Potterton showing E119 in Oldbury? System pressure has dropped. How to confirm it on the gauge, top up safely, and tell a one-off from a leak.
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Look with the heating cold. Well below one bar confirms E119. Your manual or the label inside the boiler gives the exact pressure it wants.
Potterton combis use a filling loop or key under the boiler. Open it slowly and watch the gauge rise. Close it fully at the target, then reset.
Look for radiator valves with a green crust, a drip from the pipe on the outside wall, and joints under the boiler. Kitchen cupboards hide a lot.
Losing pressure over and over wears the boiler and pulls in fresh oxygenated water. An engineer can check the expansion vessel and relief valve.
The engineer compares the gauge with the vessel pressure, then checks every valve and joint they can reach. A pressure test settles which side of the boiler is losing water.
A photo of the gauge, one of the outside pipe and one of the boiler underneath. Say how often it drops. A line on any damp patch helps as well.
E119 on a Potterton is the low pressure code. The sealed heating system has lost enough water that the boiler refuses to fire.
On most combis in Oldbury the gauge is on the front panel, or the display itself shows the pressure. Cold, around one bar is the usual target.
One top-up after bleeding radiators is routine. A system that needs refilling again within weeks has water escaping, and that needs finding. In the older Rood End terraces, boxed-in pipework can hide a slow weep for a long time.
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Very likely. That pipe is the relief valve outlet, and a drip usually means pressure has been too high at some point.
In a healthy system, months. If you are topping up every week, book a check rather than living with it.
Where the water goes. A valve or a vessel is a short job. A joint behind boxed-in pipework takes longer. You are told which it is before work starts.
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