Combi boiler – how to repressurize

How to repressurize your combi boiler

If your property has a combi boiler, your heating and hot water is supplied from it. One of the most common reasons for a loss of heating or hot water is a drop in the boiler pressure. It is often a simple fix which a tenant can take care of.


What causes a drop in pressure?

A number of things can cause pressure to drop. It may be that there is a leak somewhere in your boiler system. Or, if you bled your radiators recently, it may be that pressure was lost then.

However, you may not be able to tell that you have a problem until you check the pressure gauge. A water leak, for instance, may be tiny and go unnoticed at first, only to develop into a larger problem down the line.


Checking your pressure gauge

Check the water pressure gauge or indicator, which is typically on the front of your boiler. For most boilers, this should be set around the 1 bar. The position set when the boiler was installed is sometimes shown by a red indicator needle.


How to tackle lost pressure

Each boiler will come with specific instructions about its pressure system. Check your user manual to see if you can re-pressurise your boiler yourself. If you do not have a manual, google the make and model of the boiler to find it. You can also use Youtube to find useful how to guides. Here is a guide for a typical modern boiler:


Should this not resolve the issue then please call you Property Manager.