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- 26 Dec 2009
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Hello,
I've what I imagine is a standard open-vented central heating system with an indirectly heated hot water cylinder. The boiler is fairly old but apparently is well made (Ideal classic).
I've recently had three new radiators fitted as well as a new 3 speed Grundfos pump (pump was fitted a few weeks before radiators). The system was also treated to a chemical flush for one week (which is how long the new radiators have been fitted).
I was up in the loft earlier and I happened to be up there when the pump shut off and I noticed that water came out of the vent pipe (not forcefully, but the trickle lasted for about 1 minute) into the F&E tank. I've reduced my pump speed to 1 and that seems to have reduced the amount of water coming up the vent pipe to a small 5 second trickle, but it still happens without fail everytime the pump stops (you can feel the hot water travel up the pipe when it stops and then it gets cold again when the pump restarts.
I'm now at a loss as to how to fix this and I'm probably going to be stuck getting anyone out soon at this time of year so I'd appreciate any ideas. Apologies for the lengthy post, I'm trying to give as full a picture as possible.
Thanks.
I've what I imagine is a standard open-vented central heating system with an indirectly heated hot water cylinder. The boiler is fairly old but apparently is well made (Ideal classic).
I've recently had three new radiators fitted as well as a new 3 speed Grundfos pump (pump was fitted a few weeks before radiators). The system was also treated to a chemical flush for one week (which is how long the new radiators have been fitted).
I was up in the loft earlier and I happened to be up there when the pump shut off and I noticed that water came out of the vent pipe (not forcefully, but the trickle lasted for about 1 minute) into the F&E tank. I've reduced my pump speed to 1 and that seems to have reduced the amount of water coming up the vent pipe to a small 5 second trickle, but it still happens without fail everytime the pump stops (you can feel the hot water travel up the pipe when it stops and then it gets cold again when the pump restarts.
I'm now at a loss as to how to fix this and I'm probably going to be stuck getting anyone out soon at this time of year so I'd appreciate any ideas. Apologies for the lengthy post, I'm trying to give as full a picture as possible.
Thanks.