11
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.
Problem Possible Cause Solution
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 cool NOTE: 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 when cycles 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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