Fujitsu AUXB04GALH Service Manual page 162

Trouble shooting 77
No Cooling / No Heating
Check Point 1 : Check Indoor Unit
Does Indoor Unit FAN run on HIGH FAN?
Is Air Filter dirty?
Is Heat Exchanger clogged?
OK
Check Point 2 : Check Outdoor Unit Operation
Check if Outdoor Unit is operating
Check any objects that obstruct the air flow route.
Check clogged Heat Exchanger.
Is the pipe length setting (Push Switch "MODE/EXIT", "SELECT", "ENTER") suitable?
Is the Valve open?
OK
Check Point 3 : Check Site Condition
Is capacity of Indoor Unit fitted to Room size?
Any windows open? Or direct sunlight ?
OK
Check Point 4 :
Check Indoor/Outdoor Installation Condition
Check connection pipe (specified pipe length & Pipe diameter?)
Check any loose or removed communication line.
>> If there is an abnormal condition, correct it by referring to
Installation Manual or Design & Technical Manual.
OK
Check Point 5 : Check Refrigeration Cycle
Check if Strainer is clogged (Refer to the figure at right).
Measure Gas Pressure and if there is a leakage, correct it.
>> When recharging the refrigerant, make sure to perform
vacuuming, and recharge the specified amount.
Check EEV (Refer to the Service Parts Information)
Check Solenoid Valve (Refer to the See Service Parts Information)
Check Compressor ( Refer to the See Service Parts Information)
Check 4 way valve ( Refer to the See Service Parts Information)
Forecast of Cause :
1. Indoor Unit error 2. Outdoor Unit error
3. Effect by Surrounding environment
4. Connection Pipe / Connection Wire failure
Attention!!
Strainer normally does not have temperature difference
between inlet and outlet as shown in (1), but if there is a
difference like shown in (2), there is a possibility of
inside clogged. In this case, replace Strainer.
(1)
MPa MPa
(2)
04-86
5. Refrigeration cycle failure
Pipe (In)
Pipe (In)
Pipe (Out)
Pipe (Out)