Central Heating pressure

Kashkai

I had a thread a couple of months back about a suspected water leak under the concrete floor of my hallway. To recap:-

The crowd I engaged to fix the leak dug up the floor, exposed all the pipes and said they could find no leak. The second plumber they sent out (they admitted the first guy was poor) said the leak was coming from the shower in the adjacent bathroom. Evidently, he said the outer ring in the shower tray had not been sealed with silicone when installed by my builder and when the shower tray backed up with water (like when my wife's and daughter's long hair blocked the trap), the excess water seeped down through the outer ring and into the concrete where it resurfaced in the adjacent hallway under the floorboards which is where I spotted the damp patch on the floor. This seemed plausible enough to me. So the exposed pipes were left exposed for the past 6 weeks and still seem dry but admittedly the heating hasn't been on for 6-8 weeks now.

However I looked at the pressure guage in the hotpress last weekend and it was registering near zero, i.e. no pressure. I turned on the pump (not the boiler) and the pressure slowly started to increase to about 1 bar until I turned the pump off. Does this mean that I definitely do still have a leak somewhere (and by turning on the pump, the system refilled itself which caused the pressure guage to increase) or is there another reason why the pressure guage was registering near zero?

The crowd I engaged to fix this leak rang this morning (hadn't heard from them in 5 weeks) and are demanding payment (it was supposed to be an insurance claim so they want me to sign the claim form - however I might just pay them myself as they are claiming just €600) and feel that I'm just stalling them - which I'm not. I was happy enough that they had solved my problem until I looked at the pressure guage last weekend. They are not interested in my report of the pressure guage indication. Furthermore, they won't re-instate the floor until I pay them.

Joey the lips

Dave with the boiler off the pressure would be near zero. Its when it on that it matters.

I am worried about the so called leak around the shower tray. Most wastes come with a seal and while it actually seems plausable to you I would imagine the water to come up around the tray rather a distance away.

However if you cant find a leak you cant find a leak. Tell the crowd that done the report that you want a receipt saying that they cant find a leak and where they looked before paying.

JohnnieK

If its a sealed system the pressure should stay the same as it was on the first cold feed. It should rise by about half a bar when operating but never drop. If it has dropped to zero then something is wrong. Mark where you have it now on the gauge and monitor it.