10. TROUBLESHOOTING
Contents
1. Blinking 3 Illuminated Operation a Diagnostics item Diagnostics contents Room temperature sensor failure 1 Sensor open circuit or short circuit 2 Contact failure at connector or open circuit at terminal crimping location short circuit Indoor heat exchanger sensor failure detection only for the humidity sensor Humidity sensor failure e Compressor temperature sensor failure e SH Suction sensor failure Outdoor heat exchanger sensor fai Outdoor air temperature sensor fail Electrical current detection failure 1 Operating frequency is 45 Hz or higher and less than 0 5 A of current is flowing Indoor outdoor communications fai 1 Miswiring 2 AC power failure 3 Blown fuse 4 Power relay failure serial communications Indoor or outdoor circuit board failure HIC or power Tr failure 2 Outdoor fan does not turn 3 Instantaneous power outage HIC circuit failure Service valve not opened 5 Outdoor fan blocked 6 Continuous overload operation Compressor failure 8 Outdoor circuit board failure Outdoor unit external ROM failure External ROM data failure 2 External ROM installation failure Peak current cut off Operating current is 20 A or higher PAM circuit failure PAM circuit abnormal voltage 2 Protection for current Compressor discharge overheat prevention activated Electric expansion valve failure 2 Capillaries choked 8 Shortage of refrigerant Indoor fan o2. below to perform diagnostics ON OFF operation button PROCEDURE 1 Turn the power supply switch ON However the A C itself should remain stopped 2 Press and hold the TEST RUN button on the main unit controller until the buzzer sounds 1 time At this time releasing the TEST RUN button starts self diagnostics 3 If there is a sensor failure or a protective function has activated self diagnostics lamps 1 2 and 3 will illuminate in the following pattern 5 seconds blinking illuminated 2 seconds OFF Buzzer sounds once while lamps are OFF Aleli If there is no trouble then self diagnostics lamps 1 2 and 3 do not illuminate and the buzzer does not sound 4 Diagnostics is completed when the buzzer sounds 3 times lt IMPORTANT gt After repairs are carried out be sure to press and hold the TEST RUN button until the buzzer sounds 2 times When the TEST RUN button is released the buzzer sounds 1 long beep and the diagnosis results are erased 43 1 Self diagnostics Lamps ae p LED CLEAN ION TIMER OPR i 3 2 1 ION TIMER OPERATION lamp lamp lamp If there is no trouble the lamps neither blink nor illuminate e Since the indications cover various units the corresponding parts listed below may not be present in some models Indication on indoor unit X OFF J
3. 10 TROUBLESHOOTING 10 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 310 V 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 After repairs are carried out be sure to press and hold the TEST RUN button until the buzzer sounds 2 times to erase the diagnosis results Main unit controller 10 2 Method of Self Diagnostics If the indoor unit operation lamp is blinking every 0 5 seconds follow the procedure below to perform detailed trouble diagnostics TEST RUN button 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 ROM socket insertion problem or the ROM has not been installed Make sure the ROM is in existence 2 The failure mode is stored in memory even when the power is not ON Follow the procedure
4. perating failure Locked fan motor 2 Contact failure at connector Indoor zero cross failure Noise instantaneous power blackout or power waveform error due to lightning or other factor 4 way valve failure heat pump model only 4 way valve switching failure i Way VaVe swicmngnars Indoor heat exchanger temperature sensor disconnected No refrigerant protection Service valve not opened 2 Shortage of refrigerant DC compressor drive circuit failure Open phase 2 Outdoor circuit board failure Outdoor fan operating failure Contact failure at connector 2 Outdoor circuit board failure Fue Fee EOE Fee EY EY X PX EP EX set BEL x X et St gt lt SE Faw OE Hee OE OEY OX YEP EP XE et OX EP OX REP OX Set A X x 5 5A ie 5 x x X oO 58 a 7 7 7 9 0 Outdoor system communications failure Miswiring in inter unit 2 Outdoor circuit board failure ot 16 w Freeze prevention operation activated Indoor fan system failure 2 Shortage of refrigerant 3 Low temperature operation If the operation lamp orange continues to blink immediately after when the power source has been supplied to the air conditioner there might be trouble with the external ROM E14 in the indoor unit 44
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