How to Fix a Boiler Losing Pressure
Quick Answer
Check the pressure gauge, repressurise using the filling loop, and check for leaks.
How to troubleshoot a Boiler Losing Pressure
A boiler losing pressure is a common issue that can affect your heating. This guide covers diagnosing and fixing the problem.
Step-by-Step Fix
- Locate the pressure gauge on the boiler front panel.
- The pressure should be between 1 and 1.5 bar when cold.
- If below 1 bar, locate the filling loop (silver flexible hose).
- Open both valves slowly and watch the pressure rise to 1.5 bar.
- Close both valves firmly and check for any leaks.
- If pressure drops again quickly, there may be a leak in the system.
Common Error Codes
| Code | Meaning | Resolution |
|---|---|---|
| E119 | Low system pressure | Repressurise using the filling loop. |
| Pressure drops quickly | Leak in the system | Check radiators and pipes for visible leaks. |
Frequently Asked Questions
Why does my boiler keep losing pressure?
A leak in the system or a faulty expansion vessel.
Can I repressurise my boiler myself?
Yes, using the filling loop, but check for leaks afterwards.