Daikin F-Series Service Manual page 262

SiBE12-712C
5.1.10 Inverter Units Refrigerant System Check
Check No.11
5.1.11 Capacitor Voltage Check
Check No.12 Before this checking, be sure to check the main circuit for short-circuit.
Service Diagnosis
Refrigerant system check
Is
the discharge
thermistor disconnected
from the holder?
NO
Is the
temperature of
the four way valve suction
pipe abnormaly
high?
NO
Check for gas leaks.
See the section on insufficient gas
detection.
Checking the capacitor voltage
With the circuit breaker still on, measure the voltage according to the drawing. Be careful
never to touch any live parts.
DB1
LED5
S90
Thermistor
lead wire
YES
YES
LED A
S70 S80
Fan motor Four way valve
lead wire lead wire
Correct the problem.
Four way valve defective.
Replace the four way valve.
Replace the refrigerant.
Multi meter
(DC. voltage
range)
S20
Electronic
expansion
valve coil
(R6027)
Check
(R8441)
251