Boiler noisy or going to overheat — Circulation or pump issue

What does Noisy/Overheat mean?

The boiler makes excessive noise or frequently reaches an overheat condition, indicating a problem with water circulation or the pump.

• Incorrect plumbing (primary flow and return pipes crossed or pump fitted backward)
• Improper pump wiring preventing pump overrun
• An unflushed heating system with debris
• Faulty circulation pump

Click steps to track your progress.

1. 1

   Check the boiler's pressure gauge and ensure the system pressure is within the recommended range (e.g., 1 to 1.5 bar). Top up if needed.

2. 2

   Bleed radiators to remove any trapped air from the heating system, as air can cause noise and reduce circulation.

3. 3

   If the boiler is excessively noisy, try resetting it via the user control.

4. 4

   For persistent noise or overheating, a qualified service engineer needs to check pipework, pump operation, and system cleanliness.