AUX ASW-07B4/HSAR, Service Manual

Page: 54 / 159

Blocked caused by water or
impurity
Operating current is lower
than rated current, part of
the unit frosts heavily
use high pressure N
2
to
clean out the block,
revacuumize and recharge
R407C
Damaged compressor, high
start current
Check the windings and
insulation of compressor
and if it is locked
Replace the compressor
3.6 The units blow out cool air when in heating mode
Reason Check to be made Proposed Remedy
Four-way valve doesn’t
work Listen to the units if there
is sounds of valve’s
working when heating or
cooling Replace the valve
Faults of control interrupter
or other relevant circuits of
the valve Check the circuit Repair or replace the
control board
Insufficient R407C causes
the insufficient heating
capacity Little condensation water
on outdoor air intake pipe,
low operating current Add R407C
Connexity of compressor Same temp of air intake
inlet and discharge outlet
of the compressor, no
condensation in air intake
inlet Replace the compressor
3.7 The units doesn’t work
Reason Check to be made Proposed Remedy
Bad connection of the
power plugs, or no power
plug
Check the socket Repair or replace
Outdoor fuse or indoor fuse
is burnt
Check if the fuse is good Replace the fuse
Low voltage Measure the voltage
Heighten the voltage of
the power supply system
Wrong indoor temp set
Measure actual indoor
temp, compare to the set
temp(in cooling set temp
should be lower than the
actual, in heating, is
higher)
Reset the temp