Toshiba RAS-13UKHP-ES4 Service Manual page 64

9-5-6. Only 4-Way valve does not operate (During heating operation)
Heat Pump Model
Shut off the power supply
from AC outlet once and
turn it on after 5 seconds.
Does the OPERATION lamp blink?
YES
Does the power turn on by
pushing the [START/STOP] button
of the remote control?
YES
Is the voltage across the indoor terminal
( - ) 220-240V?
2 3
YES
Is cable connection between indoor
and outdoor units correct?
YES
Is the voltage across the outdoor terminal
( - ) 220-240V?
2 3
YES
Is the wiring of solenoid coil for
4-way valve normal?
YES
4-way valve is defective.
NO
See "Power can not be turned on".
NO
See "Power can not be turned on".
NO
Relays (RY04) or IC31
or IC30 is failure.
NO
Correct cabling between indoor
and outdoor units.
NO
Cables between indoor
and outddor units are defective.
NO
Solenoid coil is defective.
− 63 −
FILE NO. SVM-05020
Replace the P.C.
board.