Caution At Servicing - Toshiba RAS-M10NKV-E Service Manual

8-4-2. Caution at Servicing

(1) After servicing, push the [
(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
] button to return to the normal mode.
Table 10-4-1
Operation of diagnosis function
conditioner
Cause of operation
status
Short-circuit or disconnec- Operation
tion of the room tempera- continues.
ture sensor (TA sensor).
Coming-off, 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.
– 36 –
Air
Condition
Displayed when 1. Check the room temp. sensor.
error is detected. 2. When the room temp. sensor is
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
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 not
trouble is detected stop between indoor terminal board 2
on Operation and 3, replace inverter P.C. board.
command signal, If signal stops between indoor
and normal status terminal board 2 and 3, replace indoor
when signal is P.C. board.
reset.
FILE NO. SVM-05019
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 ( or 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.