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PROBLEM POSSIBLE CAUSE TO CORRECT
Thermostat short
cycles.
Thermostat differential too
narrow.
Plenum gasket not sealing,
allowing discharge air to short
cycle the thermostat.
Restricted coil or dirty filter.
Thermostat bulb touching
thermostat bulb support bracket.
Replace thermostat.
Check gasket, reposition or replace.
Clean and advise customer of periodic cleaning of filter.
Adjust bulb bracket.
(Applicable models.)
PROBLEM POSSIBLE CAUSE TO CORRECT
Prolonged off cycles
(automatic operation).
Anticipator (resistor) wire
disconnected at thermostat or
system switch.
Anticipator (resistor shorted or
open).
(Applicable models.)
Partial loss of charge in thermo-
stat bulb causing a wide differ-
ential.
Refer to appropriate wiring diagram.
Replace thermostat block and resistor.
Replace thermostat.
PROBLEM POSSIBLE CAUSE TO CORRECT
Thermostat sticking.
Incorrect wiring.
Change room thermostat.
Refer to appropriate wiring diagram.
Switches from cooling
to heating.
PROBLEM POSSIBLE CAUSE TO CORRECT
Evaporator drain pan cracked or
obstructed.
Water in compressor area.
Obstructed condenser coil.
Fan blade and slinger ring
improperly positioned.
Repair, clean or replace as required.
Detach shroud from pan and coil. Clean and remove old
sealer. Reseal, reinstall and check.
Steam clean.
Adjust fan blade 3/16 to 1/4" from condenser shroud.
Adjust fan motor mount to allow 3/16 to 1/4" clearance
between condenser fan blade and base pan.
Outside water leaks.
PROBLEM POSSIBLE CAUSE TO CORRECT
High indoor humidity.
Insufficient air circulation in air
conditioned area.
Oversized unit.
Inadequate vapor barrier in
building structure, particularly
floors.
Adjust louvers for best possible air circulation.
Operate in "Fan-Auto (Moneysaver)" position.
Advise customer.