Navien NCM 1130HH Fault codes & diagnostics

Your boiler has detected a minor internal software glitch and has temporarily stopped working to protect itself.

Your boiler has detected an internal software or hardware error that prevents it from operating safely.

Your boiler has lost communication with an extra system control module, which usually means the unit cannot coordinate its advanced heating zones properly.

Your boiler has lost communication with an extra control module used to manage complex heating setups or multiple zones.

Your boiler has temporarily stopped working because the water pressure inside the system has dropped too low to operate safely.

Your boiler has temporarily stopped working because an internal safety thermostat detected that the water inside the heating pipe has become too hot.

Your boiler has temporarily stopped working because the pipe that drains away waste water is blocked or frozen, causing a safety switch to activate.

Your boiler has detected an issue with the water pressure or flow sensor in the heating system, which causes it to shut down to prevent damage.

Your boiler's computer system has detected an internal settings error and cannot start up safely.

Your boiler has encountered an unrecognized internal communication error and needs an engineer to inspect the control software.

Your boiler has detected an issue with one of its internal temperature sensors, which has temporarily stopped it from working safely.

Your boiler has temporarily shut down because the internal temperature has risen too high.

Your boiler has detected an internal temperature sensor issue, meaning it cannot accurately measure the heat and has safely shut down to prevent damage.

Your boiler has detected that the burner has unexpectedly gone out while trying to run.

Your boiler has temporarily stopped working because the secondary burner has lost its flame, meaning you currently have no heating or hot water.

Your boiler has lost communication with its main electronic control unit, meaning it cannot safely start up or operate.

Your boiler has lost internal communication with its main control unit, meaning it has temporarily shut down for safety.

Your boiler's main control unit has experienced an internal startup error and cannot safely boot up.

Your boiler has detected that the internal fan responsible for safely clearing exhaust gases is not spinning at the correct speed.

Your boiler's internal fan failed to reach the required speed during its startup check, preventing the system from safely igniting.

Your boiler has detected an issue with an internal valve that regulates water flow, meaning it cannot operate safely and has shut down.

Your boiler has detected an internal calibration error with its gas valve during startup, meaning it cannot safely regulate the fuel supply to ignite.

Your boiler has temporarily stopped because the temperature sensors detected that parts of the heating unit are getting much hotter than others.

Your boiler has detected that the water pressure inside the system is currently too high, so it has safely stopped working until the pressure is reduced.

Your boiler has detected that the water pressure inside the system is too low for it to operate safely.

Your boiler has detected that water is dangerously low or missing inside the system, and has shut down to prevent severe internal damage.

Your boiler has detected an issue with water flow while trying to remove air from the system, which temporarily stops it from working properly.

Your boiler has stopped working because it cannot detect enough water flowing through the system to operate safely.

Your boiler is not detecting any water flowing through the system when you try to run the hot tap, so it cannot switch on to heat the water.

Your boiler is temporarily shutting down because the water inside is getting too hot, usually caused by a blockage in water flow.

Your boiler has detected an issue with its internal dynamic absorber component and has temporarily stopped working for safety.

Your boiler has detected an internal safety or ignition system communication fault and has safely locked itself out to prevent unsafe operation.

Your boiler has detected an electrical overload in one of its internal components, causing the system to stop working to protect itself.

Your boiler has temporarily stopped working because an internal safety sensor has detected that the water temperature is getting too hot.

Your boiler has detected that the temperature inside the main engine head is too low, which prevents it from operating safely.

Your boiler has temporarily stopped working because it has detected an excessively high temperature inside its internal cleaning or heat recovery system.

Your boiler has detected that a safety or temperature control sensor is overheating, so it has automatically shut down to protect itself.

Your boiler has detected an issue with the water temperature safety controls and will temporarily stop working to prevent overheating.

Your boiler has detected an internal water temperature or circulation safety issue and has temporarily shut down to prevent damage.

Your boiler has detected that the burner head is running much hotter than it should be and has automatically shut down to protect itself.

Your boiler has detected an internal combustion or water circulation issue that requires a qualified engineer to inspect and resolve safely.

Your boiler has temporarily stopped because a sensor inside detected a flame when the burner should actually be switched off.

Your boiler has detected that a key internal part is much colder than it should be, which safely shuts down the system to prevent damage.

Your boiler has detected an internal temperature sensor failure, meaning it cannot properly monitor its own performance and has safely shut down to prevent damage.

Your boiler has detected a safety sensor issue near the main burner, which causes it to shut down to prevent overheating.

Your boiler's internal computer is failing to communicate properly with the main burner unit during startup.

Your boiler is failing to communicate properly with its internal monitoring systems when trying to start up.

Your heating system has temporarily stopped running correctly while trying to operate independently from the main electricity grid.

Your boiler has detected an internal electronic safety check failure, meaning it has safely shut down to prevent incorrect operation.

Your boiler has lost communication with its internal electricity-measuring meter, which usually points to an internal wiring or control board problem.

Your boiler has stopped working because a software update on the internal control system was interrupted or failed.

Your boiler has lost its internal connection, meaning the main computer cannot talk to the burner control unit.

Your boiler has temporarily lost its internal connection, meaning it cannot properly talk to its main control unit to start up safely.

Your boiler has detected a broken connection or freezing temperature at its internal temperature sensor, causing it to safely shut down.

Your boiler has detected an issue with its internal temperature monitoring startup checks before connecting to the power grid.