How to Check and Repressurise a Boiler
Quick Answer
Check the pressure gauge (should be between 1 and 1.5 bar), open the filling loop valves until pressure rises, then close them.
How to troubleshoot How to Check and Repressurise a Boiler
Low boiler pressure can cause your heating to fail. This guide covers checking the pressure gauge and using the filling loop to repressurise.
Step-by-Step Fix
- Locate the pressure gauge on the boiler front panel – it shows the current water pressure.
- The ideal pressure is between 1 and 1.5 bar when the system is cold.
- If pressure is below 1 bar, locate the filling loop – a silver flexible hose with two valves.
- Open both valves slowly and watch the gauge rise to 1.5 bar.
- Close both valves firmly and check for any leaks.
- Bleed any radiators if needed, then re-check and repressurise again if necessary.
Common Error Codes
| Code | Meaning | Resolution |
|---|---|---|
| Pressure drops quickly | Leak in the system | Check radiators and pipes for visible leaks; call a technician if needed. |
| Pressure too high | Overfilled | Bleed a radiator to release pressure and water. |
Frequently Asked Questions
How often should I check boiler pressure?
Monthly, or whenever the heating system shows signs of inefficiency.
Can I repressurise the boiler while it is running?
It is best to do it when the boiler is off and the system is cold.