3.4 Frequently switch on/off of the compressor
Reason
Check to be made
Proposed remedy
Running voltage is too low
Measure the voltage
Add measures of v
oltage
stabilization
Discharge temp is to
o hig h
caused
by
insufficient
of
R407C, compressor is protected
by overheat
Check condensation of air
intake pipe or measure if
operating current is lower than
rated current
Check leakage point, welding
or add R410A
Temp sensor is too close to
evaporator or moved
Check the position of sensor
Adjust the position or replace
the sensor
Air inlet/outlet of heat exchange
is blocked or low speed of fan
motor; indoor air filter is too
dirty or blocked
Check
indoor/outdoor
heat
exchange, speed of motor, air
inlet/outlet
Cleanup the filter, remove the
obstacle
Too much R410A
Too much condensation water
on air intake pipe, hig h
operating current
Discharge a little R410A
Bad insulation of compressor,
high
operating
current,
overcurrent proof
Check
start
or
operating
current
Replace compressor
Improper temp set
Check actual ambient temp
Reset
3.5 Promptly protected by halt after compressor starts
Reason
Check to be made
Proposed Remedy
Insufficient R410A
Little or no condensation water
on air intake pipe, op erating
current is lower than rated
current
Add R410A
Mixed with air in the system,
vacuum is not good
Power varies when running
Vacuumize
the s
ystem,
recharge R410A
Blocked caused by water or
impurity
Operating current is lower than
rated current, part of th e unit
frosts heavily
use high pressure N
2
to clean
out the block, revacuumize
and recharge R410A
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 doesnít work
Listen to the units if t here is
sounds of valveís w orking
when heating or cooling
Replace the valve
Faults of control inte rrupter or
other relevant circuits of the
valve
Check the circuit
Repair or replace the c ontrol
board
Insufficient R410A causes the
insufficient heating capacity
Little condensation water on
outdoor air intake pipe, low
operating current
Add R410A
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