Glow Worm Boiler Fault Codes

 

Contained at this page are fault codes for various glow worm models. You can use the search boxes to narrow down your fault codes. You can search by fault code or model. Please also note some fault codes will be very similar to Vaillant models as they share similar or identical electronics for some models. Scroll down for tables showing different models.

If there are any fault codes that missing, please feel free to call us or contact us via social media, contact form etc.

The Following table is applicable for the following models

  • Energy
Fault codesRepairMeaningPossible causeModel
F.00LinkFault: Flow temperature sensorNTC plug not plugged in or has come loose, multiple plug on the PCB not plugged in correctly, interruption in cable harness, NTC sensor defectiveEnergy
F.01LinkFault: Return temperature sensorNTC plug not plugged in or has come loose, multiple plug on the PCB not plugged in correctly, interruption in cable harness, NTC sensor defectiveEnergy
F.10LinkShort circuit: Flow temperature sensorNTC sensor defective, short circuit inthe cable harness, cable/casingEnergy
F.11LinkShort circuit: Return temperature sensorNTC sensor defective, short circuit in the cable harness, cable/casingEnergy
F.12 and F.91LinkShort circuit: Cylinder temperature sensorNTC sensor defective, short circuit in the cable harness, cable/casingEnergy
F.13LinkShort circuit: Domestic hot water cylinder temperature sensorNTC sensor defective, short circuit in the cable harness, cable/casingEnergy
F.20LinkSafety switch-oft. Overheating temperature reachedIncorrect earth connection between cable harness and product, flow or return NTC defective (loose connection), black discharge viaignition cable, ignition plug or ignition electrodeEnergy
F.22LinkSafety switch-oft. Low water pressure in the boilerNo or insufficient water in the product, water pressure sensor defective, cable lo the pump or to the water pressure sensor loose/not connected/defectiveEnergy
F.23LinkSafety switch-oft. Temperature difference too great (NTC1/NTC2)Pump blocked, insufficient pump output, air in product, flow and return NTC sensoni connected the wrong way roundEnergy
F.24LinkSafety switch-oft. Temperature rise too fastPump blocked, insufficient pump output, air in product, system pressure too low, non-return valve blocked/incorrectly installedEnergy
F.25LinkSafety switch-off. Flue gas temperature too highBreakin plug connection for optional flue gas safety temperature limiter (STB), break in cable harnessEnergy
F.27LinkSafety switch-off. Fault in flame detectionMoisture on the electronics, electronics (flame monitor) defective. gas solenoid valve leakingEnergy
F.28LinkFault: Ignition unsuccessful when starting upGas meter defeclive or gas pressure monitor has triggered, air in gas, gas flow pressure too low, thermal isolator device (TAE) has triggered, incorrect gas restrictor,incorrect spare gas valve, fault on the gas valve, multiple plug on PCB incorrectly plugged in, break in cable harness,ignition system (ig-nition transformer, ignition cable, ignition plug, ignition electrode) defective, ionisation current interrupted (cable, electrode), incorrect earthing of product. electronics defectiveEnergy
F.29LinkFault: Flame lossGas supply temporarily stopped, flue gas recirculation, incorrect earthing of product, ignition transformer has spark fallureEnergy
F.32LinkFan frost protection function active: Fan speed outside the tolerance valuesPlug on fan not correctly plugged in, multiple plug on PCB not correCUy plugged in, breakin cable harness, fan blocked, Hall sensor defective, electronlcs defectiveEnergy
