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9-4-1. Poor cooling.
9-4-2. Excessive cooling.
No
Yes
Yes
Yes
If temperature difference
is small, possibility of
gas shortage.
No
Change position of remote
control unit.
Are wide and narrow tubes between
indoor unit and outdoor unit
insulated ?
Insulate both wide and narrow
tubes separately and then
tape together.
Measure temperature of suction and
discharge air of air conditioner.
Check for clogging of air filter.
Is fan speed set to LOW ?
Set fan speed to either
HIGH or MEDIUM.
If performance of air conditioner is
normal, review cooling load estimate.
Reduce cooling load or
replace the air conditioner
with larger capacity.
No
No
Is set temperature suitable ?
Set temperature to higher
value using temperature
setting buttons of the remote
control unit.
Is remote control unit placed where
it can detect room temperature
properly ?
Is remote control unit placed where
it can detect room temperature
properly ?
Change position of remote
control unit.
Is temperature difference between
suction and discharge air large enough ?
(approx. 10 deg. or more).
If air filter is clogged,
clean the filter.
9-4. Air conditioner operates, but abnormalities are observed.
Charge refrigerant
gas (R22).
50