Noritz NR501-OD Service Manual

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Noritz NR501-OD Service Manual Manual pdf 28 page image

Error Codes and CheckpointsFlame Rod circuit abnormality(Detection of flame when noflame is present)Check for abnormal combustion.Check flue for blockage or obstruction.Check flue and air inlet for blockage or obstruction.Check connection from Remote Controller to Circuit Board.Check Remote Controller and Circuit Board for damage.Check for improper setting of maintenance writers on Circuit Board.Remote Controller transmissionabnormalityCircuit Board setting abnormality(Improper maintenance writerssettings)Circuit Board failure.Measure the resistance through the Thermistor-Cold Water ( 4 ). Check for improperconnection of Thermistor-Cold Water.Measure the resistance through the Thermistor-Hot Water ( 5 ).Check for Gas Proportioning Valve ( 18 ).Check for Manifold Pressure.Diagnosis Point (Trouble Point)Flame Rod does not detect flame(Flame fault detection)Thermistor - Hot WaterabnormalityCircuit Board abnormalityThermistor - Heat ExchangerabnormalityFailure of Gas Solenoid Valve(or Gas Solenoid Valve drivecircuit abnormality)Gas Solenoid Valve drive circuitabnormalityCircuit Board abnormalityFan Motor abnormalityCircuit Board failure.Thermistor - Air abnormalityHigh Limit Switch triggeredAbnormally high outputtemperatureOverheat Prevention Device(Thermal Fuse) triggeredThermistor - Cold WaterabnormalityDisplayWindowDescriptionMeasure the current from the Flame Rod when there is no flame( 9 ).Check for a ground fault.Check the gas supply piping and pressure. Check for Igniterspark ( 13 ). Check Gas Solenoid Valves ( 14,15,18 ).Check Flame Rod ( 10 ). Check ground, paying special attention tothe ground connection to the Circuit Board.Check for accidental extinction of the flame. Check for abnormalcombustion. Check Gas Solenoid Valves ( 15,16,18 ). CheckFlame Rod ( 10 ). Check improper connection of earth cable.Check for melting or damage to the Thermal Fuse ( 1 ).Check for improper connection of Thermal Fuse.Check if High Limit Switch is triggered ( 19 ).Check for improper connection of High Limit Switch.Measure the resistance through the Thermistor-Air ( 8 ). Check for improper connection ofThermistor-Air.Measure the resistance through the Thermistor-Heat Exchanger( 6 ). Check for improperconnection of Thermistor-Heat Exchanger.Thermistor - ExhaustabnormalityMeasure the resistance through the Thermistor-Exhaust ( 7 ). Check for improper connectionof Thermistor-Exhaust.Check that the fan is rotating and check the pulse frequency fromthe fan rotational frequency sensor ( 11,12 ). Check for improperconnection of the fan. Check voltage from Circuit Board.To reset this error code, the power needs tobe disconnected and then reconnected.RemarksMeasure the resistance through the Thermistor-Hot Water ( 5 ). Check for improperconnection of Thermistor-Hot Water.Check for improper connection of the Gas Solenoid Valves.Check for damage to the Gas Solenoid Valve connections.Circuit Board FailureTo reset this error code, the power needs tobe disconnected and then reconnected.To reset this error code, the power needs tobe disconnected and then reconnected.To reset this error code, the power needs tobe disconnected and then reconnected.To reset this error code, the power needs tobe disconnected and then reconnected.Combustion abnormality(Unit shuts off)Check gas typeImproper gas typeCheck for abnormal combustion ( 7 ).Exhaust temperature is too highCondensate Container clogging Check if the drain line is clogged or frozen ( 20 ).Error CodesRemoteController1176090737271703332355191946131301614122011331321351,3535151161131130114121122209073172717091941Check connection from Display Window to Circuit Board.Check Display Window and Circuit Board for damage.Display Window transmissionabnormality76768To reset this error code, the power needs tobe disconnected and then reconnected.Check for abnormal combustion.Check flue and air inlet for blockage or obstruction.Check that flame ignites all across the burner.Check Gas Solenoid Valves ( 16,17,18 ).Combustion abnormality(Unit shuts off)902Check for abnormal combustion.Check flue and air inlet for blockage or obstruction.Note 1)Note 1)161162163Circuit Board failure.612614Check the DIP Switch settings.(ex.high elevation, vent length, etc.).Circuit Board failure.Circuit Board setting abnormality(DIP Switch settings)Circuit Board abnormality733Circuit Board failure.Circuit Board abnormality734To reset this error code, the power needs tobe disconnected and then reconnected.Combustion abnormality(Unit shuts off)903 Check for abnormal combustion.Check flue and air inlet for blockage or obstruction.Check for abnormal combustion.Check flue and air inlet for blockage or obstruction.Combustion abnormality(Warning indication)901Air flow abnormality(Unit shuts off)942To reset this error code, the power needs tobe disconnected and then reconnected.To reset this error code, the power needs tobe disconnected and then reconnected.To reset this error code, the power needs tobe disconnected and then reconnected.To reset this error code, the power needs tobe disconnected and then reconnected.To reset this error code, the power needs tobe disconnected and then reconnected.To reset this error code, the power needs tobe disconnected and then reconnected.To reset this error code, the power needs tobe disconnected and then reconnected.To reset this error code, the power needs tobe disconnected and then reconnected.Check for an openCheck for a shortcircuit.circuit.Check for an openCheck for a shortcircuit.circuit.Check for an openCheck for a shortcircuit.circuit.Check for an openCheck for a shortcircuit.circuit.302312332352,354322323Check for an openCheck for a shortcircuit.circuit.Detection tempera-ture abnormalityNoDisplayTo reset this error code, contact the nearestNORITZ agent.Combustion abnormality(Unit is locked)908 Check for abnormal combustion.Check flue and air inlet for blockage or obstruction.To reset this error code, contact the nearestNORITZ agent.Combustion abnormality(Unit is locked)Detect Scale Build-up in the HeatExchanger(Warning indication, and thenUnit shuts off)C~CNote 2)C1~C4Flush the Heat Exchanger to remove the Scale Build-up.Refer to the “Procedure for Flushing the Heat Exchanger”in the Parts List inside pocket of the front cover.If the Heat Exchanger is not flushed, the unit will repeat the warning indication and then shut off.The unit is lockedbefore long.The unit can temporarily operate by reconnecting electrical power until the Heat Exchanger is flushed.Please contact Noritz America for more information about flushing the Heat Exchanger.CFNote 3)CF Detect Scale Build-up in the HeatExchanger(Unit is locked)The unit is locked because of repeated Scale Build-up error code.Must flush the Heat Exchanger to remove the Scale Build-up.Before flushing the Heat Exchanger, please contact Noritz America for more information.Note 1) = 1, 2, 3, 4, 5, 6, 7, 8, 9Note 2) = 1, 2, 3, 4= 1, 2, 3, 4, 5, 6, 7, 8, 9, A, b, C, d, E, FNote 3) = 1, 2, 3, 4, 5, 6, 7, 8, 9, A, b, C, d, E, F7. 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