F.33LinkFan frost protection function active: Air pressure switch faultPressure monitor has not switched or has switched at a fan speed value that is too high (insufficient air supply) | Pressure monitor plug not correctly plugged in, pressure monitor defective, hose removed from between the pressure monitor and silencer, air/flue pipe blockedEnergy
FA9LinkeBUS fault: Voltage too lowShort circuit on eBUS. eBUS overload or two power supplies with different polarities on the eBUSEnergy
F.61LinkFault: Gas valve control systemShort circuit/short to earth in cable harness for the gas valve, gas valve defective (colls shorted to earth), electronics defectiveEnergy
F.82LinkFault: Gas valve switch-off controlDelayed switch-off of gas valve, delayed extinguishing of flame signal,gas valve leaking, electronics defectiveEnergy
F.83LinkFault: EEPROMElectronics defectiveEnergy
F.64LinkFault: Electronics/sensor/analogue-to-digital converterFlow or return NTC short circuited, electronics defectiveEnergy
F.85LinkFault: Electronics temperature too highElectronics overheating due to external influences, electronics defectiveEnergy
F.67LinkValue sent back by ASIC is incorrect (flame slgnal)Implausible flame signal, electronics defectiveEnergy
F.88LinkFault: Unstable flame (analogue input)Air in gas, gas flow pressure too low, incorrect air ratio, incorrect gas restricter, ionisation flow interruption (cable, electrode)Energy
F.70LinkInvalid product code (DSN)Display and PCB replaced alsame time and Device Specific Number not reset, wrong or missing output range coding resistanceEnergy
F.71LinkFault: Flow/return temperature sensorFlow temperature sensor signaling constant value: Flow temperature sensor incorrectly positioned on supply pipe, flow temperature sensor defectiveEnergy
F.72LinkFault: Deviation in the water pressure sensor/return temperature sensorFlow/return NTC temperature difference too great -> flow and/or return temperature sensor defectiveEnergy
F.73LinkFault: Water pressure sensor not connected or has short-circuitedInterruption/short circuit of water pressure sensor, lntarrupaon/short circuit to GND in supply line to water pressure sensor or water pressure sensor defectiveEnergy
F.74LinkFault: Electrical problemin the water pressure sensorLine to water pressure sensor has a short circuit to 5 V/24 V or internal fault in the water pressure sensorEnergy
F.75LinkFault: Pressure sensorPressure switch defectiveEnergy
F.78LinkThe safety cut-out in the primary heat exchanger is defectiveSafety cut-out feedback does not match the gas valve feedbackEnergy
F.77LinkFault: Condensate or smokeNo response, flue non-return flap defectiveEnergy
F.78LinkInterruption to DHW outlet sensor at external controllerUK ink box is connected, but hot water NTC not bridgedEnergy
F.83LinkFault: Burner temperature sensorBurner temperature sensor is defective| When the burner starts, the temperature change registered at the flow or retum temperature sensor is non-existent or too small: insufficient water in the product, the flow or retum temperature sensor is not in the correct position on the pipeEnergy
F.84LinkFault: Flow/return temperature sensorValues not consistent, difference < -6 K | Flow and return temperature sensors signalling implausible values: Flow and return temperature sensors have been inverted, flow and return temperature sensors have not been correctly InstalledEnergy
F.85LinkFault: Temperature sensorThe flow and/or return temperature sensors have been installed on the same pipe/incorrect pipe | Temperature sensor not connected or is connected incorrectlyEnergy
F.88LinkFault: Underfloor heating contactUnderfloor heating contact open, sensor disconnected or defectiveEnergy
F.87LinkFault: ElectrodesElectrodes not connected or they are connected incorrectly, short circuit in the cable harnessEnergy
