Low pressure in central heating system

D13exile

Hi. I had a new Veissmann gas boiler installed last September by a company that was less than professional on the job. Anyways the new radiator they installed in the attic was completely full of air so I bled it to let it heat up. This caused the pressure in the system to drop from one bar to 0.3 bar. I tried to refill the system using the valve they installed in the attic (it was in the hot press in my last house ??) but nothing happens. I can’t get the system pressure back up. As the pressure is so low, I’m afraid the boiler might lock out in the current cold spell. Any ideas? I’ve attached a photo of the “filling loop” they installed in my attic. As you can see from the right, it’s one of those valves that can be turned on and off with a screwdriver. The red handle valve controls the water feed to a sink in the attic.

And getting the original plumbers back is not an option as they caused water damage to my house when they spilled the entire contents of the old water tank they were removing and I only found out when I came home from work to find my sitting room ceiling hanging down and the wooden floor ruined. I asked them to get this fixed and they still havent five months on.

Wearb

Have you checked to see if that grey knurled knob is turned on? If its off, then watch the gauge as you turn it on.

Edit: Is that the tank overflow just coming out of the tank and not piped to outside? :eek:

D13exile

Wearb wrote: »

Have you checked to see if that grey knurled knob is turned on? If its off, then watch the gauge as you turn it on.

Edit: Is that the tank overflow just coming out of the tank and not piped to outside? :eek:

I don’t know what they’ve done up there tbh as my last house had a filling loop in the hot press controlled by a valve like the red one in the photo. So I turn that grey knob that says “1.5 bar” on top of it? Clockwise or anti clockwise? Better to ask than end up busting a fitting.

And no, the overflow is in place from the water tank to the outside. That’s an old unused tank that was never removed when the previous owner converted the attic. Many thanks for the advice.

Wearb

D13exile wrote: »

I don’t know what they’ve done up there tbh as my last house had a filling loop in the hot press controlled by a valve like the red one in the photo. So I turn that grey knob that says “1.5 bar” on top of it? Clockwise or anti clockwise? Better to ask than end up busting a fitting.

And no, the overflow is in place from the water tank to the outside. That’s an old unused tank that was never removed when the previous owner converted the attic. Many thanks for the advice.

Anticlockwise, but if you are worried about doing harm, get in a professional. Btw it might be already turned on so if it’s tight, then try turning both ways so that you can establish if it’s on or off already.

D13exile

Wearb wrote: »

Anticlockwise, but if you are worried about doing harm, get in a professional. Btw it might be already turned on so if it’s tight, then try turning both ways so that you can establish if it’s on or off already.

I’m handy enough at diy but I also know when to ask a question if I’m unsure😉. I’ll give it a try myself tonight to see if it works. If not, I’ll call in a Pro, just not the shower I had in last year. Thanks again