Before You Call For Service; Abnormal Operation - NEC RC75 Owner's Manual

Room air conditioners
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Before you call for service...

Troubleshooting Tips
Save time and money! Review the chart below first and
you may not need to call for service.
Normal Operating
• You may hear a pinging noise caused by water being picked up and thrown against the condenser
on rainy days or when the humidity is high. This design feature helps remove moisture and improve
• You may hear the thermostat click when the compressor cycles on and off.
• Water will collect in the base pan during high humidity or on rainy days. The water may overflow
and drip from the outdoor side of the unit.
• The fan may run even when the compressor does not.

Abnormal Operation

Air conditioner
does not start
Air conditioner
does not cool as it
Air conditioner
freezing up
Possible Causes
The air conditioner is
The fuse is blown/circuit
breaker is tripped.
Power failure.
Airflow is restricted.
not be set high enough.
The air filter is dirty.
The room may have been
Cold air is escaping.
Cooling coils have iced up.
Ice blocks the air flow and
stops the air conditioner
from cooling the room.
What To Do
• Make sure the air conditioner plug is pushed
completely into the outlet.
• Check the house fuse/circuit breaker box and
replace the fuse or reset the breaker.
• If power failure occurs, turn the mode control to OFF.
When power is restored, wait 3 minutes to restart the
air conditioner to prevent tripping of the compressor
• Make sure there are no curtains, blinds, or furniture
blocking the front of the air conditioner.
• Turn the knob to a higher number. The highest
setting provides maximum cooling.
• Clean the filter at least every 2 weeks.
See the operating instructions section.
• When the air conditioner is first turned on you need
to allow time for the room to cool down.
• Check for open furnace floor registers and cold air
• Set the air conditioner's vent to the closed position.
• See Air Conditioner Freezing Up below.
• Set the mode control at LOW fan or HIGH cool with
the thermostat at 1 or 2.

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