is on a tee off the feed from boiler to cylinder coil.
Replacing this valve looks straightforward, but two questions:
- am I allowed to touch this, given it's a pressurised system? Does it make a difference that it's on the boiler circuit not the cylinder itself?
- if so, is there anything I need to know about re-pressurising the system afterwards?
Thanks for any advice!