E118
Low water pressure
The boiler has detected system water pressure below approximately 0.5 bar.
What this code means
The boiler has detected system water pressure below approximately 0.5 bar.
Possible causes
- Low system pressure
- Water loss or leak
- Recent bleeding of radiators
- Pressure-sensor or expansion issue
Common symptoms
- E118 displayed
- Boiler may stop heating
- Pressure gauge reads low
Checks to make
- Check the pressure gauge/display
- Repressurise only if the appliance instructions allow and you are competent
- Check for leaks if pressure drops again
Safety
- Do not remove the boiler casing or work on gas, combustion, flue or internal electrical components unless appropriately qualified. If gas is suspected, follow the national gas-emergency procedure.
Model notes
Baxi fault-code availability varies by boiler family and control platform.