F.88LinkFault: Gas valveGas valve not connected or it is connected incorrecUy, short circuit in the cable harnessEnergy
F.89LinkFault: PumpPump not connected or it is connected incorrectly, incorrect pump connected, short circuit in the cable harnessEnergy
ConnectionLinkNo communication between the PCB and the user interfaceElectronics defectiveEnergy

The Following table is applicable for the following models

  • Ultracom₂ sxi,
  • Ultracom₂ cxi
  • Ultracom₂ 35 store
  • Betacom a
  • Xtrafast 96/120
  • Xtrafast 96/120E1
CodesRepairDescriptionModel 
ErrLinkUser interface faultUltracom₂ sxi`
ErrLinkUser interface faultUltracom₂ cxi
ErrLinkUser interface faultUltracom₂ 35 store
ErrLinkUser interface faultBetacom a
F00LinkNo faultXtrafast 96/120E1
F00LinkNo faultXtrafast 96/120
F00LinkFlow heating temperature sensor faultUltracom₂ sxi
F00LinkFlow heating temperature sensor faultUltracom₂ cxi
F00LinkFlow heating temperature sensor faultUltracom₂ 35 store
F00LinkFlow heating temperature sensor faultBetacom a
F01LinkReturn heating temperature sensor faultUltracom₂ sxi
F01LinkReturn heating temperature sensor faultUltracom₂ cxi
F01LinkReturn heating temperature sensor faultUltracom₂ 35 store
F01LinkReturn heating temperature sensor faultBetacom a
F02LinkAir flow faultXtrafast 96/120E1
F02LinkAir flow faultXtrafast 96/120
F02LinkHot water temperature sensor faultUltracom₂ 35 store
F03LinkStorage tank temperature sensor faultUltracom₂ 35 store
F04LinkIgnition fault - flame detectionXtrafast 96/120E1
F04LinkIgnition fault - flame detectionXtrafast 96/120
F05LinkOverheatingXtrafast 96/120E1
F05LinkOverheatingXtrafast 96/120
F06LinkCentral heating thermistor/wiring faultXtrafast 96/120E1
F06LinkCentral heating thermistor/wiring faultXtrafast 96/120
F07LinkDomestic hot water thermistor/wiring faultXtrafast 96/120E1
F07LinkDomestic hot water thermistor/wiring faultXtrafast 96/120
F08LinkStorage vessel thermistor/wiring faultXtrafast 96/120E1
F08LinkStorage vessel thermistor/wiring faultXtrafast 96/120
F09LinkSystem pressure sensor faultXtrafast 96/120E1
F09LinkSystem pressure sensor faultXtrafast 96/120
F10LinkFan faultXtrafast 96/120E1
F10LinkFan faultXtrafast 96/120
F10LinkFlow heating temperature sensor faultUltracom₂ sxi
F10LinkFlow heating temperature sensor faultUltracom₂ cxi
F10LinkFlow heating temperature sensor faultUltracom₂ 35 store
F10LinkFlow heating temperature sensor faultBetacom a
F11LinkPoor circulationXtrafast 96/120E1
F11LinkPoor circulationXtrafast 96/120
F11LinkReturn heating temperature sensor faultUltracom₂ sxi
F11LinkReturn heating temperature sensor faultUltracom₂ cxi
F11LinkReturn heating temperature sensor faultUltracom₂ 35 store
F11LinkReturn heating temperature sensor faultBetacom a
F12LinkUser interface faultXtrafast 96/120E1
F12LinkUser interface faultXtrafast 96/120
F12LinkHot water temperature sensor faultUltracom₂ 35 store
F13LinkMain pcb faultXtrafast 96/120E1
F13LinkMain pcb faultXtrafast 96/120
F13LinkStorage tank temperature sensor faultUltracom₂ 35 store
F14LinkCentral heating flow temperature > 97 degreesXtrafast 96/120E1
F14LinkCentral heating flow temperature > 97 degreesXtrafast 96/120
F15LinkGas mechanism faultXtrafast 96/120E1
F15LinkGas mechanism faultXtrafast 96/120
F20LinkCommunication faultXtrafast 96/120E1
F20LinkCommunication faultXtrafast 96/120
F20LinkOverheating faultUltracom₂ sxi
F20LinkOverheating faultUltracom₂ cxi
F20LinkOverheating faultUltracom₂ 35 store
F20LinkOverheating faultBetacom a
F22LinkLow water pressureUltracom₂ sxi
F22LinkLow water pressureUltracom₂ cxi
F22LinkLow water pressureUltracom₂ 35 store
F22LinkLow water pressureBetacom a
