Daikin D Series Service Manual page 185

Check
5.1.8 Inverter Units Refrigerant System Check
Check No.11
Refrigerant system check
Check for gas leaks.
See the section on insufficient gas
detection.
5.1.9 Capacitor Voltage Check
Check No.12 Before this checking, be sure to check the main circuit for short-circuit.
176
Is
the discharge
thermister disconnected from
the holder?
NO
Is the temperature
of the four way valve suction pipe
abnormaly high?
NO
Is any moisture
found in sight glass?
NO
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.
Use the tester
in the DC range.
YES
YES
YES
Conduct the check after operating the
equipment for a sufficient length of time.
Diode Bridge (DB1)
(back side of the PCB)
SiBE12-519
Correct the problem.
Four way valve defective.
Replace the four way valve.
Conduct vacuum drying.
Replace the refrigerant.
(R3050)
LED A
(back side of the slit)
(R3051)
Service Diagnosis