13-2
TROUBLESHOOTING
Revision Y05-01
Service Manual - ALPHA
NO
SYMPTON
PROBABLE CAUSE
CORRECTIVE ACTION
8
No cooling or
heating only
indoor fan works.
Outdoor fan motor faulty or
other fault caused, compressor
overload protection cut out.
-Replace P.C.B.
-Outdoor fan blocked remove
obstructions.
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 fans
working.
-Overload safety device on
compressor is cut out (low
voltage or high temperature).
-Compressor runs 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.
13.
Partial, limited air
supply at indoor
unit.
Lack of refrigerant (will
accompanied by whistling
noise) cause ice formation on
indoor unit coil in cooling mode.
-charge the unit after localizing
leak.
14.
Water
accumulates
and over flow
from indoor unit
section.
Drain tube or spout of drain pan
clogged.
-Disassemble 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
thoroughly.
16.
Freeze-up of
outdoor coil in
heating mode,
poor heating effect
in room, indoor fan
operates.
-Faulty outdoor thermistor.
-Faulty control cable.
-Outdoor temperature is below
design conditions.
-Outdoor unit air outlet is
blocked.
-Replace thermistor.
-Repair control cable.
-Shut unit off, it cannot work
properly.
-Remove obstructions.
17.
Unit is in heat
mode but
operating in
cooling.
-Faulty RV coil.
-RV coil is ok valve is stuck
position.
-Replace RV coil.
-Replace the reversing valve.