F23LinkWater circulation faultUltracom₂ sxi
F23LinkWater circulation faultUltracom₂ cxi
F23LinkWater circulation faultUltracom₂ 35 store
F23LinkWater circulation faultBetacom a
F24LinkWater circulation faultUltracom₂ sxi
F24LinkWater circulation faultUltracom₂ cxi
F24LinkWater circulation faultUltracom₂ 35 store
F24LinkWater circulation faultBetacom a
F26LinkFault in gas valveUltracom₂ sxi
F26LinkFault in gas valveUltracom₂ cxi
F26LinkFault in gas valveUltracom₂ 35 store
F26LinkFault in gas valveBetacom a
F27LinkFlame detection faultUltracom₂ sxi
F27LinkFlame detection faultUltracom₂ cxi
F27LinkFlame detection faultUltracom₂ 35 store
F27LinkFlame detection faultBetacom a
F28LinkIgnition faultUltracom₂ sxi
F28LinkIgnition faultUltracom₂ cxi
F28LinkIgnition faultUltracom₂ 35 store
F28LinkIgnition faultBetacom a
F29LinkLoss of flame during operationUltracom₂ sxi
F29LinkLoss of flame during operationUltracom₂ cxi
F29LinkLoss of flame during operationUltracom₂ 35 store
F29LinkLoss of flame during operationBetacom a
F32LinkIncorrect air pressureUltracom₂ sxi
F32LinkIncorrect air pressureUltracom₂ cxi
F32LinkIncorrect air pressureUltracom₂ 35 store
F32LinkIncorrect air pressureBetacom a
F49LinkEBUS voltage faultUltracom₂ sxi
F49LinkEBUS voltage faultUltracom₂ cxi
F49LinkEBUS voltage faultUltracom₂ 35 store
F49LinkEBUS voltage faultBetacom a
F61LinkFault in the main boardUltracom₂ sxi
F61LinkFault in the main boardUltracom₂ cxi
F61LinkFault in the main boardUltracom₂ 35 store
F61LinkFault in the main boardBetacom a
F62LinkFault in the main boardUltracom₂ sxi
F62LinkFault in the main boardUltracom₂ cxi
F62LinkFault in the main boardUltracom₂ 35 store
F62LinkFault in the main boardBetacom a
F63LinkFault in the main boardUltracom₂ sxi
F63LinkFault in the main boardUltracom₂ cxi
F63LinkFault in the main boardUltracom₂ 35 store
F63LinkFault in the main boardBetacom a
F64LinkFault in the main boardUltracom₂ sxi
F64LinkFault in the main boardUltracom₂ cxi
F64LinkFault in the main boardUltracom₂ 35 store
F64LinkFault in the main boardBetacom a
F65LinkFault in the main boardUltracom₂ sxi
F65LinkFault in the main boardUltracom₂ cxi
F65LinkFault in the main boardUltracom₂ 35 store
F65LinkFault in the main boardBetacom a
F67LinkFault in the main boardUltracom₂ sxi
F67LinkFault in the main boardUltracom₂ cxi
F67LinkFault in the main boardUltracom₂ 35 store
F67LinkFault in the main boardBetacom a
F68LinkFluctuation of flame signalUltracom₂ sxi
F68LinkFluctuation of flame signalUltracom₂ cxi
F68LinkFluctuation of flame signalUltracom₂ 35 store
F68LinkFluctuation of flame signalBetacom a
F70LinkUser interface incompatible with the main boardUltracom₂ sxi
F70LinkUser interface incompatible with the main boardUltracom₂ cxi
F70LinkUser interface incompatible with the main boardUltracom₂ 35 store
F70LinkUser interface incompatible with the main boardBetacom a
F71LinkFlow heating temperature sensor faultUltracom₂ sxi
F71LinkFlow heating temperature sensor faultUltracom₂ cxi
F71LinkFlow heating temperature sensor faultUltracom₂ 35 store
F71LinkFlow heating temperature sensor faultBetacom a
F72LinkPermanent temperature difference between flow and return heating sensorsUltracom₂ sxi
F72LinkPermanent temperature difference between flow and return heating sensorsUltracom₂ cxi
F72LinkPermanent temperature difference between flow and return heating sensorsUltracom₂ 35 store
F72LinkPermanent temperature difference between flow and return heating sensorsBetacom a
F73LinkHeating circuit pressure sensor faultUltracom₂ sxi
F73LinkHeating circuit pressure sensor faultUltracom₂ cxi
F73LinkHeating circuit pressure sensor faultUltracom₂ 35 store
F73LinkHeating circuit pressure sensor faultBetacom a
