Airwell EDS25 Service Manual page 83

TROUBLESHOOTING
NO SYMPTON
8 No cooling or
heating only
indoor fan works.
9. Only indoor fan
and compressor
working.
10. Only indoor fan
working.
11. No cooling or
heating takes
place, indoor fans
working.
12. No air supply
at indoor unit,
compressor
operates.
13. Partial, limited air
supply at indoor
unit.
14. Water
accumulates
from indoor unit
section.
15. Water dripping
from outdoor unit
base, (in heating
mode).
16. Freeze-up of
outdoor coil in
heating mode,
poor heating effect
in room, indoor fan
operates.
17. Unit is in heat
mode but
operating in
cooling.
13-2
PROBABLE CAUSE
Outdoor fan motor faulty or
other fault caused, compressor
overload protection cut out.
Outdoor fan blocked.
-Run capacitor of outdoor fan
motor faulty.
-Windings of outdoor fan are
shorted.
-Overload safety device on
compressor is cut out (low
voltage or high temperature).
-Compressor runs capacitor
faulty.
-Compressor windings are
shorted.
-Indoor fan motor is blocked or
turns slowly.
-Indoor fan run capacitor faulty.
-Motor windings are shorted.
Lack of refrigerant (will
accompanied by whistling
noise) cause ice formation on
indoor unit coil in cooling mode.
Drain tube or spout of drain pan
clogged.
Water drain outlet is clogged.
-Faulty outdoor thermistor.
-Faulty control cable.
-Outdoor temperature is below
design conditions.
-Outdoor unit air outlet is
blocked.
-Faulty RV coil.
-RV coil is ok valve is stuck
position.
Revision
CORRECTIVE ACTION
-Replace P.C.B.
-Outdoor fan blocked remove
obstructions.
-Remove obstructions.
-Replace capacitor.
-Replace motor.
-Check for proper voltage, switch
off power and try again after one
hour.
-Replace compressor capacitor.
-Replace compressor.
-Check voltage, repair wiring if
necessary.
-Check fan wheel if it is tight
enough on motor shaft, tighten if
necessary.
-charge the unit after localizing
leak.
-Disassemble plastic drain tube
from spout of indoor unit drain pan.
-Open outdoor unit cover clean out
water outlet clean the base inside
thoroughly.
-Replace thermistor.
-Repair control cable.
-Shut unit off, it cannot work
properly.
-Remove obstructions.
-Replace RV coil.
-Replace the reversing valve.
0 Service Manual - EDS