Toshiba RAS-M10YKV-E Service Manual page 83

10-4-3. 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 Check
code Block code
Indoor P.C.
board etc.
Not
displayed
Connecting
cable and
serial
signal
Table 10-4-1
Operation of diagnosis function
Cause of operation conditioner
status
Short-circuit or Operation
disconnection of the continues.
room temperature sensor
(TA sensor).
Being out of place, Operation
disconnection, continues.
short-circuit, or migration
of heat exchanger sensor
(TC 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
compressor thermo.
Gas shortage
Gas leak
Operation command Operation
signal is not sent to continues.
outdoor side.
– 83 –
Air
Remarks
Displayed when 1. Check the room temp. sensor.
error is detected.
2. When the room temp. sensor is
Displayed when 1. Check heat exchanger sensor.
error is detected.
2. When heat exchanger sensor is
Displayed when 1. Check P.C. board.
error is detected.
2. When P.C. board is normal, check
Displayed when Replace P.C. board.
error is detected.
Flashes when 1. When the outdoor unit never
trouble is detected
on Return serial
signal, and normal
status when signal
is reset.
2. To display [Other] block during
3. Unit operates normally during
Flashes when If Operation command signal does
trouble is detected not stop between indoor terminal
on Operation board 2 and 3, replace inverter P.C.
command signal, board.
and normal status If signal stops between indoor
when signal is terminal board 2 and 3, replace
reset. indoor P .C. board.
Judgment and action
normal, check P.C. board.
normal, check P.C. board.
the motor.
operate:
(1) Check connecting cable, and
correct if defective wiring.
(2) Check 30A fuse (F01) of
outdoor main P.C. board.
(3) Check 3.15A fuse (F04) of
outdoor main P.C. board.
operation, check compressor
thermo. operation and supply gas
(check gas leak also).
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.