Service manual

12-2
TROUBLESHOOTING
Revision Y06-02 Service Manual - KN Series
ATTENTION : check for broken or loose cable lugs first
NO SYMPTON PROBABLE CAUSE CORRECTIVE ACTION
9. Only indoor fan and
compressor working.
Outdoor fan blocked. - Remove obstructions.
10. Only indoor fan
working.
-Run capacitor of outdoor
fan motor faulty.
-Windings of outdoor fan
are shorted.
- Replace capacitor.
-Replace motor.
11. No cooling or heating
takes place, indoor
and outdoor fans
working.
- Overload safety device on
compressor is cut out (low
voltage or high
temperature)
- Compressor run capacitor
faulty.
- Compressor windings are
shorted.
- Check for proper voltage, switch off power
and try
again after one hour.
- Replace compressor capacitor.
- Replace compressor.
12.No air supply at
indoor unit,
compressor
operates.
-Indoor fan motor is blocked
or turns slowly.
-indoor fan run capacitor
faulty.
- motor windings are
shorted.
- Check voltage,repair wiring if necessary.
-Check fan wheel if it is tight enough on
motor shaft,tighten if necessary.
-Replace indoor fan motor.
13. Partial, limited air
supply at indoor
indoor unit.
Lack of refrigerant (will
accompanied by whisteling
noise) cause ice forma
tion
on indoor unit coil in cooling
mode.
-Charge the unit after localizing leak.
14. Water accumulates
and overflow from
indoor unit section.
Drain tube or spout of drain
pan clogged.
-Disasemble plastic drain tube from spout of
indoor unit drain pan.
15. Water dripping from
outdoor unit base.
(in heating mode)
Water drain outlet is
clogged.
-Open outdoor unit cover clean out water
outlet ,clean the base inside througly.
16.
Freeze-up of outdoor
coil in heating mode,
poor heating effect in
room, indoor fa
n
operates.
-Faulty outdoor thermistor.
-Faulty control cable.
- Outdoor temperature is
too low (below -10°C)
-Outdoor unit air outlet is
blocked.
-Replace thermistor.
- Repair control cable.
- Shut unit off, outdoor temp. is below design
conditions and cannot function properly.
-Remove obstructions.
CONTENT