Page 37
XP21
Heat Pump Control
LEDs
Clearing Sta-
tus
Solution
Possible
Cause(s)
Condition
icomfortt
Thermostat
Display
DS15
Yellow
Clearing Sta-
tus
Solution
Possible
Cause(s)
Condition
icomfortt
Thermostat
Display
DS13
Red
4 flashes
then
pause
Off
Critical Alert
Code 404
Locked rotor
Compressor has
a locked out due
to run capacitor
short, bearings
are seized,
excessive liquid
refrigerant.
1
Run capacitor has failed.
2
Low line voltage (contact utility if voltage at
disconnect is low).
Check wiring connections
3
Excessive liquid refrigerant in the compressor.
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 condi-
tions.
1
Outdoor unit power disconnect is open.
2
Unit circuit breaker or fuse(s) is open.
3
Unit contactor has failed to close.
Check compressor contactor wiring and
connectors
Check for compressor contactor failure
(burned, pitted or open)
Check wiring and connectors between supply
and compressor
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.
Check compressor motor winding resistance
Clears after one
normal com-
pressor 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.
Check wiring and connectors between supply
and the compressor S terminal
3
Compressor start winding is damaged.
Check compressor motor winding resistance
Clears when
amperage is de-
tected 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.
Check wiring and connectors between supply
and the compressor R terminal
2
Compressor start winding is damaged.
Check compressor motor winding resistance
Clears when
amperage is de-
tected 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 com-
pressor run
cycle or after
power reset.
9 flashes
then
pause
Off
Moderate/
Critical Alert
3
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).
Check wiring connections
Clears after
voltage is high-
er than 20VAC
for two sec-
onds, or after
power reset.
Fast simultaneous flashing of DS11,
DS13, DS14 and DS15
OEM Mode Factory test mode.
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.
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