High Wall, Heat Pump Type
Service Manual
79
Toshiba
Outdoor
P.C. board
Being out of place,
disconnection or short-
circuit of the outdoor heat
exchanger sensor (TE) or
suction temp. sensor (TS)
All off
Displayed when
error is detected.
1) Check sensors (TE, TS).
2) Check P.C. board.
Disconnection or short-
circuit of discharge temp.
sensor
All off
Displayed when
error is detected.
1. Check discharge temp. sensor (TD).
2. Check P.C. board
Outdoor fan drive system
error
All off
Displayed when
error is detected.
Position-detect error, over-current
protective operation of outdoor fan drive
system, fan lock, etc. :
Replace P.C. board or fan motor.
Not
displayed.
Being out of place,
disconnection or short-
circuit of the outdoor temp.
sensor (TO)
Operation
continues
——
1. Check outdoor temp. sensor (TO).
2. Check P.C. board.
Outdoor
P.C. board
Compressor drive output
error, Compressor error
(lock, missing, etc.), Break
down
All off
Displayed when
error is detected.
1) Check power voltage.
(220–230–240 V +10%)
2) Overload operation of refrigeration cycle
Check installation condition (Short-
circuit of outdoor diffuser).
3) When 20 seconds passed after start-up,
position-detect circuit error occurred. :
Replace compressor.
Trouble on P.M.V.
Others
(including
compressor)
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
Operation
continues
Flashes when
trouble is
detected on
return serial
signal, and
normal status
when signal is
reset.
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.
Compressor does not
rotate.
(Current protective circuit
does not operate when a
specified time passed after
compressor had been
activated.)
All off
Displayed when
error is detected.
1) Trouble on compressor
2) Trouble on wiring of compressor
(Missed phase)
Discharge temp. exceeded
117°C
All off
Displayed when
error is detected.
1) Check discharge temp. sensor (TD).
2) Gas leakage
3) Trouble on P.M.V.
Break down of compressor
All off
Displayed when
error is detected.
1) Check power voltage.
(220–230–240 V +10%)
2) Overload operation of refrigeration cycle
Check installation condition (Short-
circuit of outdoor diffuser).
4-way valve inverse error
(TC sensor value lowered
during heating operation.)
Operation
continues
——
1) Check 4-way valve operation.
Block distinction
Operation of diagnosis function
Judgment and action
Check
code
Block
Check
code
Cause of operation
Air
conditioner
status
Remarks
+00A08-010_01EN_SVM_HighWallHeatPump.book Page 79 Wednesday, March 4, 2009 11:22 AM
