TOSHIBA FAULT CODES
Fault Finding When You Need It!
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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.
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.
Frost conditions detected / No temperature change.
Detected indoors by evaporator sensor (TC).
Likely causes:
Poor airflow.
Refrigerant Shortage. Overheating compressor.
Indoor fan trouble. Detected indoors.
Likely causes:
Fan motor.
Indoor PCB.
On a cassette, packing foam has not been removed.
EEPROM Failure on PCB.
Detected indoors (replace indoor PCB)
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.
Multi-Controller box error.
Detected indoors (Interrogate Multi-Controller box for additional faults by setting display switch @ position 1)
Abnormal current detection on inverter compressor.
Detected at outdoor.
Possible causes:
IPDU PCB (Inverter board) faulty.
Compressor faulty.
Condenser coil sensor (TE) fault.
Detected indoors.
Likely causes:
TE/TE1 sensor condition / fault - sensor value 20°C=12.5k Ohms.
Outdoor PCB fault.
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.
Condenser PCB faulty (Replace main PCB)
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)
Excessive high pressure.
Detected at outdoor.
Likely causes:
Abnormal characteristics of Pd transducer.
Refrigerant restriction/blockage
Multi-Controller box Th(A) sensor fault.
Likely causes:
TH(A) sensor or M/C box PCB sensor value 20°C=12.5k Ohms
Multi-Controller box Th(B) sensor fault.
Likely causes:
TH(B) sensor or M/C box PCB sensor value 20°C=12.5k Ohms
Multi-Controller box Th(C) sensor fault.
Likely causes:
TH(C) sensor or M/C box PCB sensor value 20°C=12.5k Ohms
Multi-Controller box Th(D) sensor fault.
Likely causes:
TH(D) sensor or M/C box PCB sensor value 20°C=12.5k Ohms
Multi-Controller box Th(X) sensor fault.
Likely causes:
TH(X) sensor or M/C box PCB sensor value 20°C=12.5k Ohms
Phase missing / Phase Rotation.
Detected at outdoor.
Likely causes:
Abnormal power supply.
Multi-Control box does not recognise condenser capacity.
Likely causes:
Interconnecting cable damage.
Outdoor PCB fault.
Indoor capacity to high.
Likely causes:
Loss of combination within group of modularised condensers.
Indoor coil sensor fault.
Detected indoors.
Likely causes:
TC1 sensor condition - sensor value 20°C=12.5k Ohms.
Indoor PCB faulty.
Indoor coil sensor fault.
Detected indoors.
Likely causes:
TC2 sensor condition - sensor value 20°C=12.5k Ohms.
Indoor PCB faulty.
Communication failure on P&Q network (indoor/outdoor communication).
Detected indoors & outdoors.
Likely causes:
Network cable condition.
PCB failure, indoor or outdoor.
Indoor unit count too high.
Detected at outdoor.
Likely causes:
Indoor capacity vs. outdoor capacity Incorrect.
Too many indoor units connected.
Central control communication error.
Detected at central controller & indoors.
Likely causes:
Indoor power failure.
Central controller address error.
Cable damage.
Duplicated zone address.
Likely causes:
Incorrectly assigned central control addresses.
No communication from indoor to remote controller.
Detected by hard-wired remote controller.
Likely causes:
Faulty indoor PCB.
Remote controller faulty. Cable damage.
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.
Return air sensor fault.
Detected indoors.
Likely causes:
TA sensor condition - sensor value 20°C=12.5k Ohms.
Indoor PCB faulty.
Coil sensor fault.
Detected indoors.
Likely causes:
TC sensor condition - Sensor value 20°c=12.5k Ohms
Indoor PCB fault
Outdoor error.
Detected indoors (Interrogate condenser units for additional faults)
High Inverter DC current.
Detected at outdoor.
Likely causes:
Imbalance in compressor voltage
Excessive amps drawn by inverter compressor
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
High Inverter AC current.
Detected at outdoor.
Likely causes:
Imbalance in compressor voltage draw
Excessive amps drawn by inverter compressor
Outdoor unit quantity fallen (loss of communication between condensers).
Detected at outdoor.
Likely causes:
Power interruption
BUS communication Cable / wiring problem between condening units
Outdoor units quantity too high.
Detected at outdoor.
Likely cause:
Too many condensers connected
Outdoor unit address incorrect.
Detected at outdoor.
Likely causes:
Multiple modularised condenser having SW 9 ON
Interface PCB failure
No temperature change in evaporator.
Detected by indoor evaporator sensor TC1.
Likely causes:
Miss-wiring
Restriction in refrigerant flow
Refrigerant shortage
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
Compressor discharge sensor fault.
Detected at outdoor.
Likely causes:
TD1/ThD1 sensor condition - sensor value 20°C=63k Ohms
Interface PCB faulty
Compressor discharge sensor fault.
Detected at outdoor.
Likely causes:
TD2/ThD2 sensor condition - sensor value 20°C=63k Ohms
Interface PCB faulty
Compressor suction sensor fault.
Detected at outdoor.
Likely causes:
TS1/ThS sensor condition - sensor value 20°C=12.5k Ohms
Interface PCB faulty
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
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
High side pressure sensor fault.
Detected at outdoor. (Replace Pd pressure transducer)
Pressure transducer error.
Detected at outdoor.
Likely causes:
Abnormal running pressures
Abnormal PS / Pd characteristics
Interface PCB faulty
High compressor discharge temperature @ low inverter speed.
Detected at outdoor.
Likely causes:
TD1 sensor condition - value 20°C=63k Ohms
Insufficient refrigerant sensor
Phase rotation incorrect.
Detected at outdoor.
Likely causes:
Abnormal phase order
Missing phase to outdoor unit
Low pressure transducer error or misreading fault.
Detected at outdoor.
Likely causes:
Incorrect characteristics of suction pressure transducer (PS) Interface PCB faulty