Just had alterations done to radiators and pipework - pressure went down on our vaillant boiler to 0 within an hour or so of plumbers leaving. Checked for leaks (can't find any) rang plumber who told us to turn blow off valve until it clicked. Did that and boosted pressure up to 1.4 - Pressure still dropping and slow drip coming from outlet pipe from blow off valve. Any ideas ?(we inherited the boiler on moving in here and have been told its a really good one and pretty new).
Vaillant combi
- Thread starter katherine45
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Touching the blow-off valve is a bad idea, just because they can keep dripping.
They presumably had already done so before you arrived, and are getting to you to "make it click" to get it to re-seat and stop dripping. Sometimes that WILL work. Keep trying until you get it to a slowish drip - you're trying to get the muck that's stuck onthe "seat" of the valve in the thing to wash away. The valve is closed by the spring, you can't tighten it yourself.
If you can get it to a slow drip, keep topping the pressure up, say between 1.5 and 2 bar, and with a bit of luck it'll then slow down and stop by itself, they often do, over a couple of days.
SLow drip = less than one drip in about 5 seconds.
Vaillants are OK boilers!
They presumably had already done so before you arrived, and are getting to you to "make it click" to get it to re-seat and stop dripping. Sometimes that WILL work. Keep trying until you get it to a slowish drip - you're trying to get the muck that's stuck onthe "seat" of the valve in the thing to wash away. The valve is closed by the spring, you can't tighten it yourself.
If you can get it to a slow drip, keep topping the pressure up, say between 1.5 and 2 bar, and with a bit of luck it'll then slow down and stop by itself, they often do, over a couple of days.
SLow drip = less than one drip in about 5 seconds.
Vaillants are OK boilers!
Thanks so much to agile and chris for a very prompt reply. Have been on a very steep learning curve with plumbing since moving up here and it's really nice to know there's good advice out there!
Just checked outlet pipe and drips are at a rate of about 1 per second, some a bit faster.
Just checked outlet pipe and drips are at a rate of about 1 per second, some a bit faster.
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I'm guessing the people used your pressure relief valve (blow-off valve) to drain down your system. (rather than attaching a hose to a drain-off on a radiator)
This is never a wise idea as grit often gets into it and therefore doesn't create a seal when closed back off.
Sometimes you can tamper/turn with the head of the valve a little to stop the dripping coming from the blow-off pipe or even manage to slow it down but the chances are that you are going to need your pressure relief valve replaced.
This is never a wise idea as grit often gets into it and therefore doesn't create a seal when closed back off.
Sometimes you can tamper/turn with the head of the valve a little to stop the dripping coming from the blow-off pipe or even manage to slow it down but the chances are that you are going to need your pressure relief valve replaced.
best bet is to get someone to replace the prv cos if you keep pressurizing the boiler with fresh water it's not going to take long before your system starts reacting and producing slugde(magnetite), then your problems will start.
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