Toshiba RAS-18N3KV-E Service Manual page 72

Block distinction
Check Check
Block
code
code
Outdoor
P.C. board
Not
displayed
Outdoor
P.C. board
Others
(including
compressor)
Operation of diagnosis function
Cause of operation conditioner
Inverter over-current
protective circuit operates.
(Short time)
Position-detect circuit error
or short-circuit between
windings of compressor
Current-detect circuit error
Being out of place,
disconnection or
shortcircuit of the outdoor
heat exchanger sensor
(TE) or suction temp.
sensor (Ts)
Disconnection or
shortcircuit of discharge
temp. sensor
Outdoor fan drive system
error
Outdoor heat exchanger
temp. sensor error
Compressor drive output
error, Compressor error
(lock, missing, etc.)
Return serial signal has
been sent when operation
started, but it is not sent
from halfway.
1) Compressor thermo.
operation
Gas shortage
Gas leak
2) Instantaneous power
failure
Compressor does not
rotate.(Current protective
circuit does not operate
when a specified time
passed after compressor
had been activated.)
Discharge temp. exceeded
117°C
Break down of compressor
4-way valve inverse error
(TC sensor value lowered
during heating operation.)
–
Air
Remarks
status
All off Displayed when
error is detected.
All off Displayed when
error is detected.
All off Displayed when
error is detected.
All off Displayed when
error is detected.
All off Displayed when
error is detected.
All off Displayed when
error is detected.
Operation
continues
——
All off Displayed when
error is detected.
Operation Flashes when
continues trouble is detected
on return serial
signal, and normal
status when signal
is reset.
All off Displayed when
error is detected.
All off Displayed when
error is detected.
All off Displayed when
error is detected.
Operation
continues ——
–
71
FILE NO. SVM-12071
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.
1. Check 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 temp. sensor (TO).
2. Check P.C. board.
When 20 seconds passed after
start-up, position-detect circuit error
occurred. : Replace compressor.
Trouble on PMV
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. Gas leakage
3. Trouble on PMV
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 4-way valve operation.