Boiler displays error code 29, low system pressure, boiler shuts down

Warning: Do not over-pressurise the system. Typical cold pressure is 1.0–1.5 bar. Never exceed the red zone on the gauge.

• Check pressure gauge: If below 1.0 bar, top up using the filling loop according to the user manual until it reaches 1.0–1.5 bar.
• Bleed radiators: After topping up, bleed radiators to remove air, then re-check and adjust pressure.
• Check for leaks: Inspect radiators, valves, and visible pipework for signs of water. Also check the pressure relief valve discharge pipe outside for dripping.
• Monitor pressure: If pressure drops repeatedly, the expansion vessel may be flat or there may be a hidden leak. An engineer should test the expansion vessel charge and inspect the system.
• If pressure is normal but code persists: The pressure sensor may be faulty and will need testing and replacement by an engineer.