Service manual

63
14
Troubleshooting
Self Diagnostic Function
Over capacity
Abnormal phase connection
Indoor drain overflow alarm
STANDBY
display
Liquid crystal remote controller CHECK code
Outdoor Unit Interface segment CHECK code
Remote
Controller
Indoor
Unit
Outdoor
Unit
Remote controller serial signal circuit “99”
Indoor sensor (TA) short or open circuit “0C”
Indoor heat exchanger sensor (TC1) short circuit “93”
Indoor heat exchanger sensor (TC2) short circuit “94”
Indoor pressure sensor short circuit “b9”
Motor short circuit “11”
Drain pump fault “0b”
Refrigerant circulation amount shortage judgement“9F”
Indoor/outdoor communication short circuit “95”
Central management communication short circuit “97”
Central management address setup fault “98”
External input display fault “b5”
(Low level refrigerant leak if RBC-RD1-PE fitted)
External interlock display fault “b6”
(High level refrigerant leak if RBC-RD1-PE fitted)
Indoor Unit miswiring/misconnection “9A”
Indoor P.C. board short circuit “12”
Inverter serial signal short circuit “04” –
(High level refrigerant leak if RBC-RD2-PE fitted)
Four-way valve alarm “08” –
Outdoor heat exchanger sensor (TE1) short circuit “18” “18”
Discharge temp. sensor (TD1) short circuit “A0” “A0”
Discharge temp. sensor (TD2) short circuit “A1” “A1”
Suction temp. sensor (TS) short circuit “A2” “A2”
High pressure sensor (Pd) short circuit “AA” “AA”
Low pressure sensor (Ps) short circuit “b4” “b4”
Pressure sensor (Pd/Ps) miswiring “Ab” “Ab”
Discharge temp. (TD1) protective operation “A6” “A6”
Discharge temp. (TD2) protective operation “bb” “bb”
Low Hz time discharge temp. (TD1) protective operation “AE” “AE”
Suction temp. (TS) protective operation “A7” “A7”
High pressure (Pd) protective operation “22” “22”
Low pressure (Ps) protective operation “bE” “bE”
Fixed-speed 1 high pressure SW short circuit “E1” “E1”
Fixed-speed 2 high pressure SW short circuit “F0” “F0”
Fixed-speed 1 IOL, OCR short circuits “E6” “E6”
Fixed-speed 2 IOL, OCR short circuits “F1” “F1”
Inverter IOL short circuit “E5” –
Mg-SW deposit controlling display “bd” “bd”
Outdoor Unit power source phase order miswiring “AF” “AF”
Extension IC, EEPROM short circuit “1C” “1C”
Indoor/Outdoor error “Eb” –
Indoor/Outdoor communication short circuit “95” –
No. of connected indoor units over capacity “96” –
Connected indoor units over capacity “89” –
Outdoor unit back-up operation prevented “8c” –
Reduction of No. of server outdoor units “8d” –
No. of server outdoor units over capacity “8E” –
Server outdoor address incorrect “8F” –
Outdoor master unit incorrect “d1” “d1”
Server outdoor unit error “d2” –
Oil temp. (TK1) sensor short circuit “d4” “d4”
Oil temp. (TK2) sensor short circuit “d5” “d5”
Oil temp. (TK3) sensor short circuit “d6” “d6”
Oil level low detection “d7” “d7”
Oil temp. (TK1) detection error “d8” “d8”
Oil temp. (TK2) detection error “d9” “d9”
SV3C valve blockage detection “db” “db”
SV3C valve leakage detection “dC” “dC”
PMV refrigerant leakage detection “dd” “dd”
Indoor address undefined* “dE” –
Outdoor address undefined* “dF” –
Missing of R phase “87” “87”
High pressure SW circuit “21”
G-Tr short-circuit protective operation “14”
Current detection circuit “17”
Compressor error “1d”
Compressor breakdown “1F”
TH sensor circuit “d3”
Heat sink overheat protective operation “dA”
Remote Controller
Outdoor IPDU
Inverter outdoor unit
Fixed
Speed
outdoor
unit
Indoor Unit
*: No display on the remote controller
Note: To retrieve fault codes, ensure rotary switches 1, 2 and 3 on the Outdoor Interface
PCB (MCC-1343-01) are all set to 1 (factory default setting).
Individual Indoor Fault Codes can be retrieved by referring to page 49.