I bled a rad that was cold at the top, and not much water escaped. This fixed the rad, but the pressure in the boiler dropped to just below 0.3(It may have been low to begin with, since I hadn't checked this in a good while). I checked with the manual, and a couple of youtube videos of similar boilers, and then happy that I knew exactly what to do, I opened two valves on the filling loop(which was already attached by whoever installed it), expecting the boiler to re-pressurise... but literally nothing happens. I was wondering if anyone might know of a reason for this? I am quite sure all valves that should be opened, are. I haven't had any problems with the boiler before this.

Below are the instructions from the user manual.. my filling loop is basically in the state you see in the last picture(set up). Turning the valves as instructed does nothing.. Any help is much appreciated.

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  • 1-2 bar is approximately 15-30 psi with all the air out and pressure from a house faucet you should have more than enough water pressure. After the system runs the system may need additional air bled off. Large boilers have DA tanks (de-air) to remove the air from the system. I don't work on small systems but it sounds like you are doing it correctly. Is your pressure gauge good?
    – Ed Beal
    Dec 21, 2016 at 0:23
  • @EdBeal I assume it is. In every youtube video I've watched of people doing this, there is a rushing sound of water when they open the valves.. I hear nothing at all... it seems to me like there is no supply of (mains) water to the refill loop... any idea why that might be? (I've opened and closed all 4 valves connected to the loop in all the orders I can think of..)
    – Totem
    Dec 21, 2016 at 4:25
  • 1
    I am sure you thought of this but could there be another shutoff for the main water supply?. When you turn the valves watch the screw in the center of the valve if it doesn't turn the ball valve may be stuck in the closed position and the handle cracked / broken I have seen that in the past.
    – Ed Beal
    Dec 21, 2016 at 13:51
  • @EdBeal Thanks for your replies. I have posted a picture of the valves above. The problem valve, I believe is the blue one on the front left. I think you were right about the screw not moving, but as you can see, it's hard to get to(there's about an inch between the valve and bottom of the boiler). Any ideas what I could do about this? I can't get to it with a screwdriver. I'm not sure how I might turn the pipe around for better access or if I even should try this (I'm guessing I shouldn't)..
    – Totem
    Dec 21, 2016 at 15:19
  • Seems like if the plastic handle was gone I could maybe turn it manually?
    – Totem
    Dec 21, 2016 at 15:35

1 Answer 1


So I got a guy out to fix it. This was months ago at this point. However, he discovered that the fill loop had been put on "the wrong way around". I'm not a plumber, or person who knows about pipes, but I am assuming from his explanation that water simply couldn't flow either way through this small section of pipe... regardless, he said he put it on the right way around, and indeed I can now repressurise the system. I have no idea why the guy before this put the pipe on backwards..

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