Service manual

51 Room Air Conditioner
Troubleshooting Guide
Poor cooling (heating) effect
Filters of indoor unit are blocked
Clean the filters regularly
Heat exchanger of outdoor unit is blocked
Clean the dust accumulated on the
surface of the heat exchanger
Leakage occurs between high and low pressure
inside compressor
Replace the compressor
Partial blockage of capillary
Replace the capillary
Leakage of refrigerant
Find out the leakage and charge refrigerant
Blockage in one-way valve of outdoor unit
Replace one-way valve
When unit is
cooling or heating,
both compressor
and outdoor fan
don't run
Abnormal transformer output
Replace the transformer
Damage of main control board
Replace the main control board
Improper setting of temperature
Adjust the set temperature
Replace the fan motor
Breakage of outdoor fan
When unit is
cooling or heating,
the compressor
runs but outdoor
fan doesn't run
Wrong wire connection Wire according to the circuit diagram
Breakage of outdoor fan motor capacitor
Replace the fan motor capacitor
When cooling or
heating, outdoor
fan runs, but
compressor
doesn't run.
Malfunction of compressor
Replace the compressor
Poor contact of connection between the
main control board and module
Re-fasten the connection
Abnormal input of power module
Check if input is 320V. If not, replace the
rectifier
Abnormal output of power module
Replace the power module
Abnormal power supply of outdoor unit Check the circuit according to circuit diagram
Damage of main control board
Replace the main control board
Air filters are blocked
Clean the filter
Fan speed was set too slow
Set the fan speed to high or
medium speed
Air circulation
is insufficient