Daikin SkyAir Service Manual page 193

Troubleshooting by Remote Controller Display / LED Display
Troubleshooting
*1: Voltage measurement point
182
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Is the stop valve open?
YES
Is it in cooling operation?
(In heating
operation)
YES
(In cooling
operation)
Is
the pressure
sensor (connector :
X17A) properly connected
to the outdoor
PC board?
YES
Measure voltage between
the connector pins (1) and
(3) above. (refer to *1)
Is
the relation
between low pressure
and voltage normal?
(refer to *2)
YES
Is low-pressure
abnormally low?
Check 7
YES
NO
NO
Is
the heat
exchanger distribution pipe
thermistor (connector : X12A) properly
connected to the outdoor
PC board?
YES
NO
Remove the thermistor from the
outdoor PC board and measure
resistance between the pins (5)
and (6).
Is
it normal?
(See )
Check 11
(P235)
NO
YES
NO
(P231)
*2: "Pressure Sensor", pressure / voltage characteristics table.
3.0
2.5
2.0
1.5
1.0
0.5
0
-0.5
-0.5
Open the stop valve.
NO
Connect the connector
properly.
Connect the connector
properly.
NO
Replace the group
thermistor.
Replace the pressure
sensor.
Replace the outdoor PC
board (A1P).
∗ Replace the PC
board equipped
with resin case.
Correct the refrigerant
system defect.
PH
PH = 1.38V-0.69
PH : Detected pressure (MPa)
V : Output Voltage (V)
0 0.5 1 1.5 2 2.5 3 3.5 4
Output voltage V V
DC
Troubleshooting
SiBE28-804