Toshiba RAS-M10PKVP-E Service Manual page 104

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
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 the outdoor heat exchanger
sensor (TE) or suction temp.
sensor (TS)
Disconnection or short-circuit
of discharge temp. sensor
Outdoor fan drive system error
Being out of place, disconnection
or shortcircuit of the outdoor
temp. sensor (TO)
Compressor drive output
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 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.)
P.M.V. error
– 104 –
Air
conditioner 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.
——
All off 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 6-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 discharge 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.
1. Check LED (D800–D805) 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.