One of the most common calls we receive from Surrey homeowners is a boiler showing low pressure. The good news: this is often something you can fix yourself in a few minutes. Here is how.
What Pressure Should My Boiler Be At?
Most boilers should sit between 1 and 1.5 bar when cold. Some manufacturers recommend up to 2 bar. Check your boiler manual if unsure. Below 0.5 bar and most boilers will lock out and stop working.
Step-by-Step: How to Repressurise
- Turn the boiler off and let it cool for at least 10 minutes
- Find the filling loop — this is usually a silver braided flexible hose underneath the boiler, with a valve or two at each end
- Slowly open both valves (you will hear water entering the system)
- Watch the pressure gauge — stop when it reaches 1 to 1.5 bar
- Close both valves — make sure they are fully closed
- Restart the boiler
When to Call an Engineer
If you have to repressurise more than once a month, there is an internal leak somewhere in the system. This needs investigating by a Gas Safe engineer before it causes more serious damage.
Call us on 07733 019491 if you are in Surrey — we can diagnose and fix internal leaks the same day.