Toshiba RAS-M10PKVP-E Service Manual page 97

11-4-2. 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.
Block distinction
Check Check
Block
code code
Indoor P .C.
board etc.
Not
displayed
Connecting
cable and
serial signal
Table 11-4-1
Operation of diagnosis function
Air
Cause of operation conditioner
status
Short-circuit or Operation
disconnection of the room continues.
temperature sensor
(TA sensor).
Being out of place, Operation
disconnection, short- continues.
circuit, or migration of
heat exchanger sensor
(TC sensor)
Being out of place, Operation
disconnection, short- continues.
circuit, or migration of
heat exchanger sensor
(TCj sensor)
Lock of indoor fan or All off
trouble on the indoor fan
circuit
Trouble on other indoor Operation
P .C. boards continues.
Return serial signal is not Operation
sent to indoor side from continues.
operation started.
1) Defective wiring of
connecting cable
2) Operation of compres-
sor thermo Gas
shortage Gas leak
– 97 –
Judgment and action
Remarks
Displayed when 1. Check the room temp. sensor.
error is detected.
2. When the room temp. sensor is
normal, check P .C. board.
Displayed when 1. Check heat exchanger sensor.
error is detected.
2. When heat exchanger sensor is
normal, check P .C. board.
Displayed when 1. Check heat exchanger sensor.
error is detected.
2. When heat exchanger sensor is
normal, check P .C. board.
Displayed when 1. Check the motor.
error is detected.
2. When the motor is normal, check
P .C. board.
Displayed when Replace P .C. board.
error is detected.
Flashes when 1. When the outdoor unit never
trouble is detected operate:
on Return serial
1) Check connecting cable, and
signal, and normal
correct if defective wiring.
status when signal
2) Check 25A fuse of inverter
is reset.
P .C. board.
3) Check 6.3A fuse of connect-
ing 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.