top of page

FAQ

  • dd
    Temperature change when condensers in off cycle. Detected at outdoor. Likely causes: PMV passing within condenser Discharge & suction pressure transducer error (PS & Pd characteristics) Interface PCB faulty
  • E02
    Sending error of local remote controller. Detected by remote controller. Likely causes: Faulty remote controller Cable / wiring problem
  • AA
    High side pressure sensor fault. Detected at outdoor. (Replace Pd pressure transducer)
  • 08
    This points towards a reverse change in temperature, detected by indoor evaporator sensor (TC). Likely causes: 4 way valve. 4 way reversing valve energised for heating operation. Faulty TC sensor.
  • b4
    Low pressure transducer error or misreading fault. Detected at outdoor. Likely causes: Incorrect characteristics of suction pressure transducer (PS) Interface PCB faulty
  • d5
    Oil sensor fault. Detected at outdoor. Likely causes: TK2 sensor condition - sensor value 20°C=63k Ohms Outdoor PCB faulty
  • C06
    Command receiving error. Detected on Central Controller. Likely causes: Power loss at indoor unit group Network cable condition
  • 18
    Condenser coil sensor (TE) fault. Detected indoors. Likely causes: TE/TE1 sensor condition / fault - sensor value 20°C=12.5k Ohms. Outdoor PCB fault.
  • E03
    Communication error between indoor unit and central remote controller. Detected indoors. Likely causes: Indoor network adapter fault Central remote controller fault
  • dC
    High temperature oil alarm. Detected at outdoor. Likely causes: TK1 sensor condition - sensor value 20°C=63k Ohms Interface PCB faulty High ambient running conditions >43°c
  • 8F
    Outdoor unit address incorrect. Detected at outdoor. Likely causes: Multiple modularised condenser having SW 9 ON Interface PCB failure
  • b6
    External input activation, refrigerant leak detection system (Call Toshiba's technical helpline for further details 0870 843 0333)
  • dE
    Indoor unit automatic addressing failure. Detected at outdoor. Likely causes: Indoor PCB configuration error Indoor PCB faulty
  • AF
    Phase rotation incorrect. Detected at outdoor. Likely causes: Abnormal phase order Missing phase to outdoor unit
  • A6
    High compressor discharge temperature. Detected at outdoor by TD1. Likely causes: Low refrigerant Poor refrigerant flow Airflows TD2 sensor faulty - sensor value 20°C=63k Ohms
  • 21
    2 Pipe VRF & Split A/C equipment High Pressure switch activation 425psi-29bar. 3 Pipe VRF equipment, interrogate condenser PCB for additional fault code. Detected at outdoor. Likely causes: Split A/C equipment faulty H.P. switch, restriction in refrigerant flow, fan motor failure, poor airflows. VRF equipment, set condenser interface PCB switches as follows SW1 @ position 2 & SW2 @ position 0 (see sub codes Er21 or ErAd)
  • dF
    Outdoor unit automatic address failure. Detected at outdoor. Likely cause: Interface PCB faulty
  • A2
    Compressor suction sensor fault. Detected at outdoor. Likely causes: TS1/ThS sensor condition - sensor value 20°C=12.5k Ohms Interface PCB faulty
  • 04
    On split A/C equipment it signifies an indoor to outdoor communication failure. On VRF equipment it could also be attributed to communication breakdown between condenser PCB's. Likely causes: - Indoor PCB. - Condenser PCB. - Interconnecting Wiring. - Fault with the transformer used to power condenser PCB.
  • b7
    Indoor group follower error. Detected at central controller (interrogate local controller by pressing check for additional fault codes)
  • d1
    Master condenser setup alarm. Detected at outdoor. Likely causes: Multiple inverter outdoor units connected Faulty interface PCB
  • bb
    High compressor discharge temperature. Detected at outdoor by TD2. Likely causes: Refrigerant shortage Poor refrigerant flow Poor airflows TD2 sensor condition - sensor value 20°C=63k Ohms
  • d8
    Oil temperature alarm. Detected at outdoor. Likely causes: TK1 sensor location or condition - sensor value 20°C=63k Ohms Outdoor PCB faulty
  • 0c
    Return air sensor fault. Detected indoors. Likely causes: TA sensor condition - sensor value 20°C=12.5k Ohms. Indoor PCB faulty.
