Diagnostic Information (Troubleshooting) - Haier HCFU-42CF03 Service Manual

10. Diagnostic information (troubleshooting)

10.1 System failure
If the refrigerant in the system cannot flow fluently or the airflow circles more slowly, please check due
to the following procedures.
Cooling:
bad cooling
refrigerant flow
malfunction
bad ventilation
41
Commercial Air Conditioner
if set temp. is proper
if the cooling load too large
4-way valve failure
lack of refrigerant
solenoid valve failure
compressor failure
if fan is set as low speed
if air inlet filter is blocked
if the refrigerant pipe between
I.D and O.D is insulated
Figure 1
Model: HCFU-42CF03
HCFU-42HF03
change the set temp.
check the evaluation of
cooling load
change 4-way valve
recharge refrigerant
change the solenoid valve
change compressor
set the fan as med speed
clean the filter
insulate the thick pipe
and slim pipe separately