Super Multi System - Toshiba

40
Is drain pump connected?
Does float switch operate?
Does drainage water collect?
Does drain pump operate?
Check for blockage of
drainage hose.
Troubleshooting
Diagnostic procedure for check code
Check code Status of air conditioner Operation cause
[0b] Operation stops for Multi 1. Float switch disconnection.
Drain pump fault Controller fault. 2. Drain pump operation error.
Indoor unit or Multi Indoor unit fan continues for 3. Drain hose blockage.
Controller unit fault.
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Yes
Yes
Yes
Yes
No
No
Is circuit wiring
normal?(*1)
(*1) For confirmation, check voltage under condition that
connector is connected to CN10, pins 5 and 7,
PJ10, pins 1 and 2
No
No
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Is power to drain
pump turned on?(*2)
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Yes
Drain pump error
Check code
[0C]
Operation cause
Indoor sensor (TA) short or open circuit alarm TA sensor open/short
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No
No
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Check connection of connector CN10
(Drain pump: Indoor main, PC board
(MCC-1292), CN10)
(Drain pump: Multi Controller, PC board
(MCC-1210) PJ10)
Check and modify wiring circuit.
(MCC-1292), (MCC-1210)
Indoor PC board error
(MCC-1292), (MCC-1210)
Float switch error
Check and modify wiring
circuit.
(*2) Check whether voltage of CN10/PJ10, pins
1 and 2/1 to 3 of the indoor main PC board,
is 230V or not (MCC-1292), (MCC-1210).
TA sensor open/short has been detected. Check disconnection of connector connection (TA sensor: CN04)
circuit and resistance value characteristics of sensor.
When the sensors are normal, replace indoor PC board (MCC-1292).
Check code Status of air conditioner Operation cause
[0D] Indoor unit fan stops. TC sensor open/short
Indoor sensor (TC) short ‘Preheat defrost’ is
or open circuit alarm displayed on R/C.
TC sensor open/short has been detected. Check disconnection of connection (TC sensor: CN05) circuit
and resistance value characteristics of sensor.
When the sensors are normal, replace indoor PC board (MCC-1292).