  • db
    No oil flow detected. Detected at outdoor. Likely causes: TK1, TK2 & TK3 sensor location or condition - sensor value 20°C=63k Ohms Interface PCB faulty Blockage within SV3C
  • 8d
    Outdoor unit quantity fallen (loss of communication between condensers). Detected at outdoor. Likely causes: Power interruption BUS communication Cable / wiring problem between condening units
  • d9
    Oil temperature alarm. Detected at outdoor. Likely causes: TK2 sensor location or condition - sensor value 20°C=63k Ohms Outdoor PCB faulty
  • Ab
    Pressure transducer error. Detected at outdoor. Likely causes: Abnormal running pressures Abnormal PS / Pd characteristics Interface PCB faulty
  • d7
    Low oil detection. Detected at outdoor. Likely causes: TK1, TK2 & TK3 sensor condition - sensor value 20°C=63k Ohms Interface PCB faulty Refrigerant shortage
  • E04
    Communication failure between indoor and outdoor units. Detected indoors. Likely causes: Split A/C Indoor PCB fault Outdoor PCB fault Interconnecting cable condition Compressor klixon open circuit. VRF system Power loss at condenser U1/U2 network cable issue
  • A0
    Compressor discharge sensor fault. Detected at outdoor. Likely causes: TD1/ThD1 sensor condition - sensor value 20°C=63k Ohms Interface PCB faulty
  • 98
    Duplicated zone address. Likely causes: Incorrectly assigned central control addresses.
  • E01
    Communication error between indoor unit and remote controller. Detected by remote controller. Likely causes: Indoor PCB faulty Remote controller faulty Incorrect switch position on rear of remote controller, all switches normally down Cable / wiring problem
  • 19
    Liquid or Compressor discharge sensor fault. Likely causes TL,TD sensor condition / faulty - TL sensor value 20°C=12.5k Ohms, TD sensor value 20°C=63k Ohms PCB faulty.
  • d4
    Oil sensor fault. Detected at outdoor. Likely causes: TK1 sensor condition - sensor value 20°C=63k Ohms Outdoor PCB faulty
  • 1C
    Outdoor error. Detected indoors (Interrogate condenser units for additional faults)
  • dA
    Abnormal overheat of heat-sink. Detected at outdoor. Likely causes: Clogged heat-sink fins Poorly secured PCB (Has heat sink paste been used) Faulty IPDU board
  • 81
    Multi-Controller box Th(B) sensor fault. Likely causes: TH(B) sensor or M/C box PCB sensor value 20°C=12.5k Ohms
  • b9
    Pressure sensor fault. Detected indoors. Likely causes: Evaporator pressure sensor unplugged Pressure sensor open circuit
  • 93
    Indoor coil sensor fault. Detected indoors. Likely causes: TC1 sensor condition - sensor value 20°C=12.5k Ohms. Indoor PCB faulty.
  • 99
    No communication from indoor to remote controller. Detected by hard-wired remote controller. Likely causes: Faulty indoor PCB. Remote controller faulty. Cable damage.
  • bE
    Low pressure trip. Detected outdoor by PS transducer. Likely causes: Suction pressure transducer condition (PS) Interface PCB fault Restriction in refrigerant flow Refrigerant shortage
  • d3
    IPDU PCB overheat (Inverter board). Detected at outdoor. Likely causes: Clogged heat-sink fins Poorly secured PCB (Has heat sink paste been used) Faulty IPDU PCB
  • AE
    High compressor discharge temperature @ low inverter speed. Detected at outdoor. Likely causes: TD1 sensor condition - value 20°C=63k Ohms Insufficient refrigerant sensor
  • 09
    Frost conditions detected / No temperature change. Detected indoors by evaporator sensor (TC). Likely causes: Poor airflow. Refrigerant Shortage. Overheating compressor.
  • b5
    External input activation, refrigerant leak detection system (Call Toshiba's technical helpline for further details 0870 843 0333)
  • 88
    Multi-Control box does not recognise condenser capacity. Likely causes: Interconnecting cable damage. Outdoor PCB fault.
  • 83
    Multi-Controller box Th(D) sensor fault. Likely causes: TH(D) sensor or M/C box PCB sensor value 20°C=12.5k Ohms
  • 95
    Communication failure on P&Q network (indoor/outdoor communication). Detected indoors & outdoors. Likely causes: Network cable condition. PCB failure, indoor or outdoor.
  • 14
    Inverter compressor PCB short circuit. Detected at outdoor. Likely causes: Blown fuses supplying inverter pack. Faulty IPDU (inverter board) or component within inverter pack. Electrical fault on inverter compressor.
