Friedrich Q Series Service & Parts Manual page 61

TROUBLESHOOTING
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.
61
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
Figure 711 (Troubleshooting Tips)
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 prop-
erly, 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 rec-
ommended 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 in-
stalled. Room air conditioners are not designed
to cool multiple rooms.
Check the heating capacity of your unit. Air con-
ditioners are sized to meet the cooling load, and
heater size is then selected 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 units will
operate at 10% voltage variance
Set temperature to lower than ambient position.
Test thermistor 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.