Boiler displays E119, pressure gauge low, boiler will not fire

Safety first: Let the system cool before topping up.

Step-by-step repressurising:

• Locate the pressure gauge and confirm it is below 1.0 bar.
• Find the filling loop (flexible hose with two valves). Open the valves slowly until the gauge reaches 1.2–1.5 bar.
• Close both valves fully and remove the filling loop if it is detachable.
• Reset the boiler and check for normal operation.
• Inspect for visible leaks around radiators, valves, and under the boiler.

If E119 recurs frequently:

• Contact a heating engineer to check the expansion vessel, pressure sensor, and for hidden leaks.