Installation guide
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Table
6
—
Troubleshooting
AMBER
LED
OPERATION
FAULT
FLASH
POSSIBLE
CAUSE
AND
ACTION
CODE
Standby
—
no
call
for
unit
operation
None
On
sole
ne
Normal
operation
Low
Stage
Cool/Heat
Operation
None
1,
pause
Normal
operation
High
Stage
Cool/Heat
Operation
None
2,
pause
Normal
operation
Brown
out
protection
is
Disabled
None
5,
pause
User
made
selection,
see
instructions
for
more
detail
Brown
out
protection
is
Active
None
6,
Pause
User
made
selection,
see
instructions
for
more
detail
System
Commu-
16
Communication
with
User
Interface
lost.
Check
wiring
to
User
Interface,
nications
Failure
indoor
and
outdoor
units
Invalid
Model
Plug
25
Control
does
not
detect
a
model
plug
or
detects
an
invalid
model
plug.
Unit
will
not
operate
without
correct
model
plug.
High
Pressure
34*
High-pressure
switch
trip.
Check
refrigerant
charge,
outdoor
fan
operation
Switch
Open
and
coils
for
airflow
restrictions.
Low
Pressure
Switch
or
Dis-
30%
Low-—pressure
switch
or
discharge
temperature
switch
trip.
Check
refrigerant
charge
Temp
charge
and
indoor
air
flow.
Switch
Open
Control
Fault
45
Outdoor
unit
control
board
has
failed.
Control
board
needs
to
be
replaced.
Line
voltage
<
187v
for
at
least
4
seconds.
Compressor
and
fan
operation
Brown
Out
(230
v)
46 not
allowed
until
voltage>190v.
Verify
line
voltage.
There
is
no
230v
at
the
contactor
when
indoor
unit
is
powered
and
cooling/
No
230v
at
Unit 47
heating
demand
exists.
Verify
the
disconnect
is
closed
and
230v
wiring
is
connected
to
the
unit.
Outdoor
Air
Temp
53
Outdoor
air
sensor
not
reading
or
out
of
range.
Chm
out
sensor
and
check
Sensor
Fault
wiring.
Outdoor
Coil
55
Coil
sensor
not
reading
or
out
of
range.
Ohm
out
sensor
and
check
wiring.
Sensor
Fault
Thermistors
out
of
56
Improper
relationship
between
coil
sensor
and
outdoor
air
sensor.
Ohm
out
range
sensors
and
check
wiring.
Compressor
operation
detected
then
disappears
while
low
stage
demand
Low
Stage
*
: : : :
71
exists.
Possible
causes
are
internal
compressor
overload
trip
or
start
relay
Thermal
Cutout
:
Cs
tet
and
capacitor
held
in
circuit
too
long
(if
installed).
:
Compressor
operation
detected
then
disappears
while
high
stage
demand
High
Stage
*
: : : :
72
exists.
Possible
causes
are
internal
compressor
overload
trip
or
start
relay
Thermal
Cutout
:
Cs
tet
and
capacitor
held
in
circuit
too
long
(if
installed).
Contactor
Shorted
73
Compressor
voltage
sensed
when
no
demand
for
compressor
operation
exists.
Contactor
may
be
stuck
closed
or
there
is
a
wiring
error.
No
230V
at
74
Compressor
voltage
not
sensed
when
compressor
should
be starting.
Con-
Compressor
tactor
may
be
stuck
open
or
there
is
a
wiring
error.
Low
Stage
Bt
Thermal
cutout
occurs
in
three
consecutive
low/high
stage
cycles.
Low
Thermal
Lockout
stage
locked
out
for
4
hours
or until
24v
power
recycled.
High
Stage
2
Thermal
cutout
occurs
in
three
consecutive
high/low
stage
cycles.
High
Thermal
Lockout
stage
locked
out
for
4
hours
or until
24v
power
recycled.
Low—Pressure
83
Low
pressure
switch
trip
has
occurred
during
3
consecutive
cycles.
Unit
Lockout
operation
locked
out
for
4
hours
or until
24v
power
recycled.
High-Pressure
BA
High
pressure
switch
trip
has
occurred
during
3
consecutive
cycles.
Unit
Lockout
operation
locked
out
for
4
hours
or until
24v
power
recycled.
¥
Sequence:
Compressor
contactor
is
de—energized
and
outdoor
fan
is
energized
for
up
to
15
minutes.
If
demand
still
exists,
control
will
energize
compressor
contactor
after
15
minute
delay.
lf
fault
is
cleared,
unit
will
resume
operation.
If
fault
still
exists,
fan
shuts
off,
and
error
code
continues
to
flash.
Control
will
attempt
re-start
every
15
minutes.
Cycling
low
voltage
defeats
the
15
minute
delay.