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PROBLEM POSSIBLE CAUSE TO CORRECT
Fuse blown or circuit tripped. Replace fuse, reset breaker. If repeats,
check fuse or breaker size. Check for shorts
in unit wiring and components.
Power cord not plugged in. Set switch correctly.
System switch in "Off" position. Test for continuity in each switch position.
Inoperative system switch. Check wiring and connections.
Unit does
not run.
Loose or disconnected wiring at
switch or other components.
Reconnect per wiring diagram.
Thermostat contacts stuck. Replace thermostat.
Thermostat set at coldest point. Turn to higher temperature setting to see if
the unit cycles off.
Incorrect wiring. Refer to appropriate wiring diagram.
Thermostat
does not
turn unit off.
Unit undersized for area to be
cooled.
Refer to Sizing Chart.
Dirty filter. Clean as recommended in Owner’s Manual.
Restricted air flow. Check for dirty or obstructed coil - clean as
required or remove obsticales.
Inoperative thermostat. Test for shorted thermostat or stuck
contacts.
Short of refrigerant. De-ice coil and check for leak.
Inoperative fan motor. Test fan motor and replace if inoperative.
Evaporator
coil freezes
up.
Partially restricted capillary. De-ice coil. Check temperature differential
across coil. Touch test coil return bends for
same temperature. Test for low running
current.
Excessive heat load. Unit undersized. Test cooling performance
of unit. Replace with larger unit.
Restriction in line. Check for partially iced coil. Check
temperature split across coil.
Refrigerant leak. Check for oil at silver soldered connections.
Check for partially iced coil. Check split across
coil. Check for low running amperage.
Thermostat contacts stuck Check operation of thermostat. Replace if
contacts remain closed.
Compressor
runs
continually,
does not
cycle off.
Thermostat incorrectly wired. Refer to appropriate wiring diagram.
Service Manual
Room Air Conditioner with R-410A
Heat Controller, Inc.
31