Navien LCB700 Fault codes & diagnostics

Your boiler has detected that it is getting too hot and has automatically shut down to prevent damage to its internal parts.

Your boiler is trying to start but the flame is failing to ignite, meaning you currently have no heating or hot water.

Your boiler has detected a flame inside when it is not supposed to be burning, so it has shut itself down as a safety precaution.

Your boiler has stopped because the internal flame has gone out, meaning it cannot heat your water or home.

Your boiler has detected that parts inside are getting dangerously hot and has shut itself down to prevent any damage.

Your boiler has detected that the gases leaving the flue are getting too hot, so it has safely shut itself down to prevent damage.

Your boiler has detected that parts of its internal heating system have reached a temperature that is too high, so it has safely shut itself down as a precaution.

Your boiler has detected that parts of its internal heating system are getting dangerously hot and has shut itself down to prevent damage.

Your boiler is unable to get the fuel it needs to start, so it has shut down to prevent damage.

Your boiler's air circulation system is struggling to start or run properly, which prevents the unit from firing up safely.

Your boiler is struggling to detect the necessary airflow required to operate safely, which has caused it to shut down to prevent any risk.

Your boiler has detected that the temperature near the burner is not behaving as expected, so it has shut down to keep your home safe.

Your boiler has detected an issue with the internal air pressure tube, which prevents it from safely managing the combustion system.

Your boiler has lost the ability to read the temperature of the water being sent to your radiators, so it has shut down to prevent overheating.

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

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

Your boiler is struggling to accurately measure the water pressure inside the system, which is preventing it from heating your home safely.

Your boiler is struggling to detect the temperature of your hot water, which means it will stop heating your taps until the faulty sensor is fixed.

Your boiler is currently unable to sense the temperature of the hot water it is producing, which prevents it from providing you with a reliable supply of hot water.

Your boiler is having trouble controlling the temperature of the water being sent to your radiators, causing it to shut down to prevent damage.

Your boiler's hot water sensor has stopped sending a signal, which means it cannot tell how hot the water is and has stopped heating it to prevent overheating.

Your boiler has detected an internal communication error with its electronic brain, meaning it has safely shut itself down to prevent unreliable operation.

Your boiler’s internal computer has identified an error in how its internal configuration switches are set, meaning it cannot operate safely until these are corrected.

Your boiler's computer memory has encountered a serious internal error and can no longer process instructions correctly, meaning the unit cannot operate.

Your boiler's internal computer is experiencing a temporary processing error that is preventing it from functioning correctly.

Your boiler's internal computer is failing to talk to its control screen, which usually means the system cannot safely operate or provide instructions to your heating components.

Your boiler's electronic control system has encountered a temporary processing glitch and has locked itself out to prevent any potential issues.