Carrier 73KCA051D, Owner'S Manual

Page: 9 / 36

9
TROUBLESHOOTING
NOTE: If circuit breaker is tripped repeatedly, or fuse is blown more than once, contact a qualified electrician.
Wiring schematics are shown in Fig. 12 and 13.
PROBLEM CAUSE SOLUTION
UNIT DOES NOT START Unit may have become unplugged. Check that unit is securely plugged into the wall
socket.
Fuse may have blown. Replace fuse. See Note.
Circuit breaker may have tripped. Reset circuit breaker. See Note.
Unit mode may be set to OFF. Check to make sure Cooling mode is selected.
UNIT NOT PROVIDING ENOUGH
COOLING Unit airflow is blocked. Remove any curtains, blinds, or furniture that may be
blocking indoor airflow. Check outdoor airflow and
remove any blockage to outdoor airflow.
Thermostat temperature setting is too high. Reset thermostat to a lower (cooler) temperature.
Unit air filter is dirty. Remove and clean air filter.
Room was excessively hot when cooling oper-
ation started. Allow sufficient time for unit to cool room.
Compressor Overload tripped. Let fan run for approximately 10 minutes to reset
compressor overload and restart compressor.
UNIT MAKING NOISES Normal operation. Low clicking, bubbling, or whooshing noises are nor-
mal during operation of the unit.
Loose parts. Tighten loose parts.
Inadequate support. Provide additional support to unit.
UNIT ODORS Formation of mold, mildew, or algae on wet
surfaces. Run in Fan Only mode to remove condensate from
unit. Clean base pan.
WATER DRIPPING OUTSIDE Normal operation. Condensation runoff during hot and humid weather
is normal.
WATER DRIPPING INSIDE Unit is not installed at proper angle. Unit must be tilted slightly outside for proper runoff of
condensation. Check that installation is correct and
make necessary adjustments.
ICE OR FROST BUILD-UP ON COIL Unit air filter is dirty. Remove and clean air filter.
Low outside temperature. When outdoor air is approximately 65 F (18 C) or
below, frost may form when unit is in Cooling mode.
Switch unit to Fan Only mode until ice or frost melts.