Toshiba RAS-M10YKV-E Service Manual page 53

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.
(3) After servicing, reset the check code by sending [
Then, the non-volatile memory is reset.
Block distinction
Check Check
Block
code code
Indoor P.C.
board etc.
Not
displayed
Connecting
cable and
serial signal
Table 10-4-1
Operation of diagnosis function
conditioner
Cause of operation
Short-circuit or discon- Operation
nection 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)
Lock of indoor fan or All off
trouble on the indoor fan
circuit
Operation
Trouble on other indoor
P.C. boards continues.
Return serial signal is not Operation
continues.
sent to indoor side from
operation started.
(1) Defective wiring of
connecting cable
(2) Operation of compres-
sor thermo.
Gas shortage
Gas leak
Operation command Operation
signal is not sent to continues.
outdoor side.
– 53 –
] to the indoor unit in the service mode.
Air
Remarks
status
Displayed when 1. Check the room temp. sensor.
2. When the room temp. sensor is
error is detected.
1. Check heat exchanger sensor.
Displayed when
error is detected. 2. When heat exchanger sensor is
1. Check P.C. board.
Displayed when
error is detected. 2. When P.C. board is normal, check
Replace P.C. board.
Displayed when
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
not stop between indoor terminal
trouble is detected
on Operation board 2 and 3, replace inverter P.C.
command signal,
and normal status
when signal is
reset.
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 25A fuse of inverter P.C.
board.
(3) Check 3,15A of inverter 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.