F74LinkHeating circuit pressure sensor faultUltracom₂ sxi
F74LinkHeating circuit pressure sensor faultUltracom₂ cxi
F74LinkHeating circuit pressure sensor faultUltracom₂ 35 store
F74LinkHeating circuit pressure sensor faultBetacom a
F76LinkThermal fuse faultUltracom₂ sxi
F76LinkThermal fuse faultUltracom₂ cxi
F76LinkThermal fuse faultUltracom₂ 35 store
F76LinkThermal fuse faultBetacom a
F77LinkFault in gas valve motorUltracom₂ sxi
F77LinkFault in gas valve motorUltracom₂ cxi
F77LinkFault in gas valve motorUltracom₂ 35 store
F77LinkFault in gas valve motorBetacom a
F79LinkStorage tank temperature sensor faultUltracom₂ 35 store
F81LinkOverheating of hot water circuitUltracom₂ 35 store
F83LinkNo water in the installationUltracom₂ sxi
F83LinkNo water in the installationUltracom₂ cxi
F83LinkNo water in the installationUltracom₂ 35 store
F83LinkNo water in the installationBetacom a
F84LinkPermanent temperature difference between flow and return heating sensorsUltracom₂ sxi
F84LinkPermanent temperature difference between flow and return heating sensorsUltracom₂ cxi
F84LinkPermanent temperature difference between flow and return heating sensorsUltracom₂ 35 store
F84LinkPermanent temperature difference between flow and return heating sensorsBetacom a
F85LinkFlow and Return heating sensor faultUltracom₂ sxi
F85LinkFlow and Return heating sensor faultUltracom₂ cxi
F85LinkFlow and Return heating sensor faultUltracom₂ 35 store
F85LinkFlow and Return heating sensor faultBetacom a
F86LinkUnderfloor heating contact faultUltracom₂ sxi
F86LinkUnderfloor heating contact faultUltracom₂ cxi
F86LinkUnderfloor heating contact faultUltracom₂ 35 store
F86LinkUnderfloor heating contact faultBetacom a

The Following table is applicable for the following models

  • Xtramax HE
  • Ultrapower sxi
  • Ultracom sxi
  • Ultracom hxi
  • Ultracom cx
  • Ultracom cxi
  • sxi
  • SI
  • hxi f
  • lexicom sx
  • flexicom hx
  • flexicom cx
  • cxi
  • CI
  • Plus CI
Codes DescriptionModel
F1LinkIgnition faultXtramax HE
F1LinkIgnition faultUltrapower sxi
F1LinkIgnition faultUltracom sxi
F1LinkIgnition faultUltracom hxi
F1LinkIgnition faultUltracom cx
F1LinkIgnition faultUltracom cxi
F1LinkIgnition faultsxi
F1LinkIgnition faultSI
F1LinkIgnition faulthxi
F1LinkIgnition faultflexicom sx
F1LinkIgnition faultflexicom hx
F1LinkIgnition faultflexicom cx
F1LinkIgnition faultcxi
F1LinkIgnition faultCI Plus
F1LinkIgnition faultCI
F10LinkCentral return flow thermistorXtramax HE
F10LinkCentral return flow thermistorUltrapower sxi
F10LinkCentral return flow thermistorUltracom sxi
F10LinkCentral return flow thermistorUltracom hxi
F10LinkCentral return flow thermistorUltracom cx
F10LinkCentral return flow thermistorUltracom cxi
F10LinkCentral return flow thermistorsxi
F10LinkCentral return flow thermistorSI
F10LinkCentral return flow thermistorhxi
F10LinkCentral return flow thermistorflexicom sx
F10LinkCentral return flow thermistorflexicom hx
F10LinkCentral return flow thermistorflexicom cx
F10LinkCentral return flow thermistorcxi
F10LinkCentral return flow thermistorCI Plus
F10LinkCentral return flow thermistorCI
F11LinkMain board connection faultXtramax HE
F11LinkMain board connection faultUltrapower sxi
F11LinkMain board connection faultUltracom sxi
F11LinkMain board connection faultUltracom hxi
F11LinkMain board connection faultUltracom cx
F11LinkMain board connection faultUltracom cxi
F11LinkMain board connection faultsxi
F11LinkMain board connection faultSI
F11LinkMain board connection faulthxi
F11LinkFlow and or return thermistor faultflexicom sx
F11LinkFlow and or return thermistor faultflexicom hx
F11LinkFlow and or return thermistor faultflexicom cx
F11LinkMain board connection faultcxi
F11LinkMain board connection faultCI Plus
