Lochinvar Combi Boiler Error Codes
Lochinvar Knight boilers display faults on the Smart System control. Record the fault description and code before calling.
This is not a DIY repair
Combi boilers are gas-fired appliances regulated under the BC Safety Standards Act. Opening the unit, touching the gas valve, or working on the flue without a valid BC gas-fitter licence is both unsafe and illegal. Diagnosing the fault is helpful — fixing it should always be left to a certified technician.
Call 778-909-5731Lochinvar fault codes (12)
Ignition FailureUrgentBoiler failed to establish a flame within the trial period.Flame LossUrgentFlame lost during a heating cycle.High LimitUrgentWater temperature exceeded the high-limit setting.Supply Sensor FaultModerateOutlet temperature sensor out of range.Return Sensor FaultModerateReturn temperature sensor out of range.Flue Sensor FaultUrgentFlue temperature sensor fault or flue over-temperature.Blower FaultUrgentCombustion blower not at commanded speed.Low WaterModerateLow water cutoff / low pressure.Air Pressure FaultUrgentAir/flue pressure switch out of range.Gas Valve FaultUrgentGas valve circuit or modulation fault.Outdoor Sensor FaultLowOutdoor reset sensor fault.Cascade Comm FaultModerateCommunication fault between cascaded units.