Toshiba RAS-M10GDCV-E Service Manual page 45

11-4-2. Caution at Servicing
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.
Block distinction
Check
Block
code
Indoor P .C.
board etc.
(Only when
drain-up kit
(option) is
connected)
Connecting
cable and
serial signal
Operation of diagnosis function
Check
Cause of operation
code
Short-circuit or
disconnection of the
room temperature
sensor (TA sensor).
Being out of place,
disconnection,
short-circuit, or
migration of heat
exchanger sensor
(TC sensor)
Lock of indoor fan or
trouble on the indoor
fan circuit
Float SW operation
Trouble on other indoor
P .C. boards
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 11-4-1
Air
conditioner Condition
status
Operation Displayed when
continues. error is detected.
Operation Displayed when
continues. error is detected.
All off Displayed when
error is detected.
Operation Displayed when
continues. error is detected.
(Outdoor
units stop.)
Operation Displayed when
continues. error is detected.
Operation Flashes when
continues. trouble is detected
on return serial
signal, and normal
status when signal
is reset.
– 45 –
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 P.C. board.
2. When P.C. board is normal, check
the motor.
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.
1. When the outdoor unit never
operate:
(1) Check connecting cable, and
correct if defective wiring.
(2) Inverter check
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.