Service manual

Troubleshooting

Diagnostic Procedure for Check Code

Check code Operation cause

[d2]

Defective slave outdoor unit

Slave outdoor unit alarm

An error occurs in the slave outdoor unit. Confirm the check code of the slave unit, and

check it according to the diagnostic procedure for each check code.

Check code Operation cause

[d3] Error of temp. sensor incorporated in IGBT

TH sensor alarm (Inverter Gate Bi-Polar Transistor)

There is an error with the temp. sensor incorporated in IGBT. Check connectors CN07 on

IPDU P.C. board and CN600 on interface P.C. board. If there is no problem,

replace IPDU P.C. board.

Check code Operation cause

[d4]

TK1 sensor open/short

TK1 sensor alarm

Open/short of TK1 was detected. Check connection (TK1 sensor: CN516) and resistance

value characteristics of the sensor.

If sensor is normal, replace the outdoor interface P.C. board.

Check code Operation cause

[d5]

TK2 sensor open/short

TK2 sensor alarm

Open/short of TK2 was detected. Check connection (TK2 sensor: CN515) and resistance

value characteristics of the sensor.

If sensor is normal, replace the outdoor interface P.C. board.

Check code Operation cause

[d6]

TK3 sensor open/short

TK3 sensor alarm

Open/short of TK3 was detected. Check connection (TK3 sensor: CN507) and resistance

value characteristics of the sensor.

If sensor is normal, replace the outdoor interface P.C. board.