BoilerFaultCodes Err HJ-09 Your boiler has detected that there is not enough water pressure in the system to operate safely, which has caused it to shut down.
Your boiler has detected that there is not enough water pressure in the system to operate safely, which has caused it to shut down.
What to check first
- Locate the metal braided filling loop underneath or near your boiler.
- Slowly open the valve(s) to allow water into the system while watching the pressure gauge.
- Close the valves tightly once the pressure reaches between 1.0 and 1.5 bar.
Parts commonly replaced
- Filling loop
- Pressure sensor
- Expansion vessel