Fujitsu ASU18RMLQ Service Instruction page 69

Trouble shooting 39
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?
Check if Energy save function is operated.
OK OK
Check Point 2 : Check Outdoor Unit Operation
Check if Outdoor Unit is operating
(If not, refer to Trouble shooting 30)
Check any objects that obstruct the air flow route.
Check clogged Heat Exchanger.
Is the Valve open?
OK OK
Check Point 3 : Check Site Condition
Is capacity of Indoor Unit fitted to Room size?
Any windows open? Or direct sunlight ?
OK 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 Data & Technical
Manual.
OK 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 (PARTS INFORMATION 4)
Check Compressor (PARTS INFORMATION 1,2)
Forecast of Cause:
1. Indoor Unit error 2. Outdoor Unit error
3. Effect by Surrounding environment
4. Connection Pipe / Connection Wire failure 5. 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)