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506518−01
Outdoor A175 Main
Control LEDs
Clearing Status
Solution
Possible
Cause(s)
Condition
icomfort
Toucht
Thermostat
Display
DS15
Yellow
Clearing Status
Solution
Possible
Cause(s)
Condition
icomfort
Toucht
Thermostat
Display
DS13
Red
3 Flashes
then
Pause
OFF
Moderate
Alert Code
403
Short Cycling
Compressor is
running less than
three minutes.
1
Thermostat demand signal is intermittent.
2
Time delay relay or A175 Main Control is
defective.
3
If high pressure switch is present, see
Flash Code 2 information.
Clears after four
consecutive normal
compressor run cycles,
or after power reset.
4 Flashes
then
Pause.
OFF
Critical Alert
Code 404
Locked Rotor
Compressor has
a locked out due
to run capacitor
short, bearings
are seized, ex-
cessive liquid re-
frigerant.
1
Run capacitor has failed.
2
Low line voltage (contact utility if voltage
at disconnect is low).
S Check wiring connections
3
Excessive liquid refrigerant in the com-
pressor.
4
Compressor bearings are seized.
Clears after power reset
or four normal
compressor cycles.
5 Flashes
then
Pause
OFF
Critical Alert
Code 405
Open Circuit
Compressor has
an open circuit
due to power dis-
connection, fuse
is open or other
similar conditions.
1
Outdoor unit power disconnect is open.
2
Unit circuit breaker or fuse(s) is open.
3
Unit contactor has failed to close.
S Check compressor contactor wiring
and connectors
S Check for compressor contactor fail-
ure (burned, pitted or open)
S Check wiring and connectors between
supply and compressor
S Check for low pilot voltage at com-
pressor contactor coil
4
High pressure switch is open and requires
manual reset.
5
Open circuit in compressor supply wiring
or connections.
6
Unusually long compressor protector reset
time due to extreme ambient temperature.
7
Compressor windings are damaged.
S Check compressor motor winding re-
sistance
Clears after one normal
compressor run cycle or
power reset.
6 Flashes
then
Pause
OFF
Critical Alert
Code 406
Open Start
Circuit
Current not
sensed by Start
transformer.
1
Run capacitor has failed.
2
Open circuit in compressor start wiring or
connections.
S Check wiring and connectors between
supply and the compressor S terminal
3
Compressor start winding is damaged.
S Check compressor motor winding re-
sistance
Clears when amperage
is detected in RUN and
START sensors, or after
power reset.
7 Flashes
then
Pause
OFF
Critical Alert
Code 407
Open Run
Circuit
Current not
sensed by run
transformer.
1
Open circuit in compressor start wiring or
connections.
S Check wiring and connectors between
supply and the compressor R terminal
2
Compressor start winding is damaged.
S Check compressor motor winding re-
sistance
Clears when amperage
is detected in RUN and
START sensors, or after
power reset.
8 Flashes
then
Pause
OFF
Critical Alert
Code 408
Welded
Contactor
Compressor
always runs
1
Compressor contactor failed to open.
2
Thermostat demand signal not connected
to module.
Clears after one normal
compressor run cycle or
after power reset.
9 Flashes
then
Pause
OFF
Moderate/
Critical Alert
Code 409
Secondary
Low Voltage
24VAC is below
18VAC.
1
Control circuit transformer is overloaded.
2
Low line voltage (contact utility if voltage
at disconnect is low).
S Check wiring connections
Clears after voltage is
higher than 20VAC for
two seconds, or after
power reset.
Fast simultaneous flashing of
DS11, DS13, DS14 and DS15
OEM Mode Factory Test Mode.
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