General Troubleshooting Flow Chart: Diagnosis And Remedy - Sanyo KH2442 / CH2442 Service Manual

(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
Section
a. Cooling
Poor cooling
1
2
3
4
Refrigerant flow
failure
Not enough air
circulation
Is setting temp.
suitable ?
Is cooling load
too heavy ?
4-way valve is
defective.
Refrigerant
shortage
Electronic refrigerant
control valve is defective.
Compressor is defective.
Service valves are not
fully open.
Air filter
is clogged.
Is fan speed
set to LOW ?
Refrigerant tubes between
indoor and outdoor units
are not insulated.
IV - 4
4. Service procedures
Change the setting temp.
Review cooling load
estimate.
Replace the 4-way valve.
Charge refrigerant gas.
Replace the valve.
Replace the compressor.
Open the valves fully.
Clean the filter.
Set the fan speed to
either MEDIUM or HIGH.
Insulate wide and narrow
tubes separately.
0458_M_I
SM830082