Toshiba RAS-10YAV-E Service Manual page 44

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
Block
code code
Indoor P.C.
board etc.
Not
displayed
Connecting
cable and
serial signal
Table 10-4-1
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)
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.
– 44 –
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 P.C. board.
error is detected.
2. When P.C. board is normal, check
the motor.
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
is reset.
(2) Check 25A fuse of inverter P.C.
board.
(3) Check 3,15A 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 board 2 and
3, replace inverter P.C. board.
If signal stops between indoor
terminal board 2 and 3, replace
indoor P.C. board.
Flashes when If Return serial signal does not stop
trouble is detected between indoor terminal board 2 and 3,
on Operation replace inverter P.C. board.
command signal, If signal stops between indoor terminal
and normal status board 2 and 3, replace indoor P.C.
when signal is board.
reset.