F11LinkMain board connection faultCI
F12LinkUser interface connection faultXtramax HE
F12LinkConnection fault between main pcb and display pcbsxi
F12LinkConnection fault between main pcb and display pcbSI
F12LinkConnection fault between main pcb and display pcbhxi
F12LinkConnection fault between main pcb and display pcbcxi
F12LinkConnection fault between main pcb and display pcbCI Plus
F12LinkConnection fault between main pcb and display pcbCI
F13LinkPCB memory or sensing faultXtramax HE
F13LinkPCB memory or sensing faultUltrapower sxi
F13LinkPCB memory or sensing faultUltracom sxi
F13LinkPCB memory or sensing faultUltracom hxi
F13LinkPCB memory or sensing faultUltracom cx
F13LinkPCB memory or sensing faultUltracom cxi
F13LinkMain pcb connection faultsxi
F13LinkMain pcb connection faultSI
F13LinkMain pcb connection faulthxi
F13LinkPCB memory or sensing faultflexicom sx
F13LinkPCB memory or sensing faultflexicom hx
F13LinkPCB memory or sensing faultflexicom cx
F13LinkMain pcb connection faultcxi
F13LinkMain pcb connection faultCI Plus
F13LinkMain pcb connection faultCI
F14LinkGas valve control defectiveXtramax HE
F14LinkGas valve control defectiveUltrapower sxi
F14LinkGas valve control defectiveUltracom sxi
F14LinkGas valve control defectiveUltracom hxi
F14LinkGas valve control defectiveUltracom cx
F14LinkGas valve control defectiveUltracom cxi
F14LinkCentral heating flow temperature > 95 degreessxi
F14LinkCentral heating flow temperature > 95 degreesSI
F14LinkCentral heating flow temperature > 95 degreeshxi
F14LinkGas valve control defectiveflexicom sx
F14LinkGas valve control defectiveflexicom hx
F14LinkGas valve control defectiveflexicom cx
F14LinkCentral heating flow temperature > 95 degreescxi
F14LinkCentral heating flow temperature > 95 degreesCI Plus
F14LinkCentral heating flow temperature > 95 degreesCI
F15LinkE-bus voltage failureUltrapower sxi
F15LinkE-bus voltage failureUltracom sxi
F15LinkE-bus voltage failureUltracom hxi
F15LinkE-bus voltage failureUltracom cx
F15LinkE-bus voltage failureUltracom cxi
F15LinkGas valve stepper motor faultsxi
F15LinkGas valve stepper motor faultSI
F15LinkE-bus voltage failureflexicom sx
F15LinkE-bus voltage failureflexicom hx
F15LinkE-bus voltage failureflexicom cx
F15LinkGas valve stepper motor faultcxi
F15LinkGas valve stepper motor faultCI Plus
F15LinkGas valve stepper motor faultCI
F16LinkFlame detection faultXtramax HE
F16LinkFlame detection faultsxi
F16LinkFlame detection faultSI
F16LinkFlame detection faulthxi
F16LinkFlame detection faultcxi
F16LinkFlame detection faultCI Plus
F16LinkFlame detection faultCI
F17LinkPower supply is less than 170vXtramax HE
F17LinkPower supply is less than 170vsxi
F17LinkPower supply is less than 170vSI
F17LinkPower supply is less than 170vhxi
F17LinkPower supply is less than 170vcxi
F17LinkPower supply is less than 170vCI Plus
F17LinkPower supply is less than 170vCI
F18LinkUser interface faultXtramax HE
F18LinkUser interface faultsxi
F18LinkUser interface faultSI
F18LinkUser interface faulthxi
F18LinkUser interface faultcxi
F18LinkUser interface faultCI Plus
F18LinkUser interface faultCI
F19LinkCentral heating thermistor unpluggedXtramax HE
F19LinkCentral heating thermistor unpluggedsxi
F19LinkCentral heating thermistor unpluggedSI
F19LinkCentral heating thermistor unpluggedhxi
F19LinkCentral heating thermistor unpluggedcxi
F19LinkCentral heating thermistor unpluggedCI Plus
F19LinkCentral heating thermistor unpluggedCI
F2LinkFanXtramax HE
F2LinkFansxi
F2LinkFan/APSSI
F2LinkFanhxi
F2LinkFancxi
F2LinkFan/APSCI Plus
F2LinkFan/APSCI
F20LinkSoftware incompatibilityXtramax HE
F20LinkSoftware incompatibilitysxi
F20LinkSoftware incompatibilitySI
F20LinkSoftware incompatibilityhxi
