How do I repressurise a Glow Worm Compact 24c boiler?

To repressurise a Glow-worm Compact 24c combi boiler, follow the simple steps below. This is a common issue after bleeding radiators, as air release causes the pressure to drop.

???? How to Repressurise Your Glow-worm Compact 24c Boiler

???? What You’ll Need:
• Access to the filling loop (usually a silver braided hose beneath the boiler)
• A watchful eye on the pressure gauge (should be visible on the front panel)

? Step-by-Step Instructions:

1. Locate the Filling Loop
• Look under the boiler for a flexible braided hose connecting two copper pipes.
• On either end of this hose, there will be one or two black or grey tap-style valves (or flathead screwdriver-style).

2. Ensure Boiler Is Off and Cooled
• Turn off the heating and allow the system to cool if it’s been running.
• This gives a more accurate pressure reading.

3. Open the Valves Slowly
• Turn both valves (if there are two) slowly to the open position (quarter turn usually).
• You should hear water flowing into the system.

4. Watch the Pressure Gauge
• Keep an eye on the gauge — your target is between 1.0 and 1.5 bar.
• As soon as it reaches the target zone, close both valves immediately.

5. Restart the Boiler
• Turn the boiler back on and reset it if needed.
• Check for normal operation — heating and hot water should now work as expected.

?? Important Notes:
• Never over-pressurise: if you go above 2.5 bar, the pressure relief valve may open.
• If the system keeps losing pressure, it may indicate a leak or failing expansion vessel.
• If you’re unsure whether the filling loop is internal or external, check the manual or send a photo — some models have an integrated filling link.

Let me know if you’d like a diagram or if you’re not seeing the filling loop under your boiler — happy to guide you through with a photo if needed.