OPERATING ISSUE
Air conditioner will not operate.
Air from unit does not feel cold
enough.
Air conditioner cooling,
but room is too warm – ice
forming on cooling coil
behind front.
Air conditioner cooling,
but room is too warm – no
ice forming on cooling coil
behind front.
Air conditioner turns on and off
rapidly.
Noise when unit is cooling.
Room too cold.
Room too hot.
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CHICAGO • ATLANTA • DALLAS • LOS ANGELES • MINNEAPOLIS • NYC/PHILA • SEATTLE • MEXICO • CANADA
PAGE 10 OF 30
TROUBLESHOOTING
CAUSES
Wall plug disconnected.
Plug current device tripped.
House fuse blown or circuit breaker tripped.
Control is off.
P1 appears in the display window.
Shut off in Heat mode.
Room Temperature lower than the set temperature
(Cool Mode).
Room Temperature higher than the set temperature
(Heat Mode).
Room temperature below 60°F (16°C).
Compressor shut off by changing modes.
Outdoor temperature below 60°F (16°C).
Air filter may be dirty.
Temperature is set too low for nighttime cooling.
Exhaust duct not connected or blocked.
Dirty air filter – air restricted.
Temperature is set too high.
Air directional louvers positioned improperly.
Front of unit is blocked by drapes, blinds or furniture,
which restrict air distribution.
Doors, windows or registers open and cold air
escapes.
Unit recently turned on in hot room.
Dirty air filter – air restricted.
Outside temperature extremely hot.
Air movement sound.
Vibration from uneven floor.
Set temperature too low.
Set temperature too high.
1-800-295-5510
RECOMMENDATIONS
Push plug firmly into wall outlet.
Press the RESET button.
Replace fuse with time-delay type or reset circuit
breaker.
Turn Control on and set to desired setting.
Drain water as described in Drainage section on
page 8.
When the air outlet exceeds 158° F (70° C), the
automatic heat protection engages. Remove any
blockages and let appliance cool down.
Reset the temperature.
Reset the temperature.
Cooling may not occur until room temperature rises
above 60°F (16°C). Reset to a lower temperature.
Wait approximately three minutes and listen for
compressor to restart when set in cool mode.
Cooling may not occur until room temperature rises
above 60°F (16°C).
Clean filter. Refer to Care and Cleaning section on
page 9. To defrost, set to fan only mode.
To defrost the coil, set to fan only mode. Then, set
temperature to a higher setting.
See Exhausting Hot Air section on page 3.
Clean air filter. Refer to Care and Cleaning section on
page 9.
Set temperature to a lower setting.
Position louvers for better air distribution.
Clear blockage in front of unit.
Close doors, windows or registers.
Allow additional time to remove stored heat from walls,
ceiling, floor and furniture.
Clean air filter.
Set fan speed to a faster setting to bring air through
cooling coils more frequently.
This is normal. If too loud, set to lower fan setting.
Move or support appliance correctly on even surface.
Increase set temperature.
Lower set temperature.
uline.com
0320 IH-8649