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
