–49–
Symptom and operation when normal
7. Remote controller display is normal
and heating operation is performed
but without any capacity (does no
t
heat).
Cause
1
Insufficient refrigerant.
2
Refrigerant piping heat insulation insuffi-
cient.
3
Filter clogged.
4
Indoor unit heat exchanger clogged.
5
Air duct short cycle.
6
Outdoor unit bypass circuit faulty.
Symptom judgment and remedy
1
- Since the discharge temperature rises when
there is leakage, judge by measuring the tem-
perature.
- Check piping connections, etc. for gas leak-
age.
2
Check heat insulation.
3
Open intake grille and check filter.
Clean filter, and remove dust and dirt.
4
- Since the indoor piping temperature and out-
let pressure rise when the heat exchanger is
clogged, judge by measuring the outlet pres-
sure.
- Clean heat exchanger.
5
Remove obstruction.
6
Check refrigerant circuit operation state.
