Toshiba RAS-M10PKVP-E Service Manual page 78

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
status
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 the outdoor
heat exchanger sensor
(TE) or suction temp.
sensor (TS)
Disconnection or short- All off
circuit of discharge
temp. sensor
Outdoor fan drive All off
system error
Being out of place, Operation
disconnection or short- continues.
circuit of the outdoor
temp. sensor (TO)
Compressor drive output All off
error, Compressor error
(lock, missing, etc.).
Break down
• Disconnection or
short-circuit of the
gas side sensor (TG).
• Communication error
between MCUs on
outdoor P.C. board.
Return serial signal Operation
has been sent when continues.
operation started, but it
is not sent from halfway.
1) Compressor thermo.
operation
Gas shortage
Gas leak
2) Instantaneous
power failure
Compressor does All off
not rotate. (Current
protective circuit does
not operate when a
specifi ed time passed
after compressor had
been activated.)
Discharge temp. All off
exceeded 117°C
Break down of All off
compressor
4-way valve inverse Operation
error (TC sensor value continues.
lowered during heating
operation.)
P.M.V. error All off
– 78 –
Air
Remarks
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.
—
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.
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.
Check 5-serial LED.
When 20 seconds passed after start-up,
position-detect circuit error occurred. :
Replace compressor. Trouble on P.M.V.
• Check gas side temp. sensor (TG).
• Check P.C. board.
• Check communication wire between
outdoor P.C. board.
• Check outdoor P.C. board.
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 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 4-way valve operation.
1. Check LED (D09–D13) on inverter
P.C. board.
2. Check connection of P.M.V. wiring.
3. Start operation. (Excluding error room)
4. If the same error is occurred.Replace
P.M.V.