Troubleshooting For Normal Malfunction; Air Conditioner Can't Be Started Up; Poor Cooling (Heating) For Air Conditioner - Tadiran Telecom SMVH09A-2A1B1NA Service Manual

Troubleshooting

9.3 Troubleshooting for Normal Malfunction

1. Air Conditioner Can't be Started Up

Possible Causes
No power supply, or poor
connection for power plug
Wrong wire connection
between indoor unit and
outdoor unit, or poor
connection for wiring
terminals
Electric leakage for air
conditioner
Model selection for air switch
is improper
Malfunction of remote
controller

2. Poor Cooling (Heating) for Air Conditioner

Possible Causes
Set temperature is improper
Rotation speed of the IDU fan
motor is set too low
Filter of indoor unit is blocked Check the filter to see it's blocked
Installation position for indoor
unit and outdoor unit is
improper
Refrigerant is leaking
Malfunction of 4-way valve
Malfunction of capillary
Flow volume of valve is
insufficient
Malfunction of horizontal
louver
Malfunction of the IDU fan
motor
Malfunction of the ODU fan
motor
Malfunction of compressor
3. Horizontal Louver Can't Swing
Possible Causes
Wrong wire connection, or
poor connection
Stepping motor is damaged
Main board is damaged
52
Discriminating Method (Air conditioner Status)
After energization, operation indicator isn't bright
and the buzzer can't give out sound
Under normal power supply circumstances,
operation indicator isn't bright after energization
After energization, room circuit breaker trips off
at once
After energization, air switch trips off
After energization, operation indicator is bright,
while no display on remote controller or buttons
have no action
Discriminating Method (Air conditioner Status)
Observe the set temperature on remote controller
Small wind blow
Check whether the installation postion is proper
according to installation requirement for air conditioner
Discharged air temperature during cooling is higher
than normal discharged wind temperature; Discharged
air temperature during heating is lower than normal
discharged wind temperature; Unit's pressure is much
lower than regulated range
Blow cold wind during heating
Discharged air temperature during cooling is higher
than normal discharged wind temperature; 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 leaking,
part of capillary is blocked
The pressure of valves is much lower than that stated
in the specificatio
Horizontal louver can't swing
The IDU fan motor can't operate
The ODU fan motor can't operate
Compressor can't operate
Discriminating Method (Air conditioner Status)
Check the wiring status according to circuit
diagram
Stepping motor can't operate
Others are all normal, while horizontal louver can't
operate
Troubleshooting
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.
Check the circuit according to circuit diagram
and connect wires correctly. Make sure all wiring
terminals are connected firml
Make sure the air conditioner is grounded
reliablyMake 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
Select proper air switch
Replace batteries for remote controller
Repair or replace remote controller
Troubleshooting
Adjust the set temperature
Set the fan speed at high or medium
Clean the filte
Adjust the installation position, and install
the rainproof and sunproof for outdoor
unit
Find out the leakage causes and deal
with it. Add refrigerant.
Replace the 4-way valve
Replace the capillary
Open the valve completely
Refer to point 3 of maintenance method
for details
Refer to troubleshooting for H6 for
maintenance method in details
Refer to point 4 of maintenance method
for details
Refer to point 5 of maintenance method
for details
Troubleshooting
Connect wires according to wiring diagram to
make sure all wiring terminals are connected
firml
Repair or replace stepping motor
Replace the main board with the same model