9-4-2. Poor cooling or heating.
9-4-3. Excessive cooling or heating.
NO
NO
• Set temperature is suitable.
Set temperature to higher or
lower value using temperature
setting buttons of the remote
control unit.
• Remote control unit is placed where
it can detect room temperature
properly.
Change position of remote
control unit.
Air filter is clogged.
NO
YES
Temperature
difference
is small.
YES
Temperature difference between
suction and discharge air is
large enough (approx. 10 deg. or more).
Possibility of
gas shortage.
YES
• Check position of remote control unit.
Cool or warm air from air conditioner
reaches position directly.
•
Change position of remote
control unit.
• Wide and narrow tubes between
indoor unit and outdoor unit are
insulated.
Insulate both wide and narrow
tubes separately and then
tape together.
• Measure temperature of suction and
discharge air of air conditioner.
Charge refrigerant
gas (R22).
Check for clogging of air filter.
• Fan speed is set to LOW.
Clean filter.
Set fan speed to either
HIGH or MEDIUM.
• Review cooling load estimate,
if performance of air conditioner is
normal.
Reduce cooling or heating
load or replace the air
conditioner with larger
capacity.
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