Check
Si04-115
92
Service Diagnosis
6.1.9
Hall IC Check
Check No.16
1. Check the connector connection.
2. With the power ON, operation OFF, and the connector connected, check the following.
∗
Output voltage of about 5 V between pins 1 and 3.
∗
Generation of 3 pulses between pins 2 and 3 when the fan motor is operating.
Failure of (1)
$
faulty PCB
$
Replace the PCB.
Failure of (2)
$
faulty hall IC
$
Replace the fan motor.
Both (1) and (2) result
$
Replace the PCB.
6.1.10
Refrigerant System Check
Check No.17
Is any moisture
found in sight glass.
Is the
discharge thermistor
disconnected from
the holder?
YES
Is
the temperature
of 4 way valve suction pipe
abnormaly high?
Check for gas leaks. See the
section on insufficient gas
detection.
Refrigerant system check (gas
leaking, short of gas)
NO
NO
NO
YES
YES
Connect thermistor to holder properly.
Conduct vacuum drying.
Faulty 4 way valve, replace 4 way
valve.
Replace the refrigerant.
(R1079)
Conduct the check after operating the
equipment for a sufficient length of time.
