Panasonic CU-KE18NKU Troubleshooting Before Calling for Service, Method of Self-Diagnostics

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9. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)

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 HIGH POWER 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 HIGH POWER 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.

HIGH POWER button

<Clock display > Test run mode

Self-diagnostics mode

ON/OFF operation button

1HR.

TIMER button

ACL

(Reset) button

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Contents 852 361 Outdoor Model No. Product Code NoSafety Precautions Prohibit Table of Contents CZ-RD515U CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1Operating Range Temperature Indoor Air Intake Temp Outdoor Air Intake TempCS-KE12NB41 & CZ-18BT1U SpecificationsUnit Specifications Indoor UnitDimensions & Weight Outdoor Unit Dimensions & Weight Indoor Unit230V CU-KE18NKUCU-KE18NKU 208V CZ-KE18NB4UW & CZ-18BT1U Indoor Unit Panel CZ-18BT1U Major Component SpecificationsIndoor Unit Indoor Unit Body CS-KE12NB41CB-CS-KE18NB4U Indoor Unit Body CS-KE18NB4UWExternal Finish Outdoor UnitOutdoor Unit CU-KE12NK1 CompressorOutdoor Unit CU-KE18NKU Outdoor air temp sensor Other Component SpecificationsIndoor Unit CS-KE12NB41 & CZ-18BT1U Indoor air temp sensor ModelKTEC-35-S98Unit inch mm Dimensional DataUnit inch mm 852-0-0010-12700-0 Unit inch mm 852-0-0010-13200-0 Refrigerant Flow Diagram Refrigerant Flow DiagramOutdoor unit Outdoor unit Temperature Charts Performance DataIndoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1 High pressure performance chart Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU At wide Pressure Power Supply 115V Single Phase 60Hz Cooling Capacity Cooling CapacityCU-KE12NK1 CS-KE18NB4UW & CZ-18BT1U Power Supply 230V Single Phase 60Hz Cooling CapacityCooling Capacity Low Ambient 740 11,860 800 24.4 Power Supply 115V Single Phase 60Hz Heating Capacity Heating CapacityTH Total Heating Capacity BTU/h Power Supply 230V Single Phase 60Hz Heating Capacity Heating Electrical CharacteristicsElectrical Data CoolingVoltage208V Cooling Voltage230V CoolingCS-KE12NB41 18BT1U8FA2-5250-46900-2 Outdoor Unit CU-KE12NK1 8FA2-5251-12200-2 Controller Address Setting of the Remote Controller MaintenanceHow to Connect How to DisconnectDisassembly Procedure Disconnect the connectors in the control boxRemove the air intake grill Remove the ceiling panel Remove the power box and control box Remove the indoor air temperature sensorScrew Ground cable CN07 CN03 CN09 CN06 Remove the main body lower section Remove the heat exchanger sensor Remove the drain pump and float switchRemove the heat exchanger Remove the turbo fan and fan motorAuto cooling/heating operation FunctionsOperation Functions Emergency operationLamp colors Timer backupFreeze prevention Compressor discharge temperature controlProtective Functions Overload prevention during heatingDefrost detection and release CT Peak current cut-off controlReverse-Cycle Defrosting Troubleshooting Before Calling for Service Precautions before Performing Inspection or RepairMethod of Self-Diagnostics Indoor Unit Self-diagnostics LampsReplace the circuit board or the fuse Using the TEST/T-RUN terminalsChecking the Indoor and Outdoor Units Replace the controllerCondition E01 Serial Communication Error Identification ProcedureOff Blinking Illuminated Before the OperationFrom the previous page a Condition E12 Indoor Fan Motor Trouble Diagnosis of Fan MotorOutdoor Fan Motor Locations most susceptible to noise Trouble Correction Noise Malfunction and Electromagnetic InterferenceNoise malfunction Electromagnetic interferenceMeasurement of Insulation Resistance for Electrical Parts Power Supply CordChecking Electrical Components Measurement of Insulation ResistanceChecking Continuity of Fuse on PCB Assy Characteristics Refrigerant R410A Special Precautions When Servicing UnitCharacteristics of New Refrigerant R410A What is New Refrigerant R410A?Checklist before Servicing Tools Specifically for R410A Tubing Installation ProceduresCase of Compressor Malfunction Procedure for Replacing CompressorTo prevent the composition Configuration and characteristics of cylindersAmount in the charging cylinder is less than 20% ExampleCase Refrigerant is Leaking Welding leaking pointsRecharging Use of Existing Units When Tubes are ExtendedCharging Additional Refrigerant Retro-Fitting Existing Systems
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CZ-18BT1U, CS-KE12NB41, CS-KE18NB4UW, CU-KE18NKU, CU-KE12NK1 specifications

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