Four Way Valve Performance Check; Inverter Unit Refrigerant System Check - Daikin FTXN25KEV1B Service Manual

Check
5.5

Four Way Valve Performance Check

Check No.13
5.6

Inverter Unit Refrigerant System Check

Check No.14
90
Turn off the power and turn it on
again.
Start heating operation.
S80
voltage at 220 - 240
VAC with compressor
on? (Fig. 1)
YES
Disconnect the four way valve coil
from the connector and check the
continuity.
Four way
valve coil resistance at
1000 ~ 2000 Ω?
YES
(Fig. 1)
Voltage at S80
220 - 240 VAC
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).
∗ Four way valve coil
Cooling / Dry : No continuity
Heating : Continuity
NO
NO
Time
YES
SiBE041102_A
Replace the outdoor unit
PCB.
Replace the four way valve
coil.
Replace the four way valve.
(R11903)
(R11904)
Place the thermistor.
Replace the refrigerant.
(R8259)
Service Diagnosis