PTAC-SVX004A-EN
35
Table 9. Malfunction Causes and Solutions
Status Cause Solution
Air Conditioner Cannot Be Started
After energizing, operation indicator is not
bright and the buzzer does not sound.
No power supply or poor connection for power
plug.
Check for power failure. If so, wait for power
recovery. If not, check power supply circuit
and ensure the power plug is complete
inserted into wall outlet.
Under normal power supply situations, the
operation indicator is not bright after
energizing. Poor connection for wiring terminals.
Check the circuit according to the circuit
diagram and properly connect the wires.
Ensure all wiring terminals are tightly
connected.
After energizing, the room circuit breakers
immediately trips OFF.
Electric short.
Ensure the unit is properly grounded. Ensure
the wires inside unit are properly connected.
Check the wiring inside the unit and whether
the insulation layer of the power cord is not
damaged. If so, replace the power cord.
After energizing, the air switch trips OFF. Improper model selection for the air switch. Select the proper air switch.
After energizing, the operation indicator is
bright while there is no display on the remote
controller or the buttons have no action. Malfunction of remote controller.
Replace the remote controller batteries.
Repair or replace the remote controller.
Air Conditioner Is Cooling Poorly
Fan motor not operating.
Fan motor malfunction.
Refer to the table section below, “Fan Motor
Does Not Operate” .
Filter blockage.
Filter is blocked. Clean the filter.
Unit is not heating or cooling properly in heat
pump mode or cool pump mode. Capillary malfunction. Replace the capillary.
Unit is not heating or cooling properly in heat
pump mode or cool pump mode. Refrigerant is leaking.
Investigate the cause of the leaks and repair.
Add any necessary refrigerant.
Compressor is not operating. Compressor malfunction.
Refer to the table section below, “Compressor
Does Not Operate” .
Electric Heater Provides Poor Heating
Electric heat elements not energizing. Heating relay on main board is damaged. Replace main board.
Electric heat element not energizing.
Wiring harness between the main board and
display board is loose. Check wiring harness connection.
Protection of temperature limiter. Air inlet blocked by objects.
Clean the filter and remove any objects
obstructing the inlet.
When turning ON the unit, the heating effect
is poor.
Malfunction of temperature limiter. Use a
universal meter to measure the two contact
points of the temperature limiter. If the
resistance value is too large, the temperature
limiter is damaged. Replace the temperature limiter.
Unit is not heating.
Fuse is burned out.
Measure resistance across fuse, If fuse is bad,
replace.
Fan Motor Does Not Operate
Wrong wire connection or a poor connection.
Check the wiring status according to the
circuit diagram.
Connect the wires according to the wiring
diagram to ensure all wiring terminals are
connected securely.
Wire harness connected to main board has a
poor connection.
Check wire harness connection.
Ensure wire harness is connected securely.
Using a universal multi-meter measure the
capacitance of the capacitor in micro farads.
If the measured capacitance is not the same
as rated capacitance the capacitor is
damaged. Fan capacitor is damaged. Replace the fan capacitor.
Compressor Does Not Operate
Wrong wire connection or a poor connection.
Check the wiring status according to the
wiring diagram.
Connect the wires according to the wiring
diagram to ensure all wiring terminals are
connected securely.
Compressor relay on main board is damaged
or the wire harness of the compressor is
loose.
Ensure the relay is functioning correctly in
cooling/heat pump mode. Replace the main board.
Compressor capacitor is damaged.
Using a universal meter measure the micro-
farad rating of the capacitor if it is not the
same as the rating listed on the capacitor it is
damaged. Replace the compressor capacitor.
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