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Troubleshooting
The following table describes some common problems that may be encountered with a room air conditioner. Each
problem is accompanied by several possible causes and solutions.
Possible Cause
• Power cord unplugged.
• Blown fuse or tripped breaker.
• Electrical power low ("brown out").
Problem
Unit will not turn on.
Unit repeatedly blows
fuse or trips breaker.
Unit does not
adequately cool room
or area.
• Electrical power outage.
• Compressor in 3-minute lock-out.
• Other devices sharing circuit results in
circuit overload.
• Incorrectfuse size or type.
• Incorrect circuit breaker size.
• Extension cord used to provide power.
• Dirtyair filter.
• Optional charcoal air filter (if used) clogged.
• Room or area not sealed.
• Vent Control in EXHAUST position.
• Airflow to or from unit blocked.
• Unit impropedy sized for room or area.
Solution
• Ensure power cord is firmly plugged
intooutlet.
• Replace blown fuse; reset tdpped
breaker.
• Low voltage protection prevents
operation ifsupply voltage drops
below 90 VAC for 115 volt units;
171 VAC for 230 volt units. Contact
local electric utilityif voltage is low.
• Contact local electric utility.
• Wait 3 minutes for compressor start.
• Disconnect other devices or move
devices to different circuit.
NOTE: Air conditioners labeled "Use
on Single Outlet Circuit Only" require
separate, dedicated, circuit.
• Ensure fuse is correct size. Unit
requires time-delay fuses.
• Ensure circuit breaker is correct size.
• Do not use an extension cord with
this air conditioner. If power cord on
air conditioner does not reach outlet
have qualified electrician move out-
let or install new outlet closer to unit.
• Remove and clean air filter.
NOTE: Do not operate air conditioner
with filter removed.
• Replace charcoal filter (if desired).
NOTE: Optional charcoal filter can-
not be cleaned. Filter must be
replaced after three months use.
• Close all doors and windows in
cooling area. Close all air vents and
ducts in area.
• Vent Control should be in CLOSED
position whenever air conditioner is
in cooling mode.
• Remove any obstruction to airflow
from air discharge vent or return air
vent on unit.
• Reduce cooling area (close doors or
otherwise isolate area).
NOTE: See Sizing Instructions
for information on correctly sizing
room air conditioners.