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XII.
TROUBLESHOOTING GUIDE FOR UNIT OPERATION
Blown
Fuse/Tripped
Circuit
Breaker
Replace
fuse
or
reset
circuit breaker.
(Check
for
correct
size
fuse
and
circuit
breaker.)
Blown
Fuse on
Controller
Replace fuse
on
controller.
(Check
for
correct
size
fuse.)
Broken or Loose
Wires
Replace
or
tighten
the
wires
Voltage
Supply
Low
If
voltage
is
below minimum
voltage
on data
plate, contact
local
power company.
Low
Voltage
Circuit
Check24 volt
ffansformer
for
burnout or voltage
less
than
18
volts.
Thermostat
Set
thermostat on
"Cool"
and
lowest temperature setting,
unit
should
run.
Set
thermostat on
"Heat"
and
highest temperature
setting,
unit
should
run. If
unit
does
not run in both
cases,
the
thermostat could
be
wired incorrectly
or
be
faulty.
To
prove
faulty
or
miswired
thermostat, disconnect thermostat wires
at the
unit
and
jumper
between
"R", "Y",
and
"G"
terminals
and
unit
should
run.
Replace thermostat
with
correct
heat
pump thermostat
only
A
substitute may not
work
properly.
Entire
unit
does
not run
Interruptible
Power
Check
incoming
supply voltage
Thermostat
Check setting,
calibration,
and
wiring.
If
thermostat
has
an
anticipator,
set
it
at
1.0
or I.2.
Wiring
Check
for
loose or broken wires
at
compressor, capacitor,
or
contactor.
Blown
Fuse
Replace
fuse
or
reset
circuit breaker.
(Check
for
correct
size
fuse or
circuit
breaker.)
High
or
Low
Pressure
Controls
The
unit
could
be
off
on the
high
or
low
pressure
cutout control.
Check water
GPM,
air
CFM
and
filter,
ambient temperature
and
loss
of refrigerant.
If
the
unit still fails
to run, check
for faulty
pressure
controls
individually.
Replace
if
defective.
Defective Capacitor
Check
capacitor.
If
defective; remove, replace,
and
rewire
correctly
Voltage
Supply
Low
If
voltage
is
below minimum
voltage specified
on the data
plate,
contact local power
company.
Check voltage
at
compressor
for
possible
open
terminal.
Low Voltage
Circuit
Chec,k24
volt
transformer
for
burnout or voltage
less
than
18
volts. With
a
voltmeter, check signal
from
thermostat
at
Y
to
X,
M1
on
controller
to
X,
and the
capacitor voltage
drop.
Replace
component that
does
not
energize.
Compressor Overload
Open
In all
cases
an
"internal"
compressor overload is
used.
If
the
compressor motor is too hot,
the
overload
will
not
reset
until
the
compressor cools
down.
If
the compressor is cool
and the
overload
does
not
reset, there
may be
a
defective or
open
overload.
Replace the compressor.
Compressor
Motor
Grounded
Internal winding
grounded to
the
compressor
shell.
Replace
the
compressor.
If
compressor
burnout occurs,
install
filter
drier
at
suction
line.
Compressor
Windings
Open
Check
continuity
or
the
compressor windings
with
an
ohmmeter
If
the
windings
are open, replace the compressor.
Blower motor
runs
but
compressor
does
not,
or
compressor
short cycles.
Seized
Compressor
Try
an
auxiliary
capacitor in
parallel with
the
run capacitor
momentarily.
If
the
compressor
still
does
not
start, replace
it.
Thermostat
The
differential
is
set
too
close
to
the
thermostat.
Readjust
heat
anticipator
to
1.0
or
1.2.
Unit
Short
Cycles
Thermostat
Improperly
located thermostat
(e.g. near
kitchen),
inaccurately
sensing the
comfort
level
in
the
living
area.
13
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