TOSHIBA FAULT CODES

Fault Finding When You Need It!

At Cool Solutions we believe that one of the companies strengths the the Technical Support that we offer.  We have created this web page to give engineers a simple tool for helping with fault finding.

 

Also, Click on the image to the right to download the latest Technical Handbook.

Toshiba Technical Handbook

Select A Fault Code Or Click On The Search Button

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.




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.




09


Frost conditions detected / No temperature change. Detected indoors by evaporator sensor (TC). Likely causes: Poor airflow. Refrigerant Shortage.
Overheating compressor.




11


Indoor fan trouble. Detected indoors. Likely causes: Fan motor. Indoor PCB. On a cassette, packing foam has not been removed.




12


EEPROM Failure on PCB. Detected indoors (replace indoor PCB)




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.




15


Multi-Controller box error. Detected indoors (Interrogate Multi-Controller box for additional faults by setting display switch @ position 1)




17


Abnormal current detection on inverter compressor. Detected at outdoor. Possible causes: IPDU PCB (Inverter board) faulty. Compressor faulty.




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.




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.




20


Condenser PCB faulty (Replace main PCB)




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)




22


Excessive high pressure. Detected at outdoor. Likely causes: Abnormal characteristics of Pd transducer. Refrigerant restriction/blockage




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




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




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




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




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




87


Phase missing / Phase Rotation. Detected at outdoor. Likely causes: Abnormal power supply.




88


Multi-Control box does not recognise condenser capacity. Likely causes: Interconnecting cable damage. Outdoor PCB fault.




89


Indoor capacity to high. Likely causes: Loss of combination within group of modularised condensers.




93


Indoor coil sensor fault. Detected indoors. Likely causes: TC1 sensor condition - sensor value 20°C=12.5k Ohms. Indoor PCB faulty.




94


Indoor coil sensor fault. Detected indoors. Likely causes: TC2 sensor condition - sensor value 20°C=12.5k Ohms. Indoor PCB faulty.




95


Communication failure on P&Q network (indoor/outdoor communication). Detected indoors & outdoors. Likely causes: Network cable condition. PCB failure, indoor or outdoor.




96


Indoor unit count too high. Detected at outdoor. Likely causes: Indoor capacity vs. outdoor capacity Incorrect. Too many indoor units connected.




97


Central control communication error. Detected at central controller & indoors. Likely causes: Indoor power failure. Central controller address error. Cable damage.




98


Duplicated zone address. Likely causes: Incorrectly assigned central control addresses.




99


No communication from indoor to remote controller. Detected by hard-wired remote controller. Likely causes: Faulty indoor PCB. Remote controller faulty.
Cable damage.




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.




0c


Return air sensor fault. Detected indoors. Likely causes: TA sensor condition - sensor value 20°C=12.5k Ohms. Indoor PCB faulty.




0d


Coil sensor fault. Detected indoors. Likely causes: TC sensor condition - Sensor value 20°c=12.5k Ohms Indoor PCB fault




1C


Outdoor error. Detected indoors (Interrogate condenser units for additional faults)




1d


High Inverter DC current. Detected at outdoor. Likely causes: Imbalance in compressor voltage Excessive amps drawn by inverter compressor




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




1F


High Inverter AC current. Detected at outdoor. Likely causes: Imbalance in compressor voltage draw Excessive amps drawn by inverter compressor




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




8E


Outdoor units quantity too high. Detected at outdoor. Likely cause: Too many condensers connected




8F


Outdoor unit address incorrect. Detected at outdoor. Likely causes: Multiple modularised condenser having SW 9 ON Interface PCB failure




9A


No temperature change in evaporator. Detected by indoor evaporator sensor TC1. Likely causes: Miss-wiring Restriction in refrigerant flow Refrigerant shortage




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




A0


Compressor discharge sensor fault. Detected at outdoor. Likely causes: TD1/ThD1 sensor condition - sensor value 20°C=63k Ohms Interface PCB faulty




A1


Compressor discharge sensor fault. Detected at outdoor. Likely causes: TD2/ThD2 sensor condition - sensor value 20°C=63k Ohms 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




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




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




AA


High side pressure sensor fault. Detected at outdoor. (Replace Pd pressure transducer)




Ab


Pressure transducer error. Detected at outdoor. Likely causes: Abnormal running pressures Abnormal PS / Pd characteristics Interface PCB faulty




AE


High compressor discharge temperature @ low inverter speed. Detected at outdoor. Likely causes: TD1 sensor condition - value 20°C=63k Ohms Insufficient refrigerant sensor




AF


Phase rotation incorrect. Detected at outdoor. Likely causes: Abnormal phase order Missing phase to outdoor unit




b4


Low pressure transducer error or misreading fault. Detected at outdoor. Likely causes: Incorrect characteristics of suction pressure transducer (PS)
Interface PCB faulty




b5


External input activation, refrigerant leak detection system (Call Toshiba's technical helpline for further details 0870 843 0333)




b6


External input activation, refrigerant leak detection system (Call Toshiba's technical helpline for further details 0870 843 0333)




b7


Indoor group follower error. Detected at central controller (interrogate local controller by pressing check for additional fault codes)




b9


Pressure sensor fault. Detected indoors. Likely causes: Evaporator pressure sensor unplugged Pressure sensor open circuit




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




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




C05


Command sending error. Detected on Central Controller. Likely causes: Power loss at indoor unit group Network cable condition




C06


Command receiving error. Detected on Central Controller. Likely causes: Power loss at indoor unit group Network cable condition




d1


Master condenser setup alarm. Detected at outdoor. Likely causes: Multiple inverter outdoor units connected Faulty interface PCB




d2


Fault within follower condenser. Detected at outdoor. (retrieve additional fault code information from follower condensers)




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




d4


Oil sensor fault. Detected at outdoor. Likely causes: TK1 sensor condition - sensor value 20°C=63k Ohms Outdoor PCB faulty




d5


Oil sensor fault. Detected at outdoor. Likely causes: TK2 sensor condition - sensor value 20°C=63k Ohms Outdoor PCB faulty




d6


Oil sensor fault. Detected at outdoor. Likely causes: TK3 sensor condition - sensor value 20°C=63k Ohms Outdoor 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




d8


Oil temperature alarm. Detected at outdoor. Likely causes: TK1 sensor location or condition - sensor value 20°C=63k Ohms Outdoor PCB faulty




d9


Oil temperature alarm. Detected at outdoor. Likely causes: TK2 sensor location or condition - sensor value 20°C=63k Ohms Outdoor PCB faulty




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




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




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




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




dE


Indoor unit automatic addressing failure. Detected at outdoor. Likely causes: Indoor PCB configuration error Indoor PCB faulty




dF


Outdoor unit automatic address failure. Detected at outdoor. Likely cause: Interface PCB faulty




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




E02


Sending error of local remote controller. Detected by remote controller. Likely causes: Faulty remote controller Cable / wiring problem




E03


Communication error between indoor unit and central remote controller. Detected indoors. Likely causes: Indoor network adapter fault Central remote controller fault




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




E06


Decrease in quantity of indoor units. Detected indoors. Likely causes: Power loss at indoor unit Indoor PCB faulty A&B controller wiring problem




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





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Cool Solutions Distribution Ltd

Units 9  & 10 Station Way

Leeds, West Yorkshire.  LS12 3HQ

Tel: 0113 2799520

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