(2) General Troubleshooting Flow Chart: Diagnosis and Remedy
When you have found a major problem, such as refrigerant not flowing in the system or reduced air circulation,
come to this section and find the box listing the problem.
Connected to the box are the main causes of the problem and their remedies. To find out which malfunction is
happening in your case, check the remote controller for an Alarm Message, and follow the steps in section 3).
(A)
Cooling
Poor cooling
Is setting temp.
suitable ?
Change the setting temp.
Is cooling load
too heavy ?
Review cooling load
estimate.
4-way valve is
defective.
Replace the 4-way valve.
Refrigerant
shortage
Charge refrigerant gas.
Refrigerant flow
failure
Electronic refrigerant
control valve is defective.
Service valves are not
fully open.
Replace the compressor.
Compressor is defective.
Open the valves fully.
Air filter
is clogged.
Clean the filter.
Not enough air
circulation
Is fan speed
set to LOW ?
Set the fan speed to
either MEDIUM or HIGH.
Refrigerant tubes between
indoor and outdoor units
are not insulated.
Insulate wide and narrow
tubes separately.
Replace the valve.
a. Cooling
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