Four Way Valve Performance Check; Inverter Unit Refrigerant System Check - Daikin FTXZ25NV1B Service Manual

SiMT041311E
3.6

Four Way Valve Performance Check

Check No.13
(Fig. 1)
3.7

Inverter Unit Refrigerant System Check

Check No.14
Service Diagnosis
< Caution on resetting the power supply >
∗ Be sure to wait for 30 sec. or more after turning off the power.
Turn off the power and turn it on
again.
S80 voltage
at 0 VDC with
compressor on?
YES
Start heating operation.
S80
voltage at 120 ~
220 VDC for 3 sec. after
compressor starts, and then at
about 12 ~15 VDC?
(Fig. 1)
YES
Disconnect the four way valve coil
from the connector and check the
continuity.
Four way valve
coil resistance at
300 ~ 600 Ω?
YES
Voltage at S80
3 sec.
120 ~ 220 VDC
12 ~ 15 VDC
Compressor
ON
Refrigerant system check
Is the
discharge pipe
thermistor disconnected
from the holder?
NO
Check for refrigerant leakage.
See the service diagnosis on
refrigerant shortage (U0).
NO
∗ Four way valve coil
Cooling / Dry : No continuity
Heating : Continuity
NO
NO
Time
YES
Check
Replace the outdoor unit
PCB.
Replace the outdoor unit
PCB.
Replace the four way valve
coil.
Replace the four way valve.
(R13938)
Reconnect the thermistor.
Replace the refrigerant.
(R15833)
184