Fujitsu AU*G36LRLA Service Instruction page 82

Trouble shooting 35
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
Is outdoor unit is operating?
(If not, refer to Trouble shooting 33)
Is there any obstructing the air flow route?
Is there any clogging on outdoor unit Hert 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 unit / outdoor unit installation condition
Check connection pipe.
(Specified pipe length and 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
Check Compressor
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
difference like shown in
clogged. In this case, replace Strainer.
MPa MPa
02-37
5. Refrigeration cycle failure
, there is a possibility of inside
Pipe (In)
Pipe (In)
, but if there is a
Pipe (Out)
Pipe (Out)