What does the Baxi E119 error code mean?
E119 on a Baxi boiler is the low-pressure fault: the system pressure has dropped below roughly 0.5 bar and the boiler has locked out. As with most low-pressure codes, the homeowner can usually fix it by repressurising via the filling loop.
What causes the Baxi E119 fault?
The E119 error on a Baxi boiler is most commonly triggered by:
- A slow leak somewhere in the radiators or pipework
- Air bled from the system lowering the pressure
- A leaking pressure-relief valve discharging outside
- A failed expansion vessel
How to fix the Baxi E119 boiler fault
Follow these steps. If the code returns after you have completed them, stop and call a Gas Safe engineer.
- 1.Check the pressure gauge — if it reads below 1.0 bar, top up via the external filling loop.
- 2.Raise pressure slowly to between 1.0 and 1.5 bar when the system is cold, then close the filling loop.
- 3.Reset the boiler; E119 should clear.
- 4.If it returns within days, you have a leak or a failed expansion vessel — book an engineer.
Frequently asked questions about the Baxi E119
What does E119 mean on a Baxi boiler?
E119 is a low water-pressure fault. The pressure has fallen below roughly 0.5 bar and the boiler has locked out. Re-pressurising via the filling loop to 1.0–1.5 bar usually clears it.
Can I fix a Baxi E119 myself?
Yes. Open the filling loop slowly until the gauge reads 1.0–1.5 bar, close it, then reset. If E119 keeps recurring, you have a leak and need a Gas Safe engineer.