F20LinkSoftware incompatibilitycxi
F20LinkSoftware incompatibilityCI Plus
F20LinkSoftware incompatibilityCI
F22LinkLow water pressure or ignition temperature rise too slowUltrapower sxi
F22LinkLow water pressure or ignition temperature rise too slowUltracom sxi
F22LinkLow water pressure or ignition temperature rise too slowUltracom hxi
F22LinkLow water pressure or ignition temperature rise too slowUltracom cx
F22LinkLow water pressure or ignition temperature rise too slowUltracom cxi
F22LinkLow water pressure or ignition temperature rise too slowflexicom sx
F22LinkLow water pressure or ignition temperature rise too slowflexicom hx
F22LinkLow water pressure or ignition temperature rise too slowflexicom cx
F23LinkWater circulation faultXtramax HE
F24LinkCental heating return temperature > 90 degreesXtramax HE
F24LinkCental heating return temperature > 90 degreessxi
F24LinkCental heating return temperature > 90 degreeshxi
F24LinkCentral heating return temperature > 90 degreesflexicom cx
F24LinkCentral heating return temperature > 90 degreescxi
F25LinkMaximum temperature rise slopeXtramax HE
F25LinkCirculation faultUltrapower sxi
F25LinkCirculation faultUltracom sxi
F25LinkCirculation faultUltracom hxi
F25LinkCirculation faultUltracom cx
F25LinkCirculation faultUltracom cxi
F25LinkPoor circulationsxi
F25LinkPoor circulationhxi
F25LinkCirculation faultflexicom sx
F25LinkCirculation faultflexicom hx
F25LinkCirculation faultflexicom cx
F25LinkPoor circulationcxi
F26LinkMaximum delta temperatureXtramax HE
F26LinkPoor circulationsxi
F26LinkPoor circulationhxi
F26LinkPoor circulationcxi
F3LinkFanXtramax HE
F3LinkFan unable to reach ignition speedUltrapower sxi
F3LinkFan unable to reach ignition speedUltracom sxi
F3LinkFan unable to reach ignition speedUltracom hxi
F3LinkFan unable to reach ignition speedUltracom cx
F3LinkFan unable to reach ignition speedUltracom cxi
F3LinkFan unable to reach ignition speedsxi
F3LinkFan unable to reach ignition speedhxi
F3LinkFan unable to reach ignition speedflexicom sx
F3LinkFan unable to reach ignition speedflexicom hx
F3LinkFan unable to reach ignition speedflexicom cx
F3LinkFan unable to reach ignition speedcxi
F3LinkAir faultCI Plus
F4LinkIgnition faultXtramax HE
F4LinkIgnition faultUltrapower sxi
F4LinkIgnition faultUltracom sxi
F4LinkIgnition faultUltracom hxi
F4LinkIgnition faultUltracom cx
F4LinkIgnition faultUltracom cxi
F4LinkIgnition faultsxi
F4LinkIgnition faultSI
F4LinkIgnition faulthxi
F4LinkIgnition faultflexicom sx
F4LinkIgnition faultflexicom hx
F4LinkIgnition faultflexicom cx
F4LinkIgnition faultcxi
F4LinkIgnition faultCI Plus
F4LinkIgnition faultCI
F43LinkGeneric errorUltrapower sxi
F43LinkGeneric errorUltracom sxi
F43LinkGeneric errorUltracom hxi
F43LinkGeneric errorUltracom cx
F43LinkGeneric errorUltracom cxi
F43LinkGeneric errorflexicom sx
F43LinkGeneric errorflexicom hx
F43LinkGeneric errorflexicom cx
F5LinkOverheat FaultXtramax HE
F5LinkOverheat FaultUltrapower sxi
F5LinkOverheat FaultUltracom sxi
F5LinkOverheat FaultUltracom hxi
F5LinkOverheat FaultUltracom cx
F5LinkOverheat FaultUltracom cxi
F5LinkOverheat Faultsxi
F5LinkOverheat FaultSI
F5LinkOverheat Faulthxi
F5LinkOverheat Faultflexicom sx
F5LinkOverheat Faultflexicom hx
F5LinkOverheat Faultflexicom cx
F5LinkOverheat Faultcxi
F5LinkOverheat FaultCI Plus
F5LinkOverheat FaultCI
F6LinkCentral heating flow thermistorXtramax HE
F6LinkCentral heating flow thermistorUltrapower sxi
F6LinkCentral heating flow thermistorUltracom sxi
F6LinkCentral heating flow thermistorUltracom hxi
F6LinkCentral heating flow thermistorUltracom cx
F6LinkCentral heating flow thermistorUltracom cxi
F6LinkCentral heating flow thermistorsxi
F6LinkCentral heating flow thermistorSI
