Installation And Servicing Instructions - Heatingspares247.com

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WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P5.2 FAULT FINDING FLOW CHART - GENERALPRIMARY CHECKSThe following conditions should be checked before commencing the fault finding process.1) A permanent live of at least 190VAC should be present at terminal 1 (PL)2) A signal live of at least 190VAC should be present at terminal 4 (SL)3) Earth continuity should be present at terminal 3 (E)4) All isolating valves should be open and both the system and boiler should be fully vented.5) A gas supply pressure of at least 18 mbar for natural gas or 31 mbar for LP gas is measured at the inlet whenthe boiler fires, or attempts to fire.The Celsius 25 requires a gas supply pipe rated for at least 26.1kW input irrespective of the systemrequirement.6) Check the flue installation is correct and with obstruction of flue or air ducts.NOTE: The Celsius 25 features a 120 seconds anti-cycle/post purge function. Allow 120 seconds to pass beforecommencing fault finding.STARTNB: Once rectified all faults and error displays can be resetby turning the user knob off then on. If the unit will not resetand the fault has been rectified check connections to thefascia PCB. If these are intact the fascia PCB should bereplaced.Is the green mains lamp offYSee mains lamp of f sectionN N NIs the green mains lamp flashingrapidly (5Hz)?Is the green mains lampflashing slow ly?(1 Hz)YYTurn user controlsknob on.Set external system controls tocall the boiler on.Is the user control knob setto maximum?NTurn user control knob fully clockw ise.Y Y YIs the flow temperature andreturn temperature < 72 O C?Is flow thermistor andreturn thermistor betw een0.5 kOhm and 20 kOhm?NNWait for system temperature to coolReplace faulty thermistor.Is lockout lamp (red) flashingonce every 2 seconds ?YSee thermostat overheatsection.NContinued onnext pageInstallation & Servicing Instructions Page : 25
YWD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PContinued fromprevious pageNIs lockout lamp (red) flashingtw ice every tw o seconds?YSee ignition failure sectionNIs lockout lamp (red) flashingthree times every tw o seconds?YIs modulation LED1illuminated?NIs modulation LED2illuminated?NY N NIs the flow thermistoropen circuit?Is there open circuitacross flow thermistorconnections on controlPCB (I)?YYReplace flowthermistor?Wiring betw een flowthermistor and controlPCB faulty?Y N NIs the return thermistoropen circuit?Is there open circuitacross return thermistorconnections on controlPCB (Q)?YYReplace returnthermistor?Wiring betw een returnthermistor and controlPCB faultyReplace control PCB?Replace control PCB?Is lockout lamp (red) flashingfour times every tw o seconds?YIs the static w aterpressure in the system>0.2 bar?YIs the w ater pressuresw itch open circuit?YReplace w ater pressuresw itchNNNRepressurise the systemor increase static head(open vented systems)Is there open circuitacross w ater pressure sw itchconnections on control PCB (J)?NReplace control PCB?Wiring betw een w aterpressure sw itch andcontrol PCB faultyIs lockout lamp (red) flashingfive times every tw o seconds?YSee fan sectionof Ignition Lockout?N NIs lockout lamp (red) flashingfifteen times then offfor tw o seconds?YReset boiler by turning usercontrol knob off then on.Does fault clear?NReplace control PCBReplace control PCBInstallation & Servicing Instructions Page : 36
Page 2 and 3: WD209/1/2000The Keston Celsius 25 &
Page 4 and 5: WD209/1/2000 Chapter 1 : General In
Page 6 and 7: WD209/1/2000 Chapter 1 : General In
Page 8 and 9: WD209/1/2000 Chapter 2 - Boiler Con
Page 18 and 19: WD209/1/2000 Chapter 3 : Installati
Page 20 and 21: WD209/1/2000 Chapter 3 : Installati
Page 22 and 23: WD209/1/2000 Chapter 4 : Commission
Page 24 and 25: WD209/1/2000 Chapter 4 : Commission
Page 26 and 27: WD209/1/2000 Chapter 5 : Fault Find
Page 42 and 43: WD209/1/2000 Chapter 6 : Servicing
Page 44 and 45: WD209/1/2000 Chapter 7 : Replacemen
Page 46 and 47: WD209/1/2000 Chapter 7 : Replacemen
Page 48 and 49: WD209/1/2000 Chapter 8 : Spare Part
Page 50 and 51: WD209/1/2000 Chapter 8 : Spare Part

Installation And Servicing Instructions - Heatingspares247.com

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