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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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Low oil detection. Detected at outdoor. Likely causes: TK1, TK2 & TK3 sensor condition - sensor value 20°C=63k Ohms Interface PCB faulty Refrigerant shortage

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

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

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

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

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

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

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

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

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

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

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

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

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

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