–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 insuf-
ficient.
(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.
