Toshiba MMU-P0121H Service Manual page 81

Check code
[A0]
TD1 sensor alarm
Open/short of TD1 sensor was detected. Check disconnection of connector (TD1 sensor : CN502) and
characteristics of sensor resistance value.
When sensor is normal, replace interface P.C. board of the outdoor unit.
Check code
[A1]
TD2 sensor alarm
Open/short of TD2 sensor was detected. Check disconnection of connector (TD2 sensor : CN503) and
characteristics of sensor resistance value.
When sensor is normal, replace interface P.C. board of the outdoor unit.
Check code
[A2]
TS1 sensor alarm
Open/short of TS1 sensor was detected. Check disconnection of connector (TS1 sensor : CN504) and
characteristics of sensor resistance value.
When sensor is normal, replace interface P.C. board of the outdoor unit.
Operation cause
TD1 sensor open/short
Operation cause
TD2 sensor open/short
Operation cause
TS1 sensor open/short
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