Question 1

04

Accepted Answer

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.

Question 2

08

Accepted Answer

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.

Question 3

09

Accepted Answer

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

Question 4

11

Accepted Answer

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

Question 5

12

Accepted Answer

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

Question 6

14

Accepted Answer

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.

Question 7

15

Accepted Answer

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

Question 8

17

Accepted Answer

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

Question 9

18

Accepted Answer

Condenser coil sensor (TE) fault.
 
Detected indoors.
 
Likely causes:
 
 TE/TE1 sensor condition / fault - sensor value 20°C=12.5k Ohms.
 Outdoor PCB fault.

Question 10

19

Accepted Answer

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.

Question 11

20

Accepted Answer

Condenser PCB faulty (Replace main PCB)

Question 12

21

Accepted Answer

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)

Question 13

22

Accepted Answer

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

Question 14

80

Accepted Answer

Multi-Controller box Th(A) sensor fault.
 
Likely causes:
 TH(A) sensor or M/C box PCB sensor value 20°C=12.5k Ohms

Question 15

81

Accepted Answer

Multi-Controller box Th(B) sensor fault.
 
Likely causes:
 TH(B) sensor or M/C box PCB sensor value 20°C=12.5k Ohms

Question 16

82

Accepted Answer

Multi-Controller box Th(C) sensor fault.
 
Likely causes:
 TH(C) sensor or M/C box PCB sensor value 20°C=12.5k Ohms

Question 17

83

Accepted Answer

Multi-Controller box Th(D) sensor fault.
 
Likely causes:
 TH(D) sensor or M/C box PCB sensor value 20°C=12.5k Ohms

Question 18

84

Accepted Answer

Multi-Controller box Th(X) sensor fault.
 
Likely causes:
 TH(X) sensor or M/C box PCB sensor value 20°C=12.5k Ohms

Question 19

87

Accepted Answer

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

Question 20

88

Accepted Answer

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

Question 21

89

Accepted Answer

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

Question 22

93

Accepted Answer

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

Question 23

94

Accepted Answer

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

Question 24

95

Accepted Answer

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

Question 25

96

Accepted Answer

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

Question 26

97

Accepted Answer

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

Question 27

98

Accepted Answer

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

Question 28

99

Accepted Answer

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

Question 29

0b

Accepted Answer

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.

Question 30

0c

Accepted Answer

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

Question 31

0d

Accepted Answer

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

Question 32

1C

Accepted Answer

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

Question 33

1d

Accepted Answer

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

Question 34

1E

Accepted Answer

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

Question 35

1F

Accepted Answer

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

Question 36

8d

Accepted Answer

Outdoor unit quantity fallen (loss of communication between condensers).
 
Detected at outdoor.
 
Likely causes:
 Power interruption
 BUS communication
Cable / wiring problem between condening units

Question 37

8E

Accepted Answer

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

Question 38

8F

Accepted Answer

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

Question 39

9A

Accepted Answer

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

Question 40

9F

Accepted Answer

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

Question 41

A0

Accepted Answer

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

Question 42

A1

Accepted Answer

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

Question 43

A2

Accepted Answer

Compressor suction sensor fault.
 
Detected at outdoor.
 
Likely causes:
 TS1/ThS sensor condition - sensor value 20°C=12.5k Ohms
 Interface PCB faulty

Question 44

A6

Accepted Answer

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

Question 45

A7

Accepted Answer

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

Question 46

AA

Accepted Answer

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

Question 47

Ab

Accepted Answer

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

Question 48

AE

Accepted Answer

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

Question 49

AF

Accepted Answer

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

Question 50

b4

Accepted Answer

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

Question 51

b5

Accepted Answer

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

Question 52

b6

Accepted Answer

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

Question 53

b7

Accepted Answer

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

Question 54

b9

Accepted Answer

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

Question 55

bb

Accepted Answer

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

Question 56

bE

Accepted Answer

Low pressure trip.
 
Detected outdoor by PS transducer.
 
Likely causes:
 Suction pressure transducer condition (PS)
 Interface PCB fault
 Restriction in refrigerant flow
 Refrigerant shortage

Question 57

C05

Accepted Answer

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

Question 58

C06

Accepted Answer

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

Question 59

d1

Accepted Answer

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

Question 60

d2

Accepted Answer

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

Question 61

d3

Accepted Answer

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

Question 62

d4

Accepted Answer

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

Question 63

d5

Accepted Answer

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

Question 64

d6

Accepted Answer

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

FAQ

Frequently asked questions

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08

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80

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0b

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1C

1d

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8d

8E

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A0

A1

A2

A6

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AA

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AE

AF

b4

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b9

bb

bE

C05

C06

d1

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dA

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dd

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