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.
ProblemPossible CauseSolution
Unit will not turn on.? Power cord unplugged.?Ensure power cord is firmly plugged
into outlet.
? Blown fuse or tripped circuit breaker?Replace blown fuse; reset tripped.
breaker.
? Electrical power low (?brown out?). ?Low voltage protection prevents
operation if supply voltage drops
below 103.5 VAC for 115 VAC units
or 197 VAC for 208/230 VAC units.
Contact local electric utility if supply
voltage is low.
? Electrical power outage.?Contact local electric utility.
Unit does not? Dirty air filter.?Remove and clean air filter.
adequately coolNOTE: Do not operate air conditioner
(or heat) area.with filter removed.
? Room or area not sealed.?Close all doors and windows in
area. Close all air vents and
ducts in area.
? Vent Control in EXHAUST position.?Vent Control should be in NORMAL
position whenever air conditioner is
in cooling or heating mode.
? Airflow to or from unit blocked.?Remove any obstruction to airflow
from air discharge vent or return air
vent on unit.
? Unit improperly sized for room or area.?Reduce area being conditioned
(close doors or otherwise isolate
area).
? Temperature control not properly set.?Turn temperature control to more
comfortable setting.
Mounting support? Window has storm window frame.?Refer to installation instructions to
cannot be installed.determine if window frame can be
modified or if storm window frame
must be removed.
Odors in cooling.? Formation of mold, mildew, or algae ?Clean unit thoroughly.
on wet surfaces.?Place algaecide in base pan.
Odor in heating.? Caused by dust accumulation; normal?Odor will dissipate after heater
whenever heater is first used and whencycles on and off several times.
heater has not been used for a period of time.
Unit noisy.? Unit improperly installed, causing vibration?Review installation procedures.
when operating.Ensure all mounting hardware is
tight and secure.
? Water noise whenever fan runs.?Normal, especially during periods of
high humidity.
? Loose screws or parts.?Remove chassis from outer case.
Check for loose or missing screws.
Tighten or replace as required.
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ACEC
