Sanyo CH2472, CH1872 Troubleshooting, Precautions before Performing Inspection or Repair

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9. TROUBLESHOOTING

9-1. Precautions before Performing Inspection or Repair

After checking the self-diagnostics monitor, turn the power OFF before starting inspection or repair.

High-capacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an electrical charge (charging voltage DC 310V) even after the power is turned OFF, and some time is required for the charge to dissipate. Be careful not to touch any electrified parts before the controller LED (red) turns OFF.

If the outdoor controller is normal, approximately 30 seconds will be required for the charge to dissipate. However, allow at least 5 minutes for the charge to dissipate if there is thought to be any trouble with the outdoor controller.

9-2. Method of Self-Diagnostics

Follow the procedure below to perform detailed trouble diagnostics.

NOTE

1:If the operation lamp blinks every 0.5 seconds immediately when the power is turned ON, there is an external ROM (OTP data) failure on the indoor circuit board, or a ROM socket insertion problem, or the ROM has not been installed.

2:The failure mode is stored in memory even when the power is not ON. Follow the procedure below to perform diagnostics.

PROCEDURE

After turning on power to the air conditioner, use the remote controller and follow the steps below to execute self-diagnostics.

Step 1: Press and hold the remote controller ION button and 1 HR TIMER button. Then, press and hold the ACL (reset) button with a pointed object such as the tip of a pen. After 5 seconds, release ACL button first, then release ION and 1 HR TIMER buttons, "oP-1" (test run) appears, blinking in the remote controller clock display area.

Step 2: Next, press the 1 HR TIMER button once to change the display from "oP-1" to "oP-3" (self-diagnostics). (The display continues to blink.)

Step 3: Finally press the ON/OFF button to engage self-diagnostics mode.

•The self-diagnostics function utilizes the 3 indicator lamps on the main unit, in combinations of ON lamps, blinking lamps, and OFF lamps, to report the existence of sensor trouble or a protective operation. (The lamps blink or remain ON for 5 seconds, then turn OFF for 2 seconds.) Self-diagnostics is completed when the buzzer sounds 3 short beeps.

•A maximum of 3 self-diagnostics reports are displayed, for 5 seconds each, beginning with the most recent report. Following this display the lamps turn OFF. In order to view the self-diagnostics results again, press the ON/OFF button again.

•The 3 lamps remain OFF if no trouble has occurred.

<IMPORTANT> After self-diagnostics is completed, be sure to press the ACL (reset) button to return to normal mode. The air conditioner will not operate if this is not done.

ION button

<Clock display > Test run mode

Self-diagnostics mode

ON/OFF operation button

1HR.

