73
Check of R.V. coil
H
Is there 230V AC between CN721 and
on the power P.C. board 3 minutes after
the power supply is turned ON?
Yes
No
Replace the
power P.C. board.
Replace the 4-way valve.
CN721
Power P.C. board
(soldered side)
Disconnect connector (CN61) between
compressor and intelligent power module.
[
For wireless remote controller use model
]
Turn ON the power supply and press the
EMERGENCY OPERATION switch
(COOL switch).
[For wired remote controller use model]
Turn ON the power supply and press the
TEST button twice (COOL mode).
Is there 230V AC between CN721 and
on the power P.C.board 3 minutes after
the power supply is turned ON?
No
Yes
Disconnect connector (CN61) between
compressor and intelligent power module.
[
For wireless remote controller use model
]
Turn ON the power supply and press the
EMERGENCY OPERATION switch
(HEAT switch).
[For wired remote controller use model]
Turn ON the power supply and press the
TEST button twice (HEAT mode).
Replace the
power P.C. board.
• Defective R.V. coil
• Defective 4-way valve
+First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 12-4..
+In case CN721 is not connected or R.V. coil is open, voltage is generated between the terminal pins of the connector although no
signal is being transmitted to R.V. coil. Check if CN721 is connected.
Unit operates COOL mode even if it is set to HEAT mode.
Unit operates HEAT mode even if it is set to COOL mode.
The thermistors in the outdoor unit are abnormal.
Check of outdoor thermistors
G
[SUZ-KA25/35VA(H).TH]
Measure the
resistance
between CN641
and .
Measure the
resistance
between CN642
and .
No
Yes
Replace the
thermistor
except RT64.
In case that
RT64 is
abnormal,
replace the
inverter P.C.
board, since
RT64 is
combined with
the inverter P.C.
board.
Replace the inverter
P.C. board.
Disconnect the connectors CN641, CN642 and CN643 from the inverter P.C. board.
(Check the characteristics of each thermistor.)
Defrost thermistor RT61
Measure the
resistance
between CN641
and .
Reconnect the
connectors
CN641, CN642
and CN643.
Turn ON the
power supply and
press
EMERGENCY
OPERATION
switch (For
wireless remote
controller use
model)./TEST
button twice (For
wired remote
controller use
model).
Discharge
temperature
thermistor RT62
Fin temperature
thermistor RT64
Is the resistance of
thermistor normal?
(Refer to 12-6.1.)
No
Yes
Does the unit operate
10 minutes or more?
OK.
(Cause is poor
contact.)
Measure the
resistance
between CN643
and .
Ambient
temperature
thermistor RT65
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