Boiler frequently loses pressure and requires regular topping up of system water.

Safety: Hot water under pressure can cause burns. Allow system to cool before working on it.

• 1. Inspect visible piping: Look for damp spots, stains, or drips on all accessible heating pipes, radiators, and manifolds.
• 2. Check relief valve outlet: Place a container under the pressure relief valve discharge and monitor for intermittent dripping.
• 3. Examine expansion tank: Tap the tank; if it sounds full of water and system pressure swings widely, the tank bladder may have failed.
• 4. Professional leak detection: If no obvious leaks are found, a heating professional should pressure-test the system and replace any faulty components.