High Wall, Heat Pump Type
Service Manual
78
Toshiba
10-6-2.Check Code
1) After servicing, push the START/STOP button to return to the normal mode.
2) After servicing by the check code, turn off breaker of the power supply, and turn on breaker of the power
supply again so that memory in the microcomputer returns the initial status.
However, the check codes are not deleted even if the power supply is turned off because they are stored
in the fixed memory.
3) After servicing, push [CLR] button under check mode status and then send the check code “7F” to the
indoor unit. The error code stored in memory is cleared.
Table 10-6-1
Block distinction Operation of diagnosis function
Judgment and action
Check
code
Block
Check
code
Cause of operation
Air
conditioner
status
Remarks
Indoor P.C.
board etc.
Short-circuit or
disconnection of the room
temperature sensor
(TA sensor).
Operation
continues.
Displayed when
error is detected.
1) Check the room temp. sensor.
2) When the room temp. sensor is normal,
check P.C. board.
Being out of place,
disconnection, short-
circuit, or migration of heat
exchanger sensor
(TC sensor)
Operation
continues.
Displayed when
error is detected.
1) Check heat exchanger sensor.
2) When heat exchanger sensor is normal,
check P.C. board.
Being out of place,
disconnection, short-
circuit, or migration of heat
exchanger sensor
(TCj sensor)
Operation
continues.
Displayed when
error is detected.
1) Check heat exchanger sensor.
2) When heat exchanger sensor is normal,
check P.C. board.
Lock of indoor fan or
trouble on the indoor fan
circuit
All off Displayed when
error is detected.
1) Check the motor.
2) When the motor is normal, check P.C.
board.
Not
displayed
Trouble on other indoor
P.C. boards
Operation
continues.
Displayed when
error is detected.
1) Replace P.C. board.
Connecting
cable and
serial signal
Return serial signal is not
sent to indoor side from
operation started.
1) Defective wiring of
connecting cable
2) Operation of
compressor thermo Gas
shortage Gas leak
Operation
continues.
Flashes when
trouble is
detected on
Return serial
signal, and
normal status
when signal is
reset.
1) When the outdoor unit never operate:
• Check connecting cable, and correct if
defective wiring.
• Check 25A fuse of inverter P.C. board.
• Check 6.3A fuse of connecting cable
of inverter unit and outdoor unit.
2) To display [Other] block during
operation, check compressor thermo.
operation and supply gas (check gas
leak also).
3) Unit operates normally during check.
If return serial signal does not stop
between indoor terminal board 2 and 3,
replace inverter P.C. board.
If signal stops between indoor terminal
board 2 and 3, replace indoor P.C.
board.
Outdoor
P.C. board
Inverter over-current
protective circuit operates.
(Short time)
All off Displayed when
error is detected.
Even if trying operation again, all
operations stop immediately. :
Replace P.C. board.
Position-detect circuit error
or short-circuit between
windings of compressor
All off Displayed when
error is detected.
1) Even if connecting lead wire of
compressor is removed, position detect
circuit error occurred. :
Replace P.C. board.
2) Measure resistance between wires of
compressor, and perform short-circuit. :
Replace compressor.
Current-detect circuit error All off Displayed when
error is detected.
Even if trying operation again, all
operations stop immediately. :
Replace P.C. board.
+00A08-010_01EN_SVM_HighWallHeatPump.book Page 78 Wednesday, March 4, 2009 11:22 AM
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