Central Heating - Pressure Rising

[somnerd13]

Last night before going to bed I could hear a tapping sound coming from somewhere near the boiler, couldn't find anything though so I just put it down to the noise that the flue sometimes makes after having the heating on.

Went down this morning to check again and a pipe with a pressure gauge (http://www.dannysomner.pwp.blueyonder.co.uk/heating/100_0232.jpg), above the boiler had been dripping and water had dripped on the top of the boiler, down the side and down the front!

I thought that maybe the mains water tap (http://www.dannysomner.pwp.blueyonder.co.uk/heating/100_0233.jpg), was letting water in and causing the pressure to go sky high thus making the water leak (pressure was 1.2 by this point - what it should be at cold). Whilst that tap does look slightly open, it is closed, if I turn it anymore you can hear water begin to flow - also the secondary tap is closed.

Since this morning (10am) the pressure rose up to 3.2 (warm water) (4:30pm). The tap was dripping again and this time I turned the red knob on the tap and let enough water out until the pressure went down to 2 (as it should be at warm). It's still rising and I have no idea what the problem is!

Here is an overall photo of the boiler (http://www.dannysomner.pwp.blueyonder.co.uk/heating/100_0234.jpg)

I can take a photo of the insides of the boiler if anybody needs to see it.

 

[gavinda]

thats youre safety valve..it can let out very hot water when the system overheats/overpressuises...thats why they should terminate ouytside. you need someone sharish to come and sort that for you.

its probly just the expansion vessel but water and electrics really dont mix.. best of luck

 

[somnerd13]

Could this be water from the hot water supply piping (as in the piping that supplies water to the boiler for hot water purposes - as is seperate from that for central heating) getting into the central heating piping some how?

 

[gavinda]

could be the calorifier is split inside but id go for basics first... but you really need that safety pipe put in properly. if thats not right you dont know what else is wrong with your system