Toshiba RAS-M10U2MUVG-E Service Manual page 50

10-4-2. Caution at Servicing
1. After servicing, press the [CLR] 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, press [CLR] button under check mode status and then send the check code "7F" to the
indoor unit. The check code stored in memory is cleared.
B o l c k i d t s n i t c o i n
Check
Block
code
Indoor P.C.
board etc.
Not
displayed
Wired
Remote
Controller
Indoor P.C.
board
Indoor P.C.
board
Connecting
cable and
serial
signal
O p r e t a o i n f o
Check
Cause of operation
code
Short-circuit or
disconnection of the
room temperature
sensor (TA sensor).
Being out of place,
disconnection,
shortcircuit, or
migration of heat
exchanger sensor
(TC sensor)
Being out of place,
disconnection, short-
circuit, or migration of
heat exchanger
sensor (TCJ sensor).
Lock of indoor fan or
trouble on the indoor
fan circuit
Float SW operation
Trouble on other
indoor P.C. boards
Communication with
wired remote
conroller is trouble.
Capacity Date is not
set.
Disconnection of
the occupancy
sensor.
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
Table 10-4-2
d a i g n o s s i u f n t c o i n
Air
conditioner Remarks
status
Operation Displayed when
continues. trouble is detected.
Operation Displayed when
continues. trouble is detected.
Operation Displayed when
continues. trouble is detected.
All off Displayed when
trouble is detected.
Operation Displayed when
continues. trouble is detected.
(Outdoor
units stop.)
Operation Displayed when
continues. trouble is detected.
Displayed when
trouble is detected.
Displayed when
trouble is detected.
Operation Displayed when
continues. trouble is detected.
Operation Flashes when
continues. trouble is
detected on
Return serial
signal, and
normal status
when signal is
reset.
– 50 –
Judgment and action
1. Check the room temp. sensor.
2. When the room temp. sensor is
normal, check P.C. board.
1. Check heat exchanger sensor.
2. When heat exchanger sensor is
normal, check P.C. board.
1. Check heat exchanger sensor.
2. When heat exchanger sensor is
normal, check P.C. board.
1. Check the motor.
2. When the motor is normal, check P.C.
board.
1. Check the drainage.
1) Amount of residual drain.
2) Drain water piping installation
situation.
2. Float SW operation check
3. Check disconnection of connector.
Replace P.C. board.
Check wired remote controller
connection.
Set Function Code 11 properly.
1. Check power supply / communication
harness.
2. Check P.C. board.
1. When the outdoor unit never operate:
1) Check connecting cable, and
correct if defective wiring.
2) Check fuse of inverter P.C. board.
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 2 and 3,
replace inverter P.C. board.
If signal stops between indoor
terminal 2 and 3, replace indoor P.C.
board.