TIMER button

ACL (Reset) button

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Contents DC Inverter Split System AIR Conditioner Indoor Model No. Product Code NoPlease Read Before Starting Table of Contents Checking Electrical Components Operating Range Indoor Air Intake Temp Outdoor Air Intake TempKHS1872 SpecificationsUnit Specifications CH1872208V KHS2472 CH247212.1 13.5 Major Component Specifications Indoor UnitCB-KHS2472 Microprocessor 250V 3A Compressor Outdoor UnitOutdoor Unit CH1872 External FinishOutdoor Unit CH2472 Compressor temp sensor Other Component SpecificationsIndoor heat exchanger sensor Outdoor air temp sensorDimensional Data Indoor Unit KHS187211-17/32 23-15/16 35-7/16900 Insulation of Refrigerant Tubing Refrigerant Flow DiagramRefrigerant Flow Diagram After a tube has been insulated To break or crackOperating current performance chart Temperature ChartsLow pressure performance chart Indoor discharge air performance chartHigh pressure performance chart Wide 73F Power Supply 230V Single Phase 60Hz Cooling Capacity Cooling Capacity24,200 BTU/h Cooling Capacity Low Ambient Indoor Outdoor24,200 BTU/h Power Supply 230V Single Phase 60Hz Heating Capacity Heating CapacityTH Total Heating Capacity BTU/h 29,000 BTU/h Room air temp F 26.7C Fan speed High Horizontal distance ft Air Throw Distance ChartsCooling Vertical distance ft Heating Vertical distance ftHeating CH1872 Voltage230V Cooling Electrical CharacteristicsElectrical Data Voltage208V CoolingCH2472 Voltage230V Cooling Electric Wiring Diagrams Indoor Unit KHS1872 KHS24728FA2-5257-70500-0 WHT WHT YEL YEL Maintenance Address Setting of the Remote Control UnitButton Operation HR.TIMER button ACL Reset button How to Disconnect How to ConnectEmergency operation FunctionsOperation Functions Auto cooling/heating operationTimer backup Lamp colorsOverload prevention during heating Compressor discharge temperature controlProtective Functions Freeze preventionDefrost detection and release CT Peak current cut-off controlReverse-Cycle Defrosting Troubleshooting Precautions before Performing Inspection or RepairMethod of Self-Diagnostics Self-diagnostics Lamps Normal Replace the controllerReplace the circuit board or the fuse Using the TEST/T-RUN terminals Checking the Indoor and Outdoor UnitsChecking the indoor unit Control Check items unit operation Before the Operation Serial Communication Error Identification ProcedureOff Blinking Illuminated Condition E01Terminal board Outdoor Unit Condition E12 Trouble Diagnosis of Fan Motor Indoor Fan MotorOutdoor Fan Motor Electromagnetic interference Noise Malfunction and Electromagnetic InterferenceNoise malfunction Locations most susceptible to noise Trouble CorrectionMeasurement of Insulation Resistance Power Supply CordChecking Electrical Components Measurement of Insulation Resistance for Electrical PartsChecking Continuity of Fuse on PCB Assy What is New Refrigerant R410A? Refrigerant R410A Special Precautions When Servicing UnitCharacteristics of New Refrigerant R410A CharacteristicsChecklist before Servicing Tubing Installation Procedures Tools Specifically for R410AProcedure for Replacing Compressor Case of Compressor MalfunctionDamage to the compressor Never charge a large amountUnit. This may cause ExampleCase Refrigerant is Leaking Welding leaking pointsRecharging Retro-Fitting Existing Systems When Tubes are ExtendedCharging Additional Refrigerant Use of Existing UnitsOI-852-6-4180-801-00-2 Features Contents Alert SymbolsProduct Information Installation Location Safety InstructionsElectrical Requirements Names of Parts Unit Display and Operation Button Quiet lampRemote Control Unit Display Advance button Remote Control UnitHR. Timer button TransmitterQuiet button FAN Speed selector buttonHow to Install Batteries Using the Remote Control UnitTemperature Display Selector Button Time Display Selector buttonUsing the Remote Control Unit Operation with the Remote Control Unit Press the ON/OFF operation buttonPress the TEMP. setting buttons to change the temperature Operation with the Remote Control UnitPress the Mode selector button and select the desired mode Set the FAN Speed selector button to the setting you wantAdjusting the Fan Speed Cooling and DRY Mode Night Setback Mode is used for saving energyQuiet Mode Special Remarks Setting the Timer Example To set to 1030 pmOperation Indication To cancel a timer program Press the Cancel button Setting the TimerHow to set the on time Example To start operation at 710 am 1030 pm 710 am 1100 am Present timeCancellation procedure Using the 1-Hour OFF TimerSetting procedure Operation together with the Daily ON/OFF Repeat TimerHorizontal Adjusting the Airflow DirectionSetting the airflow manually Sweep functionOperation without the Remote Control Unit Care and CleaningWhen the air conditioner is not running Grasp both ends of the air Care and CleaningCleaning Intake grilleFollow the steps below when the generator has become dirty Negative ion generator metal electrodes inside plastic caseTrouble Possible Cause Remedy TroubleshootingOperating Range Max DB / 71 F WB Min DB / 57 F WBAppendix B Installation Instructions Installation Instructions ContentsPlease Read Before Starting General Tools Required for Installation not suppliedAccessories Supplied with Unit Table Optional Copper Tubing KitInstallation Site Selection Additional Materials Required for InstallationSolid base must not cover the hole of the bottom plate Remove the Rear Panel from the Unit How to Install the Indoor UnitTrical wiring or conduits are Make a HoleInstall the Rear Panel on the Wall If Wooden WallIf Block, Brick, Concrete or Similar Type Wall Remove the Grille to Install the Indoor Unit How to remove the grilleHow to replace the grille Wiring Instructions General precautions on wiring Shape the Indoor Side TubingRecommended Wire Length and Diameter AWGWiring Instructions for Inter-unit Connections How to connect wiring to the terminal For Indoor Unit For Outdoor Unit For solid core wiring or F-cableFor stranded wiring Mounting Right-side tubingSwitching drain hose and drain cap Left-side tubingDrain cap To unmount indoor unit Do not supply power toTubing and wiring to the out Unit or operate it until allHow to Install the Outdoor Unit First refer to . Installation Site SelectionWiring Instructions for the Outdoor Unit Refrigerant Tubing Flaring Procedure with a Flare ToolTo 0.5 mm Adjust so that the amount of tube Use of the Flaring MethodInsulation of Refrigerant Tubing Connecting Tubing between Indoor and Outdoor UnitsFinishing the Installation To prevent heat loss and wet floors due to dripping of conAir Purging Be sure to completely insert Hex wrench beforeAttempting to turn the valve How to Test Run the Air Conditioner Stem, use the accessory Basic Functions of the Service ValvesWhen opening or clos Ing the service valve Pump DownRemote Control Unit Installation Position Mounting on a WallAddress Switch Address Setting of the Remote Control Unit
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