Ideal Boilers mini HE C24 Installation And Servicing

FAULT FINDINGmini HE --- Installation & Servicing 4769 MAIN CONTROL P.C.B.OPTICAL INFORMATIONThe main control p.c.b. is provided with three lamps (L.E.D.indicators) A that give optical information during the normaloperation of the boiler or for service and fault fiindingpurpose.Normal operationThe green lamp on the left is directly visible on the controlpanel fascia and it gives information during the normaloperation of the boiler. The other two lamps are normallyswitched off.The following table gives the relationship between the visiblelamp indication and its meaning.Boiler in stand --- by condition.(function control in position).Anti--- freeze system active.A short pulse every 4 seconds(function control in position).Anti--- freeze system active.Boiler ON condition(function control in orposition)1 second ON 1 second OFF(function control in orposition)Very fast pulses (4 per second)Faulty boiler or irregularoperation as:--- Empty primary circuit--- No primary circuit flow--- Lack of burner ignition--- Lack of burner ignition--- Excessive temperature in theprimary circuit.--- Dip --- switch 3 left in the OFFposition--- Faulty temperature probeThe following table gives a summary of the relationshipbetween each of the possible lamp combinations and theirmeaning.Normally operating boilerCH operationDHW operationFrost protect operationDHW operationExcessive temperature on primary circuitFaulty CH temperature probe NTCFaulty DHW temperature probe NTCFaulty primary circuit(no water or absence of flow)Lack of burner ignition (no ignition signal fromthe full seqence ignition device)Ignition gas pressure adjustmentMinimum gas pressure adjustmentLampOFFLampONFlashing lamp, aloneor simultaneouslywith an other lamp.Flashing lamp,alternate withanother lamp.70 DIVERTER VALVE ACTUATORSPINDLE POSITIONTo remove the diverter valve actuator refer to frame 64.The following illustrations indicate the relationship betweenthe electric command coming from the main control p.c.b.and the position of the brass spindle when the boiler operatesin either DHW mode or CH mode.In both figures the relationship between the position of theactuator and the resistance of the motor windings (the motormust be disconnected from the wiring) is also given.bn = brownbu = bluebk = black230 V0 VSpindlevisibleOpen circuit9,4 Kohmbkbnbu3120 V230 VSpindle fullyretractedOpen circuit9,4 Kohmbkbnbu312CH mode DHW modeFAULT FINDING