Toshiba MMU-P0121H Service Manual page 64

Check code
[17]
Current detect circuit system alarm
Is wiring connector on
IPDU P.C. board normal?
YES
Check IPDU P.C. board.
Check code
[18]
TE1 sensor alarm
TE1 sensor open/short has been detected. Check disconnection of connector (TE1 sensor : CN505) circuit and
resistance value characteristics of sensor.
When the sensors are normal, replace outdoor P.C. board.
Check code
[1C]
Extension IC, EEPROM alarm
Is there no irregularity of
outdoor unit power supply?
YES
Check interface P.C. board.
1. Defective wiring of IPDU P.C. board
2. Defective IPDU P.C. board
NO
TE1 sensor open/short
1. Outdoor unit power supply error
2. Interface P.C. board error
NO
3-61
Operation cause
Modify connection of wiring.
Operation cause
Operation cause
Check power supply voltage.
Modify power supply line.
Check noise from outside, etc.