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Reversing
Valve
Does
Not
Shift
Defective
solenoid valve
does
not
energize.
Replace solenoid
coil
Reversing
Valve
Does
Not
Shift,
the
Valve
is Stuck.
The solenoid valve is de-energized
due
to
miswiring
at
the
unit or
thermostat--correct
wiring.
Replace
if
valve is
tight
or frozen
and
will
not
move.
Switch
from
heating to
cooling
a
few
times to loosen
valve.
Unit
does
not
cool
(Heats
only)
Dirty Air Filter
Check
filter.
Clean or
replace
if
found
dirty
Lack of
adequate
airflow
or improper
distribution of
air.
Check
the
motor
speed
and
duct
sizing.
Check
the
filter, it
should
be
inspected
every month
and changed
if dirty.
Check
for
closed registers.
Remove
or
add resistance
accordingly.
Evaporator
Blower
Motor
Tripping
Off
on
Overload
Check
for
overheated evaporator
blower
overload.
Replace motor
if
necessary.
motor
and
tripped
Evaporator
(air
coil)
ices
over
Unit
Operating
at
Too
Low
a
Room Temperature
If
room temperature drops below 65
degrees, the
evaporator may
lce
over,
Unit Not Level
or Pitched
Correctly
vertical units,
and
horizontal units
which
use
bottom
condensate
drain.
Pitch horizontal units that
use side condensate
drain.
Irvel
Water drips
from unit
Condensate
Drain Line
Kinked
or Plugged
Clean condensate
drain.
Compressor
Make
sure the
compressor is not
in
direct contact
with
the
base
or
sides
of
the
cabinet.
Cold
surroundings
can cause
liquid
slugging.
Increase
ambient
temperature.
Blower
and
Blower
Motor
Blower
wheel
hitting
the
casing. Adjust for
clearance and
alignment.
Bent
blower,
check
and
replace
if
damaged. Loose
blower
wheel on shaft, check
and
tighten.
Defective bearings,
check
and replace.
Contactors
A
clattering or humming noise
in
the
contactor could
be due
to
conffol
voltage
less
than
18
volts.
Checkforlow
supply voltage,
low
transformer output, or exffa long runs
of
thermostat wires.
Ifthe
contacts
are
pitted
or corroded
,
or
coil
is defective,
repair
or
replace.
Rattles
and
Vibrations
screws, panels,
or
internal components.
Tighten
and
secure. Copper
piping
could
be
hitting
the
metal
surfaces.
Check
for
loose
Carefully
readjust
Noisy
Operation
Water
and
Airborne
Noises
ductwork
will
cause
high
airflow
velocities
and
noisy
Excessive water through
the
water-cooled
heat
will
cause
a
squealing
sound.
Check
the
water
flow
to
ensure adequate
flow
for
good operation,
while eliminating
the
noise.
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Airflow
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