Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
70
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:
solenoid valve failure
if the cooling load too large
if set temp. is proper
compressor failure
refrigerant flow
malfunction
bad cooling
lack of refrigerant
4-way valve failure
check the evaluation of
cooling load
change 4-way valve
recharge refrigerant
change the solenoid valve
change the set temp.
change compressor
bad ventilation
if fan is set as low speed set the fan as med speed
if air inlet filter is blocked clean the filter
if the refrigerant pipe between
I.D and O.D is insulated
insulate the thick pipe
and slim pipe separately
Figure 1
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