Weil-McLain Combi Boiler Error Codes
Weil-McLain Evergreen and Ultra boilers display descriptive faults on the control module. Note the message 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 778-909-5731Weil-McLain fault codes (11)
Ignition LockoutUrgentFailed to detect a flame after ignition attempts.Flame LossUrgentFlame signal lost during firing.High Limit LockoutUrgentOver-temperature high-limit tripped.Supply Temp SensorModerateSupply sensor open or shorted.Return Temp SensorModerateReturn sensor open or shorted.Flue Temp SensorUrgentFlue sensor fault or flue over-temp.Blower FaultUrgentCombustion blower speed fault.Low Water PressureModerateSystem pressure below minimum.Pressure Switch FaultUrgentAir/flue pressure switch did not close.Gas Valve FaultUrgentGas valve relay or modulation fault.Internal FaultModerateControl module internal error.