-- 11 --
Ⅷ
. Troubleshooting
PROBLEM
CAUSE
CHECKUP
SOLUTION
No air output
Power cut off.
Power cable problem
Lack phase
Check voltage with multimeter
Repair power supply
and, electric circuit
Overload in fan motor
Check if the current of fan motor
exceeds the rated limit
Adjust the distance
between air outlet
and barrier. Clean
air filter.
Fan motor burnt
Use megameter to measure the
ground resistance of coil. Use
multimeter to measure the winding
resistance
Replace fan motor
Failure in
startup of
compressor
Power cut off.
Power cable problem
Lack phase
Check voltage with multimeter
Repair power supply
and, electric circuit
Thermal relay overload
Check whether the thermal relay is
disconnected
Check the cause of
overload and reset
the thermal relay
after elimination
Loose contact in contact or coil burnt
Check the contacts
Repair or replace
Winding coil burnt or short circuit in
motor
Use megameter to measure the
insulation between the phases. Use
multimeter to measure the winding
resistance.
Repair or replace
compressor
Too low a voltage
Buzzing in motor. Use multimeter to
measure winding resistance.
Increase the voltage
to its rated limit
Compressor
stop running
when the
machine
working
（
High and Low
Voltage
Controller
）
Low
Voltage Action
Filter blocked
Condensation or frosting on filter
Replace
Dirty or ice
block at inlet of
thermal
expansion valve
Serious frost formation in thermal
expansion valve body.
Dirty clogging, frosting of the whole
valve body.
Ice jammed, frost on the back half of
the valve body.
Dirty Blockage:
Remove Thermal
Expansion Valve for
Cleaning
Ice Block: Replace
Drying Filter and
Run
Professionals are
required.
