Friedrich Kuhl KCS12B10A Service Manual page 55

Tips continued
COMPLAINT
Unit Does Not Cool/ Heat
Room Sufficiently, or Cycles
On And Off Too Frequently
(continued).
Unit Runs Too Much.
Compressor does not run.
55
TROUBLESHOOTING
CAUSE
Operating in Cooling mode while the
outside temperature is below 60 °F
(16 °C).
The digital control is set to fan cycling
mode.
The air conditioner has insufficient cool-
ing capacity to match the heat gain of
the room.
The air conditioner has insufficient
heating capacity to match the heat loss
of the room.
This may be due to an excessive heat
load in the room.
It may also be due to an improperly sized
unit.
Low voltage
Temperature not set cold enough or
room air thermistor inoperative
Compressor hums but cuts off on over-
load
Open overload
Open capacitor
Inoperative power button
Broken, loose or incorrect wiring
SOLUTION
Do not try to operate your air conditioner in the cooling mode
when the outside temperature is below 60 °F (16 °C). The unit
will not cool properly, and the unit may be damaged.
Since the fan does not circulate the room air continuously
at this setting, the room air does not mix as well and hot (or
cold) spots may result. Using the continuous fan setting is
recommended to obtain optimum comfort levels.
Check the cooling capacity of your unit to ensure it is properly
sized for the room in which it is installed. Room air condition-
ers are not designed to cool multiple rooms.
Check the heating capacity of your unit. Air conditioners are
sized to meet the cooling load, and heater size is then se-
lected to meet the heating load. In extreme northern climates,
room air conditioners may not be able to be used as a primary
source of heat.
If there are heat producing appliances in use in the room, or if
the room is heavily occupied, the unit will need to run longer to
remove the additional heat.
Be sure to use exhaust vent fans while cooking or bathing and,
if possible, try not to use heat producing appliances during the
hottest part of the day.
Check voltage at compressor. 115V & 230V units will operate
at 10% voltage variance
Set temperature to lower than ambient position. Test thermis-
tor and replace if inoperative.
Direct test compressor.
Test overload protector & replace if inoperative
Test capacitor & replace if inoperative
Test for continuity in all positions. Replace User Interface if
switch inoperative.
Refer to appropriate wiring diagrams to check wiring. Correct
as needed.