Topping up a sealed system, novice.

Toyotafanboi

Made a novice error I think lads.

The last while, a few of our rads weren't getting hot at the top and the system was gurgling a lot when we turned the heating on.

Last night I bled the rads, lovely job, all the rads were roasting for the rest of the evening. Didn't really lose much water from the system, maybe 100ml max.

Anyway, today, went to turn the heating on and nothing, not a sausage, all rads stone cold. We have plenty of heating oil and the hot water cylinder which is heated from the central heating oil too is roasting.

At present we have 5 rads downstairs, all of which if I open the bleed valves now have water coming out, but if I open the bleed valve on the single rad we have have upstairs, there is no water coming out, nor is there the sound of air hissing out from it.

Bit stumped, would love a bit of advice lots of knobs and valves in the hot press upstairs but I'm sceptical to touch a thing now.

Wearb

Find the pressure gauge and take a pic of that area and we can then advise. It will be a gauge if about 50mm diameter.

Toyotafanboi

This is the hot press, there is a gauge on the left of the photo...



Can't get a good photo of the gauge but it's reading a little over 9.0 bar.



Thanks!

Toyotafanboi

Not very sceintific but if I turn the small blue return sprung valve on the left of the first photo I can hear water running and the red screw valve in the middle of the first photo was turned off (I think) when I got to it, but turning it fully the other way seems to make no difference, so I just put it back the way it was before I got there.

K.Flyer

Close the red lever valve (EXCEL) to the shut position. Run your hot and cold tap for a few minutes and watch to see if the pressure on the drops down. If it does drop down then the valves (The lower one is a pressure reducing valve and the other is a pressure relief valve) are to do with your hot and cold water and not your central heating. Either way 9 bar is way too high and needs to be checked.
Can you show more of the hot press, filling valve may be elsewhere.

Toyotafanboi

Done what you said, closed the valve marked "excel", ran the taps for a bit but there was no change. 9 bar does strike me as a lot too though for something I am sleeping a few feet away from to be holding 100+ psi.

That's essentially all the visible pipework in the hot press, the other side is just the cylinder itself.

If you look to the cylinder on the far right of photo one, where the two pieces of pipework are leaving the hot water cylinder there are two blue stickers, the top one is synbolising "rads, cold water" and the one below that is symbolising "shower, cold water"... out of shot above those is "rads, hot water" and "shower, hot water"...

I will try for a better photo there of what I already have.

Toyotafanboi

Not very conclusive, but;

I got up this morning and switched the heating on, checked the rads after breakfast, still stone cold.

Had a shower and went to work and forgot I left the heating switched to constant on...

Came home this evening and all rads are piping hot, seems to be working fine. Odd. I have a feeling that won't be the last of it. May just call a plumber if it happens again.

Wearb

If I were you I'd get a plumber out either way, to check why pressure is so high.