[D2] Slave Outdoor Unit Alarm; [D3] Th Sensor Alarm; [D4] Oil Temp. (Tk1) Sensor Alarm; [D5] Oil Temp. (Tk2) Sensor Alarm - Toshiba HFCR407C Service Manual

Check code
[d2]
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
[d3]
TH sensor alarm
There is an error with the temp. sensor incorporated in IGBT. Check connectors CN07 on IPDU PC board and
CN600 on interface PC board. If there is no problem, replace IPDU PC board.
Check code
[d4]
Oil temp. (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 PC board.
Check code
[d5]
Oil temp. (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 PC board.
Check code
[d6]
Oil temp. (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 PC board.
Troubleshooting
Diagnostic procedure for check code
107
Operation cause
Defective slave outdoor unit
Operation cause
Error of temp. sensor incorporated in IGBT
(Inverter Gate Bi-Polar Transistor)
Operation cause
TK1 sensor open/short
Operation cause
TK2 sensor open/short
Operation cause
TK3 sensor open/short
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