F6LinkCentral heating flow thermistorhxi
F6LinkCentral heating flow thermistorflexicom sx
F6LinkCentral heating flow thermistorflexicom hx
F6LinkCentral heating flow thermistorflexicom cx
F6LinkCentral heating flow thermistorcxi
F6LinkCentral heating flow thermistorCI Plus
F6LinkCentral heating flow thermistorCI
F7LinkDomestic hot water thermistorXtramax HE
F7LinkDomestic hot water thermistorsxi
F7LinkDomestic hot water thermistorSI
F7LinkDomestic hot water thermistorhxi
F7LinkDomestic hot water thermistorflexicom sx
F7LinkDomestic hot water thermistorflexicom cx
F7LinkDomestic hot water thermistorcxi
F7LinkDomestic hot water thermistorCI Plus
F7LinkDomestic hot water thermistorCI
F70LinkSoftware incompatibleUltrapower sxi
F70LinkSoftware incompatibleUltracom sxi
F70LinkSoftware incompatibleUltracom hxi
F70LinkSoftware incompatibleUltracom cx
F70LinkSoftware incompatibleUltracom cxi
F70LinkSoftware incompatibleflexicom sx
F70LinkSoftware incompatibleflexicom hx
F70LinkSoftware incompatibleflexicom cx
F73LinkUnable to see pump activateUltrapower sxi
F73LinkUnable to see pump activateUltracom sxi
F73LinkUnable to see pump activateUltracom hxi
F73LinkUnable to see pump activateUltracom cx
F73LinkUnable to see pump activateUltracom cxi
F73LinkUnable to see pump activateflexicom sx
F73LinkUnable to see pump activateflexicom hx
F73LinkUnable to see pump activateflexicom cx
F77LinkCondensate pump error (optional)Ultrapower sxi
F77LinkCondensate pump error (optional)Ultracom sxi
F77LinkCondensate pump error (optional)Ultracom hxi
F77LinkCondensate pump error (optional)Ultracom cx
F77LinkCondensate pump error (optional)Ultracom cxi
F77LinkCondensate pump error (optional)flexicom sx
F77LinkCondensate pump error (optional)flexicom hx
F77LinkCondensate pump error (optional)flexicom cx
F8LinkTank thermistorXtramax HE
F8LinkTank thermistor (N/A For this appliance)sxi
F8LinkTank thermistor (N/A For this appliance)SI
F8LinkTank thermistor (N/A For this appliance)hxi
F8LinkTank thermistor (N/A For this appliance)cxi
F8LinkTank thermistor (N/A For this appliance)CI Plus
F8LinkTank thermistor (N/A For this appliance)CI
F9LinkWater pressure sensor fault (please contact GW technical department for further information)Xtramax HE
F9LinkWater pressure sensor fault, blocked flow filter or pump faultUltrapower sxi
F9LinkWater pressure sensor fault, blocked flow filter or pump faultUltracom sxi
F9LinkWater pressure sensor fault, blocked flow filter or pump faultUltracom hxi
F9LinkWater pressure sensor fault, blocked flow filter or pump faultUltracom cx
F9LinkWater pressure sensor fault, blocked flow filter or pump faultUltracom cxi
F9LinkWater pressure sensor fault (please contact GW technical department for further information)sxi
F9LinkWater pressure sensor fault (please contact GW technical department for further information)SI
F9LinkEarlier models only (please contact GW technical department for further information)hxi
F9LinkLow water pressure Sensorflexicom sx
F9LinkLow water pressure Sensorflexicom hx
F9LinkWater pressure sensor fault, blocked flow filter or pump faultflexicom cx
F9LinkWater pressure sensor fault (please contact GW technical department for further informationcxi
F9LinkWater pressure sensor fault (please contact GW technical department for further informationCI Plus
F9LinkWater pressure sensor fault (please contact GW technical department for further informationCI
No display or ErLinkloose connection X51Ultrapower sxi
No display or ErLinkloose connection X51Ultracom sxi
No display or ErLinkloose connection X51Ultracom hxi
No display or ErLinkloose connection X51Ultracom cx
No display or ErLinkloose connection X51Ultracom cxi
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