Rinnai Combi Boiler Error Codes
Rinnai combi boilers and tankless units display a two-digit code on the controller. Note the code and whether it appears on heating or hot water 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 778-909-5731Rinnai fault codes (17)
10UrgentAir supply or exhaust blockage.11UrgentNo ignition / no flame sensed.12UrgentFlame failure during operation.14UrgentThermal fuse / overheat in the unit.16UrgentOver-temperature warning.19ModerateElectrical grounding fault.25ModerateCondensate drain fault.29ModerateCondensate collar / drain issue.31UrgentCombustion / flame rod fault.33ModerateHeat exchanger outlet thermistor fault.34LowCombustion air temperature sensor fault.52UrgentGas solenoid valve / modulation fault.61UrgentCombustion fan fault.65ModerateWater flow control valve fault.71UrgentGas solenoid valve circuit fault.72UrgentFlame sensing circuit fault.LCModerateScale buildup / maintenance required (limescale).