Code decoder
Rational error codes
Pick the maker and the equipment, or type the code. Each page says what the code means on that control, what is safe to check and when to stop.
- Codes
- 2,442
- Makers with codes
- 98
- Updated
- November 2026
Ignition controller error 22Rational Combi Oven Error Code 22: Top Burner Not IgnitingIgnition controller error 38Rational Combi Oven Error Code 38: Flame After Bottom Valve ClosesIgnition controller error 42Rational Combi Oven Error Code 42: Bottom Burner Not IgnitingService 10Rational Combi Oven Error Code Service 10: High Water at SC PumpService 11Rational Combi Oven Error Code Service 11: CDS Sensor Too Many PulsesService 110Rational Combi Oven Error Code Service 110: CleanJet+care Cleaning MessageService 12Rational Combi Oven Error Code Service 12: CDS Sensor No SignalService 120Rational Combi Oven Error Code Service 120: Care Pump or ElectrodeService 14Rational Combi Oven Error Code Service 14: Level Electrode No WaterService 140.4Rational Combi Oven Error Code Service 140.4: Gas Warning Level 1-2Service 140.8Rational Combi Oven Error Code Service 140.8: Gas Lockout WarningService 20.xRational Combi Oven Error Code Service 20.x: Temperature SensorService 23Rational Combi Oven Error Code Service 23: Steam Relay ShortService 24Rational Combi Oven Error Code Service 24: Hot Air Relay ShortService 25Rational Combi Oven Error Code Service 25: CleanJet Water FlowService 26Rational Combi Oven Error Code Service 26: Drain Valve Stuck ClosedService 27Rational Combi Oven Error Code Service 27: Drain Valve Won't CloseService 28Rational Combi Oven Error Code Service 28: Steam Generator Too HotService 29Rational Combi Oven Error Code Service 29: Control Board Too HotService 31.xRational Combi Oven Error Code Service 31.x: Core Probe Reading WrongService 32.x (gas)Rational Combi Oven Error Code Service 32.x (gas): Ignition BoxService 32.xRational Combi Oven Error Code Service 32.x: Gas Combustion LockoutService 33 (gas units)Rational Combi Oven Error Code Service 33: Gas Unit MessageService 33.xRational Combi Oven Error Code Service 33.x: Gas Blower ControlService 34.xRational Combi Oven Error Code Service 34.x: Bus Signal ProblemService 35Rational Combi Oven Error Code Service 35: UltraVent DisconnectedService 36Rational Combi Oven Error Code Service 36: P1 Sensor DefectiveService 37Rational Combi Oven Error Code Service 37: P1 Reading Out of RangeService 40Rational Combi Oven Error Code Service 40: Care Pump Not DeliveringService 41Rational Combi Oven Error Code Service 41: Solenoid Y3 or MoisteningService 42Rational Combi Oven Error Code Service 42: Care Valve Y4 or HoseService 43Rational Combi Oven Error Code Service 43: Valve Passing WaterService 44Rational Combi Oven Error Code Service 44: No Steam During CleanJetIgnition controller error 17Rational Combi Oven Ignition Controller Error 17: Flame Before GasIgnition controller error 18Rational Combi Oven Ignition Controller Error 18: Flame After ShutoffIgnition controller error 37Rational Combi Oven Ignition Controller Error 37: Bottom Burner Flame
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Code not listed, or no code at all?
A unit that shows nothing often points to power or the control. Call us with the maker and model number and we talk it through.