Lennox XC17 Series Unit Information page 40

Air Conditioner
icomfort icomfort
Control LEDs
Toucht Toucht
Thermostat Thermostat
DS15 DS13
Yellow Red Display Display
5 Flashes
Critical Alert
then OFF
Code 405
Pause
6 Flashes
Critical Alert
then OFF
Code 406
Pause
7 Flashes
Critical Alert
then OFF
Code 407
Pause
8 Flashes
Critical Alert
then OFF
Code 408
Pause
9 Flashes Moderate/
then Critical Alert
OFF
Pause Code 409
Fast simultaneous flashing of
DS11, DS13, DS14 and DS15
1. Pause duration is two (2) seconds.
2. Fast flash duration is 1/2 second. Slow flash duration is one (1) second.
3. Moderate and escalated up to critical if alarm exists for more than 10 minutes.
XC17
Possible Possible
Condition Condition
Cause(s) Cause(s)
Compressor has
an open circuit
due to power dis-
Open Circuit connection, fuse
is open or other
similar condi-
tions.
Current not
Open Start
sensed by Start
Circuit
transformer.
Current not
Open Run
sensed by run
Circuit
transformer.
Welded Compressor
Contactor always runs
Secondary 24VAC is below
Low Voltage 18VAC.
3
OEM Mode Factory Test Mode.
Solution Solution
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 be-
tween supply and compressor
S
Check for low pilot voltage at com-
pressor contactor coil
4
High pressure switch is open and re-
quires manual reset.
5
Open circuit in compressor supply wiring
or connections.
6
Unusually long compressor protector re-
set time due to extreme ambient temper-
ature.
7
Compressor windings are damaged.
S
Check compressor motor winding re-
sistance
1
Run capacitor has failed.
2
Open circuit in compressor start wiring or
connections.
S
Check wiring and connectors be-
tween supply and the compressor S
terminal
3
Compressor start winding is damaged.
S
Check compressor motor winding re-
sistance
1
Open circuit in compressor start wiring or
connections.
S
Check wiring and connectors be-
tween supply and the compressor R
terminal
2
Compressor start winding is damaged.
S
Check compressor motor winding re-
sistance
1
Compressor contactor failed to open.
2
Thermostat demand signal not con-
nected to module.
1
Air conditioner control (A175) circuit trans-
former is overloaded.
2
Low line voltage (contact utility if voltage
at disconnect is low).
S
Check wiring connections
Page 40
Clearing Status Clearing Status
Clears after one normal
compressor run cycle or
power reset.
Clears when amperage
is detected in RUN and
START sensors, or after
power reset.
Clears when amperage
is detected in RUN and
START sensors, or after
power reset.
Clears after one normal
compressor run cycle or
after power reset.
Clears after voltage is
higher than 20VAC for
two seconds, or after
power reset.