Toshiba RAS-M10YKV-E Service Manual page 54

Block distinction
Check Check
Block
code code
Outdoor P.C.
board
Not
displayed
∗
Outdoor P.C.
board
Others
(including
compressor)
∗
For 1C and 1E marked with
Operation of diagnosis function
Cause of operation conditioner
Inverter over-current All off
protective circuit operates.
(Short time)
Position-detect circuit All off
error or short-circuit
between windings of
compressor
Current-detect circuit All off
error
Being out of place, All off
disconnection or short-
circuit of outdoor temp.
sensor
Disconnection or short- All off
circuit of exhaust temp.
sensor
Outdoor fan drive system All off
error
Outdoor heat exchanger Operation
temp. sensor error continues.
Compressor drive output All off
error, Compressor error
(lock, missing, etc.),
Break down
Error exclusive for All off
multiple type
Return serial signal has Operation
been sent when operation continues.
started, but it is not sent
from halfway.
(1) Compressor thermo.
operation
Gas shortage
Gas leak
(2) Instantaneous power
failure
Compressor does not All off
rotate. (Current protective
circuit does not operate
when a specified time
passed after compressor
had been activated.)
Discharge temp. All off
exceeded 120°C.
Break down of All off
compressor
Four-way valve inverse Operation
error (TC sensor value continues.
lowered during heating
operation.)
∗
, refer to the column in page 60.
– 54 –
Air
Remarkes
status
Displayed when
error is detected.
Displayed when
error is detected.
Displayed when
error is detected.
Displayed when
error is detected.
Displayed when
error is detected.
Displayed when
error is detected.
——
Displayed when
error is detected.
Displayed when
error is detected.
Flashes when
trouble is detected
on Return serial
signal, and normal
status when signal
is reset.
Displayed when
error is detected.
Displayed when
error is detected.
Displayed when
error is detected.
——
Judgment and action
Even if trying operation again, all
operations stop immediately. :
Replace P.C. board.
1. Even if connecting lead wire of
compressor is removed, position-
detect circuit error occurred. :
Replace P.C. board.
2. Measure resistance between wires
of compressor, and perform short-
circuit. : Replace compressor.
Even if trying operation again, all
operations stop immediately. : Replace
P.C. board.
Check 5-serial LED.
1. Check outdoor temp. sensors
(TE, TS).
2. Check P.C. board.
1. Check discharge temp. sensor
(TD).
2. Check P.C. board.
Position-detect error, over-current
protective operation of outdoor fan
drive system, fan lock, etc. : Replace
P.C. board or fan motor.
1. Check outdoor heat exchanger
temp. sensor (TE).
2. Check P.C. board.
Check 5-serial LED.
When 20 seconds passed after start-
up, position-detect circuit error
occurred. : Replace compressor.
Check 5-serial LED.
1. Miswiring of connecting wire of A/
B rooms in indoor/outdoor units
2. Check gas leakage.
3. Check disconnection of sensor.
4. Electronic control valve error
1. Repeat Start and Stop with interval
of approx. 10 to 40 minutes. (Code
is not displayed during operation.)
Supply gas. (Check also gas leak).
2. Unit operates normally during
check.
If Return serial signal does not
stop between indoor terminal block
2 and 3, replace inverter P.C.
board.
If signal stops between indoor
terminal block 2 and 3, replace
indoor P.C. board.
1. Trouble on compressor
2. Trouble on wiring of compressor
(Missed phase)
1. Check dischage temp. sensor (TD).
2. Degassing
3. Trouble on P.M.V.
1. Check power voltage.
(220–230–240 V ±10%)
2. Overload operation of refrigeration
cycle
Check installation condition
(Short-circuit of outdoor diffuser).
1. Check four-valve operation.