Friedrich ZQ08A10C - Manual (Page 19)

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4.3 TROUBLESHOOTING GUIDE
In general, possible trouble is classified in two kinds.
The one is called Starting Failure which is caused from an electrical defect. The other is Ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.
Unit runs but poor cooling is ineffective.
Ineffective Cooling
Check of outdoor coil
(heat exchanger) & fan
operation.
Check gas leakage.
Repair gas leak.
Replacement of unit if the
unit is beyond repair.
Satisfactory operation with
temperature difference of
inlet & outlet air ;
44~50
°
F(7~10
°
C)
Check heat load
increase.
Clean condenser.
Not on separate circuit
Check inside gas
pressure.
Adjusting of refrigerant
charge
Malfunction of compressor
Replacement of
compressor
Check of cold air circulation
for smooth flow.
Dirty indoor coil
(Heat exchanger)
Remove obstruction.
Check clogging in
refrigeration circuit.
Repair clogging in
refrigeration circuit.
Obstruction at air outlet
Clogged of air filter
Malfunction of fan