Toshiba MMU-P0121H Service Manual page 90

Check code
[d2]
Server outdoor alarm
An error occurs in the server outdoor unit. Confirm the check code of the server 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 connection of 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
[d4]
TK1 sensor alarm
Open/short of TK1 was detected. Check connection (TK1 sensor : CN516), disconnection of circuit, and
resistance value characteristics of the sensor.
If sensor is normal, replace the outdoor interface P.C. board.
Check code
[d5]
TK2 sensor alarm
Open/short of TK2 was detected. Check connector (TK2 sensor : CN515), disconnection of circuit, and
resistance value characteristics of the sensor.
If sensor is normal, replace the outdoor interface P.C. board.
Check code
[d6]
TK3 sensor alarm
Open/short of TK3 was detected. Check connection (TK3 sensor : CN507), disconnection of circuit, and
resistance value characteristics of the sensor.
If sensor is normal, replace the outdoor interface P.C. board.
Operation cause
Defective server outdoor unit
Operation cause
Error of temp. sensor incorporated in IGBT
Operation cause
TK1 sensor open/short
Operation cause
TK2 sensor open/short
Operation cause
TK3 sensor open/short
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