BoilerFaultCodes HJ-09 Your boiler has detected that the water pressure is too low to operate safely, causing it to shut down temporarily.
Your boiler has detected that the water pressure is too low to operate safely, causing it to shut down temporarily.
What to check first
- Locate the filling loop (usually a silver flexible hose) underneath or near the boiler.
- Slowly open the one or two taps/levers on the filling loop until you hear water moving.
- Watch the pressure gauge and close the taps firmly once the needle reaches 1.5 bar.
Parts commonly replaced
- Filling loop valve
- Pressure sensor
- Expansion vessel