Fujitsu ASU18RLF Service Instructions Manual page 83

Trouble shooting 38
No Cooling / No Heating
Test 1 : Check Indoor Unit
Does Indoor unit FAN run on HIGH FAN?
Is Air filter dirty?
Is Heat exchanger clogged?
Check if Energy save function is operated.
OK OK
Test 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 Valve open?
OK
Test 3 : Check Site Condition
Is capacity of Indoor unit fitted to Room size?
Any windows open? Or direct sunlight ?
OK
Test 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 Data & Technical
Manual.
OK
Test 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 (SERVICE PARTS INFORMATION 3)
Check Compressor (SERVICE PARTS INFORMATION 1,2)
Check Heater unit (SERVICE PARTS INFORMATION 7)
Forecast of Cause :
1. Indoor / Outdoor unit error.
2. Effect by surroudingding environment.
3. Connection pipe / Connection wire failure
4. Refrigeration cycle failure.
Attention
Strainer normally does not have temperature difference
between inlet and outlet as shown in
difference like shown in
clogged. In this case, replace Strainer.
PSI PSI
02-43
, there is a possibility of inside
Pipe (In)
Pipe (In)
, but if there is a
Pipe (Out)
Pipe (Out)