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also given that this valve won't budge, i feel it could well be stuck..If you look at the picture, you will see it hasnt been touched in ages and has this greenish-white tinge to it

@terryplumb - the boiler has a pressure gauge, i am including a picture. The boiler is a vaillant one I tried to figure today how to turn towel rails off. there isnt a TRV on the rails. On either side of the towel rail there are two white caps which I can move clockwise and anticlockwise. are...

used the trvs on all rads to turn them off..

yes they worked last year.

I think its my lack of attention to detail! I will do this test tomorrow : turn off hot water on programmer, ensure heating is on, turn off 3 good radiators and leave 2 faulty on and see if boiler is firing up in the 10 minute period and flame sign is on the panel. About the TRV : yes i did...

right so did that. pipes running to the 2 faulty rads turned hot but rads remained cold. As i mentioned earlier, not ice cold slab of metal though. I didnt observe the boiler's control panel explicitly. will re-do this tomorrow morning and report here. out of interest if the boiler is burning...

I thought living room rads were to be left on. I did that. observation to report is that pipes to the TRV went hot again but rads still cold. other observation is that rads arent ice cold. it's 3 degrees today, rads are cold but they arent like a cold slab of iron that i would expect on a day a...

@Harry Bloomfield : Thanks for the post. I tried with one of the rads lockshield. When i removed the white plastic cap, I saw a valve with a screw head which was rather different from all youtube videos. On videos i saw an 'alens key' like head. I took a scredriver and tried to move...

@sxturbo - that Y plan is a bit too technical for me. I have never done balancing of radiators. I saw the phrase this evening when I was going through some forums. Should i have done so?

Thanks @terryplumb . its a 20 year old property, Boiler was replaced in 2015. the installer didnt mention a word about heating zones. so i am likely to assume lets not go there. I will give this a go NOW.

Yes , radiators were bled today. I switched off the boiler and then when switched on, i can confirm that pipes running up to those 2 rads were rather warm. now - about 30 minutes later, the pipes are cold again. @sxturbo - how do i confirm if i have a Y plan heating system? I am not sure i...

Hi I believe our heating programmer might be broken but not sure. Property : 2 bedroom, 2 bath flat on 6th floor of purpose built development, 5 radiators, 2 towel rails Background : turning heating button off on "controller" (rather old Danfoss randall, picture attached ) in summers didnt...

Thanks a lot James. Out of interest, do you want to quanify "few bobs" - how much is the damage going to be roughly?

Yes it's granite.

our kitchen work top is L shaped. at the 'L' there was a joint which became lose or broke. the picture shows the state of the joint. The worktop doesnt move or isnt remotely wobbly. But its just moved that much more from its original position. The worktop used to be snugly joint to tilework &...

All right, will do. Till then should I let boiler run or power it off.

Not sure I understand that. Is it something I can do or I call in an engineer? Also if I am calling someone in, till then should the boiler be in use?

The pressure bar was being read from the display. On double clicking one of the buttons , flow temperature and pressure bars are displyed. When I let the water out, I monitored that and the inverted triangle bar on the right

Dilalio Is there any reason for boiler to become noisier after doing this? There is a whirring sound from what was a very silent boiler The pressure is within limits and hot water is flowing ok, no alerts or fault codes are seen. I'm worried I've messed something up now

Ok, got the cold pressure down to 1.1 Fired up heating with target flow temp of 65. Heating nicely with pressure at 1.7b. I will wait a little and then fire heating up as well and see if pressure fluctuates then. thanks for the help dilalio.