Toshiba RAS-10UKV-E Service Manual page 50

Block distinction
Check Check
Block
code code
Outdoor
P.C. board
Not
displayed
Outdoor
P.C. board
Others
(including
compres-
sor)
Operation of diagnosis function
Cause of operation
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 short-
circuit of outdoor temp.
sensor
Disconnection or short-
circuit of discharge temp.
sensor
Outdoor fan drive system
error
Outdoor heat exchanger
temp. sensor error
Compressor drive output
error, Compressor error
(lock, missing, etc.),
Break down
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
Four-way valve inverse error
(TC sensor value lowered
during heating operation.)
Air conditioner
Remark
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 ——
– 49 –
FILE NO. SVM-02007
Judgement and action
Even if trying operation again, all
operations stop immediately. :
Replace P.C. board.
1. Even if connecting lead wire of
compres sor 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 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.
When 20 seconds passed after start
up, position-detect circuit error
occurred. : Replace compressor.
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 2 and 3 of the
indoor terminal block, replace
inverter P.C. board. If signal stops
between 2 and 3 of the indoor
terminal block, replace indoor
P.C. board.
1. Trouble on compressor
2. Trouble on wiring of compressor
(Missed phase)
1. Check discharge temp. sensor (TD).
2. Degassing
3. Trouble on P.M.V.
1. Check power voltage. (220-240 V
+ 10%)
2. Overload operation of refrigeration
cycle
Check installation condition
(Short-circuit of outdoor diffuser.)
1. Check 4 way valve operation.