Check
SiBE12-908
172
Service Diagnosis
3.14
Four-way Valve Performance Check
Check No.31
Start the heating-mode run.
Replace the outdoor unit
PCB.
Replace the four way valve
coil.
Replace the four way valve.
(R9462)
NO
∗
Four way valve coil
Cooling / dry : No continuity
Heating : Continuity
YES
YES
Four way valve
coil resistance at
300 ~ 600
Ω
?
NO
S80 voltage at DC 130-230
V for 3 sec. after
compressor starts, and
then at about DC 12 ~15V
after that? (Fig. 1)
Turn off the power and turn it on
again.
Replace the outdoor unit
PCB.
NO
YES
S80 voltage at
DC 0 V with
outdoor unit on?
Disconnect the four way valve coil
from the connector and check the
continuity.
(Fig. 1)
Voltage at S80
DC180-280V
DC12~15V
Time
Compressor
ON
3 sec.
< Caution on resetting the power supply >
∗
Be sure to wait for 30 sec. or more after turning off the power supply.