No/Low Pressure

NO/LOW PRESSURE: If you have a combi boiler at your property normally identified if you have instant hot water at tap outlets, and no hot water cylinder/tank, these rely on the system having a set amount of pressure in the system. Normally the boiler should not loose this pressure, but sometimes over a long period, or when you have bled radiators, or had a small leak this pressure can drop below the pressure needed for the boiler to operate which is normally 1.0 – 1.5 Bar when cold. On the boiler control panel or attached to the boiler pipe work below should be a pressure gauge that normally would look like Fig 1. If the needle is in or near the red then more water pressure is required.

Fig 1

Please click on the image above which looks like your filling loop which will take you to a video.

Some boilers & have a Standard filling loop or filling tap on pipework: This will usually look like a small silver braided hose linking two of the plumbing & heating system pipes together. It is usually on the pipework directly underneath the boiler, although it can sometimes be found under the kitchen sink or in the airing cupboard – there is no set rule about where to locate these devices so you may need to have a look around. See Fig 2

Fig 2

A filling loop will typically have a tap or a small lever of some kind on each end of the hose, although sometimes it is a screwdriver slot-type affair. With a filling loop arrangement opening both taps will refill your system, it usually refills very quickly so be careful not to operate it for too long. Very importantly you must remember to close both taps following refill and if possible remove the hose. DO NOT GO ABOVE 1.5 Bar under any circumstances.