Toshiba MMU-P0121H Service Manual page 61

<For 4-way Air Discharge Cassette type>
Check code
[0b]
Indoor water overflow alarm
Is connection of
float switch connector
(Indoor main P.C. board
(MCC-1361)) CN11 normal?
YES
Does float switch operate?
YES
Does drainage water collect?
YES
Does drain pump operate?
YES
Check for blockage of
drainage hose.
Check code
[0C] Indoor TA sensor alarm
TA sensor open/short has been detected. Check disconnection of CN04 connector connection circuit
(TA sensor : Indoor main P.C. board (MCC-1361) and characteristics of sensor resistance value.
When the sensor is normal, replace indoor main P.C. board (MCC-1361)
1. Float switch disconnection
2. Drain pump operation error
3. Drain pipe blockage
NO
NO
Is circuit wiring normal?
YES
NO
NO
Is power of drain pump
turned on? (
YES
Drain pump error
TA sensor open/short
3-58
Operation cause
Modify connection of connector CN11.
(Drain pump :Indoor main P.C. board (MCC-1361))
NO
Check and modify wiring circuit.
Indoor main P.C. board
NO
Indoor main P.C. board
1)
*
( 1) Check whether voltage of CN08 1
*
to 3 pins of indoor main P.C. board
(MCC-1361) is 220–240V, 50Hz
( 220V, 60Hz
Operation cause
(MCC-1361) error
Float switch error
(MCC-1361) failure
) or not.