BoilerFaultCodes
The most common Navien faults
Your boiler has detected that the water pressure inside the heating system is too high for it to operate safely.
Locate a radiator in your home with a bleed valveOpen the valve using a radiator key to release a small amount of water into a clothCheck the boiler pressure gauge until it drops into the green zone (usually between 1.0 and 1.5 bar)Close the radiator bleed valve tightly
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Locate the filling loop (usually two silver flexible hoses) underneath the boiler.Open the valves slowly to allow mains cold water into the system.Watch the pressure gauge on the front of the boiler until the needle reaches the green zone (typically 1.0 to 1.5 bar).Close both valves tightly to stop the flow of water.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low.
Locate the internal filling loop (usually a silver braided hose or a plastic linkage under the boiler).Slowly open the valves to allow mains water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close the valves firmly and ensure no water is leaking from the connection points.
Your boiler has detected that it is running out of water inside its internal system, which prevents it from heating your home safely.
Locate the external filling loop, usually a silver flexible hose connected to two valves under the boiler.Gradually open the valves to allow water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close the valves tightly and restart the boiler.
Your boiler has detected an issue with the water pressure level, which is causing it to stop operating to prevent damage.
Locate the filling loop under the boiler, which is usually a silver braided hose or a small plastic key.Open the valve(s) slowly to allow mains water into the system until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.Close the valve(s) tightly and restart the boiler using the reset button.
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Locate the external filling loop, usually found underneath the boiler.Gradually open the filling loop valves to allow water into the system while watching the pressure gauge.Stop filling once the needle reaches the green zone, typically between 1.0 and 1.5 bar.Ensure both valves are fully closed and tight.