  • 97
    Central control communication error. Detected at central controller & indoors. Likely causes: Indoor power failure. Central controller address error. Cable damage.
  • 84
    Multi-Controller box Th(X) sensor fault. Likely causes: TH(X) sensor or M/C box PCB sensor value 20°C=12.5k Ohms
  • 15
    Multi-Controller box error. Detected indoors (Interrogate Multi-Controller box for additional faults by setting display switch @ position 1)
  • 8E
    Outdoor units quantity too high. Detected at outdoor. Likely cause: Too many condensers connected
  • 87
    Phase missing / Phase Rotation. Detected at outdoor. Likely causes: Abnormal power supply.
  • 80
    Multi-Controller box Th(A) sensor fault. Likely causes: TH(A) sensor or M/C box PCB sensor value 20°C=12.5k Ohms
  • 82
    Multi-Controller box Th(C) sensor fault. Likely causes: TH(C) sensor or M/C box PCB sensor value 20°C=12.5k Ohms
  • 9A
    No temperature change in evaporator. Detected by indoor evaporator sensor TC1. Likely causes: Miss-wiring Restriction in refrigerant flow Refrigerant shortage
  • 0b
    Indoor float switch open circuit as result of high condensation levels within drip tray. Detected indoors. Likely causes: Faulty float switch. Faulty lift pump. Drain blocked.
  • 12
    EEPROM Failure on PCB. Detected indoors (replace indoor PCB)
  • 1E
    High compressor discharge temperature. Detected at outdoor. Likely causes: Low refrigerant charge Poor refrigerant flow, blockage Poor airflows TD sensor condition - sensor value 20°C=63k Ohms
  • 11
    Indoor fan trouble. Detected indoors. Likely causes: Fan motor. Indoor PCB. On a cassette, packing foam has not been removed.
  • d2
    Fault within follower condenser. Detected at outdoor. (retrieve additional fault code information from follower condensers)
  • C05
    Command sending error. Detected on Central Controller. Likely causes: Power loss at indoor unit group Network cable condition
  • 1F
    High Inverter AC current. Detected at outdoor. Likely causes: Imbalance in compressor voltage draw Excessive amps drawn by inverter compressor
  • E07
    Communication failure between indoor and outdoor units. Detected at outdoor. Likely causes Interconnecting cable problem Outdoor PCB switch position SW30 bit 1 & 2 must be placed in ON position for test
  • 1d
    High Inverter DC current. Detected at outdoor. Likely causes: Imbalance in compressor voltage Excessive amps drawn by inverter compressor
  • 22
    Excessive high pressure. Detected at outdoor. Likely causes: Abnormal characteristics of Pd transducer. Refrigerant restriction/blockage
  • 20
    Condenser PCB faulty (Replace main PCB)
  • 9F
    Insufficient temperature change on evaporator. Detected indoors. Likely causes: Miss-wiring Restriction in refrigerant flow Refrigerant shortage TC1,TC2 & TA sensor condition - sensor value 20°C=12.5k Ohms
  • E06
    Decrease in quantity of indoor units. Detected indoors. Likely causes: Power loss at indoor unit Indoor PCB faulty A&B controller wiring problem
  • 17
    Abnormal current detection on inverter compressor. Detected at outdoor. Possible causes: IPDU PCB (Inverter board) faulty. Compressor faulty.
  • A1
    Compressor discharge sensor fault. Detected at outdoor. Likely causes: TD2/ThD2 sensor condition - sensor value 20°C=63k Ohms Interface PCB faulty
  • A7
    High compressor suction temperature > 40°C. Detected at outdoor. Likely causes: Severe gas shortage TS sensor condition - sensor value 20°C=12.5k Ohms Interface PCB faulty
  • 96
    Indoor unit count too high. Detected at outdoor. Likely causes: Indoor capacity vs. outdoor capacity Incorrect. Too many indoor units connected.
  • 89
    Indoor capacity to high. Likely causes: Loss of combination within group of modularised condensers.
  • 0d
    Coil sensor fault. Detected indoors. Likely causes: TC sensor condition - Sensor value 20°c=12.5k Ohms Indoor PCB fault
  • 94
    Indoor coil sensor fault. Detected indoors. Likely causes: TC2 sensor condition - sensor value 20°C=12.5k Ohms. Indoor PCB faulty.
  • d6
    Oil sensor fault. Detected at outdoor. Likely causes: TK3 sensor condition - sensor value 20°C=63k Ohms Outdoor PCB faulty
bottom of page