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Zanussi ULTRA SYSTEM 15 Installation And Servicing
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52FAULT FINDINGFAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDINGInstallation and Servicing66 ALTERNATING ‘L’ AND ‘6’ - FALSE FLAME LOCKOUTRestart the boiler, does Boiler Work OK?NOCheck routing and integrity of internal boilerwiring is OK. Check condition of Flame SenseElectrode and replace if deteriorated.Separate the flame detection electrode in-lineconnector. Is there continuity between the terminalspins connected to the electrode?YESReplace Flame Detection ElectrodeCheck routing and integrity of internal boiler wiring.YESNO67 ALTERNATING ‘F’ AND ‘1’ - LOW WATER PRESSUREIs the Boiler and CH System filled with water and allisolation and radiator valves open (check pressuregauge is between 1 to 1.5 bar)?NO Fill and vent the system and open all isolation valves68 ALTERNATING ‘F’ AND ‘2’ - FLAME LOSSDoes the boiler ignite for a shorttime and then extinguish?YESIs the Gas Pressure available atthe Boiler Inlet (18 mbar)?Check the detection electrode andassociated harness for: continuity,visual condition and position (Referto Frame 47). Check if condensatepipe is blocked. Check if flue isblocked.Replace as necessaryNO Check gas supply andrectify faultNOYESIs 215Vdc supply available at the GasValve while the flame is on? (* See note)YESCheck spark generator and associatedharness for: continuity and visualcondition. (Refer to Frame 48) Are thesefunctioning correctly?YESCheck ignition electrode and associatedharness for: continuity, visual conditionand position. (Refer to Frame 46) Arethese functioning correctly?YESCheck siphon and condensate drain pipework for blockage and rectify if necessary.Boiler now working OK?Check wiring from gasvalve to PCB for continuity.If the wiring is OK thenreplace the PCBNOReplace Spark Generatorand Harness as necessary.NOReplace IgnitionElectrode andassociated harness asnecessaryNOReplace Gas ValveNO* Note: due to the wave form ofthe rectified voltage, the readingwill vary depending on the type ofmeter used to measure the value.In general terms a reading greaterthan 150V indicates that the correctvoltage is supplied to the gas valve.69 ALTERNATING ‘F’ AND ‘3’ - FAN FAULTDoes the wiring from the Fan to the PCB have secure connections atboth ends and has not deteriorated? Does the wiring have continuity?YESRectify Wiring & connectionsIs there 230Vac at the Blue and Brown connectionsto the 3 way connection on the Fan?NOReplace PCBReplace FanNOYESYESAre connections on water pressure sensor secure?RESTART PROCEDURE - To restart boiler, turn mode knob to restart position and immediately turn knob back to required setting.NOYESRe-fit connectionsReplace water pressure sensor |
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