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140 PB
TROUBLESHOOTING
Troubleshooting for Malfunction without Active Error Code
Possible Causes Discriminating Method (Air conditioner Status) Troubleshooting
Air Conditioner will not start up
No power supply, or poor connection for power
plug
After energization, operation indicator isn’t
bright and the buzzer can't give out sound
Confirm whether it's due to power failure.
If yes, wait for power recovery. If not, check
power supply circuit and make sure the power
plug is connected well.
"Wrong wire connection between indoor unit
and outdoor unit,
or poor connection for wiring terminals"
Under normal power supply circumstances,
operation indicator isn't bright after energiza‑
tion
Check the circuit according to circuit diagram
and connect wires correctly. Make sure all wir‑
ing terminals are connected firmly
Electric leakage for air conditioner After energization, room circuit breaker trips
off at once
"Make sure the air conditioner is grounded
reliably
Make sure wires of air conditioner is connected
correctly
Check the wiring inside air conditioner. Check
whether the insulation layer of power cord is
damaged; if yes, place the power cord."
Model selection for air switch is improper After energization, air switch trips off Select proper air switch
Malfunction of remote controller After energization, operation indicator is bright,
while no display on remote controller or but‑
tons have no action.
Replace batteries for remote controller Repair
or replace remote controller
Poor Cooling (Heating) for Air Conditioner
Set temperature is improper Observe the set temperature on remote
controller
Adjust the set temperature
Rotation speed of the IDU fan motor is set too
low
Small wind blow Set the fan speed at high or medium
Filter of indoor unit is blocked Check the filter to see it's blocked Clean the filter
Installation position for indoor unit and outdoor
unit is improper
Check whether the installation postion is
proper according to installation requirement
for air conditioner
Adjust the installation position, and install the
rainproof and sunproof for outdoor unit
Refrigerant is leaking Discharged air temperature during cooling is
higher than normal discharged wind tem‑
perature; Discharged air temperature during
heating is lower than normal discharged wind
temperature; Unit's pressure is much lower
than regulated range
Find out the leakage causes and deal with it.
Add refrigerant.
Malfunction of 4‑way valve Blow cold wind during heating Replace the 4‑way valve
Malfunction of capillary Discharged air temperature during cooling is
higher than normal discharged wind tem‑
perature; Discharged air temperature during
heating is lower than normal discharged wind
temperature; Unit't pressure is much lower
than regulated range. If refrigerant isn’t leak‑
ing, part of capillary is blocked
Replace the capillary
Flow volume of valve is insufficient The pressure of valves is much lower than that
stated in the specification
Open the valve completely
Malfunction of horizontal louver Horizontal louver can’t swing Refer to point 3 of maintenance method for
details
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