Four Way Valve Performance Check; Inverter Unit Refrigerant System Check - Daikin FTX20K(2)V1B Service Manual

SiBE041525F
5.5

Four Way Valve Performance Check

Check No.13
5.6

Inverter Unit Refrigerant System Check

Check No.14
Service Diagnosis
Turn off the power. Then, turn on
the power to restart the system.
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: Not energized
Heating: Energized
NO
NO
Time
YES
Check
Replace the outdoor unit
PCB (main PCB).
Replace the four way valve
coil.
Replace the four way valve.
(R21439)
(R11904)
Reconnect the discharge
pipe thermistor.
Replace the refrigerant.
(R22766)
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