High Wall, Heat Pump Type
Service Manual
80
Toshiba
10-7.Judgment of Trouble by Symptom
10-7-1. Power of Indoor Unit Does not Turned on (Does not Operate
Entirely)
Primary check
1) Is the supply voltage normal?
2) Is the normal voltage provided to the outdoor unit?
3) Is the crossover cable connected properly?
4) Is the fuse (F01) blown?
NOTE
Be sure to disconnect the motor connector CN301 after shut off the power supply, or it will be a cause of damage
of the motor.
10-7-2. Power of Indoor Unit Does not Turned on Though Indoor
P.C. Board is Replaced
Confirmation procedure
NO
Turn off power supply once, and
5 second later, turn it on again.
Is OPERATION indicator flashing?
Is it possible to turn on
power supply by pushing
[START/STOP] button
on remote controller?
Is voltage
(DC12V or 5V)
indicated on rear of
indoor control
board normal?
Does transmission mark
on remote controller flash
normally,and is its signal
transmitted properly?
Is DC310-340V
supplied between
CN301 [1] - [3]?
Does fan motor
connector between
CN301 [1] - [3]
short-circuit?
Item by symptoms
Operation
Check Item
Considerable principle cause
Measures
Parts (R01, R02, DB01, C01,
C03, IC101 and T101) are defective.
Remote controller is defective.
Refer to (5) “Troubleshooting
for remote controller”.
Parts of a power supply circuit
defective.
Unit operates normally.
Replace main
P.C. board
Replace fan
motor.
Is fuse (F01)
of indoor control
board blown?
Microcomputer
is defective.
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
To item of
“Power supply is not turned on”.
Turn on power supply.
Does OPERATION indicator flash?
Is wired correctly to white and
black lead wires of terminal block?
Correct wiring.
+00A08-010_01EN_SVM_HighWallHeatPump.book Page 80 Wednesday, March 4, 2009 11:22 AM
