CBX 24 & 32 SBX 30 - Trademate Home Page

LED CODE1 2 3 4FAULT/EFFECT REASON ACTION● Check no air is in heat exchanger/CH system● Check pump operation❍❍❍● Overheated appliance Water temperature greater than 105 °C● Check diverter valve operation● Check PCB/X1C connector● Check mains lead to pump● Check flow thermistor● Check gas supply❍❍●❍ No gas/No flame Low gas pressure ● Check gas service cock● Check gas valve and lead● Check detection electrode/lead❍❍●● Lockout flame signal/ No flame signal on ignition, or loss● Check gas supplyLockout after 5 ignitionof signal during operationattempts❍●❍❍ Flue gas sensor/ Flue gas temperature greater than 95 °CNo flame❍●❍● Defective sensor/ Defective flow, return or flue sensorNo flame❍●●❍Defective gas valve/Flame continues afterdemand ends● Check gas valve and lead● Check PCB/X2A & X2B connectors● Check spark generator/spark electrode● Check mains earth lead continuity● Check flue sensor● Check flue system● Check no air is in heat exchanger/CH system● Check pump● Check PCB/PCB connectors● Check flow, return and flue sensors● Check wiring to sensors● Check PCB/X6 & X8 connectors5 sec flame signal afte ● Check gas valve and leadburner is switched off● Check PCB● Check fan● Check mains fan lead & connector❍●●● Defective fan/No flame Missing or Erroneous RPM signal● Check low voltage fan lead & connector● Check PCB/X3 connector● Check pump operation● Check diverter valve operation●❍❍❍ CRC error/No flame Internal Eprom data error ● Check PCB●❍❍● Error in power supply/● Check mains voltageLow mains voltageNo flame● Check PCB connectors● Check water pressure●❍●❍ Water flow failure/ ● Check pumpFlame for a short Sensor temperature differential incorrect ● Check no air is in heat exchanger/CH systemperiod only● Check flow, and return sensors● Check wires to sensors not crossed●❍●● PCB error/No flame Internal error ● Check PCB●●❍❍ BCC error/No flame Incorrect /missing BCC ● Reseat or replace BCC● Check flow, and return sensors●●❍● Differential check faulty/Zero check faulty DHW or CH● Check wires to sensors not crossedFlame for 15 seconds● Check PCB●●●❍ Activate BCC/No flame New BCC ● Press reset to activate●●●● Safety system failure/No flameFailure of internal self checking system ● Check PCB● Check DHW turbine & lead❍❍❍❍ DHW cold Defective DHW turbine or Diverter valve● Check Diverter valve & lead● Check PCB/X4 connector● Check filter in plate heat exchanger● Check power supply❍❍❍❍ No light indication Defective power supply ● Check PCB/X1B connector❍❍❍❍ No flame Faulty connector● Check PCB fuse● Check PCB/X1A connector29