Lennox XP17-024-230-01 Installation And Service Procedure page 18

Heat Pump Control
iComfortt iComfortt
LEDs
-enabled -enabled
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 Off Critical Alert
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. Initially a moderate status is displayed and is escalated to critical if alarm exists for more than 10 minutes.
XP17
Possible Possible
Condition Condition
Cause(s) Cause(s)
Compressor has
an open circuit
due to power dis­
connection, fuse
Open circuit
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
3
low voltage 18VAC.
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 failure
(burned, pitted or open)
S
Check wiring and connectors between supply
and compressor
S
Check for low pilot voltage at compressor
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 resistance
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 resistance
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 resistance
1
Compressor contactor failed to open.
2
Thermostat demand signal not connected to
module.
1
Control circuit transformer is overloaded.
2
Low line voltage (contact utility if voltage at
disconnect is low).
S
Check wiring connections
Page 18
Clearing Sta­ Clearing Sta­
tus tus
Clears after one
normal com­
pressor run
cycle or power
reset.
Clears when
amperage is de­
tected in RUN
and START
sensors, or af­
ter power reset.
Clears when
amperage is de­
tected in RUN
and START
sensors, or af­
ter power reset.
Clears after one
normal com­
pressor run
cycle or after
power reset.
Clears after
voltage is high­
er than 20VAC
for two sec­
onds, or after
power reset.