How to Fix / Troubleshooting

Safety first: Turn off power and allow the system to cool before inspecting for leaks.

Step 1 – Inspect visible piping: Look for damp spots, corrosion, or staining on pipes, radiators, and around the boiler.
Step 2 – Check relief valve outlet: Place a container under the relief valve discharge pipe and monitor for intermittent dripping.
Step 3 – Examine automatic air vents: Check top‑mounted air vents for signs of water leakage. Replace any vents that weep.
Step 4 – Pressure test: A professional can isolate the boiler and perform a pressure test to determine if the leak is in the boiler or the system piping.

Do not continually add fresh water without finding the leak; this introduces oxygen and accelerates corrosion.

Boiler frequently loses pressure and needs to be topped up

Possible Causes