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506586−01 10/10
System fault and lockout LED (DS11 / DS14) alarm codes takes precedence over system status LED codes (cooling, heating stages or
defrost/dehumidification). Only the latest active LED fault or lockout alarm code if present will be displayed. If no fault or lockout codes are active, then
system status LEDs are routinely displayed. See notes 1 and 2 in table below for duration of fast / slow flashes and pause.
Heat Pump Control
LEDs
SolutionPossible Cause(s)Condition
icomfort
Touch
®
Thermostat
Display
DS11
Green
SolutionPossible Cause(s)Condition
icomfort
Touch
®
Thermostat
Display
DS14 Red
DS11
Green
SolutionPossible Cause(s)Condition
icomfort
Touch
®
Thermostat
Display
DS14 Red
Slow flash On
Moderate
Alert Code
414
Discharge line
temperature fault
This code indicates high discharge temperatures. If the discharge line temperature
exceeds a temperature of 279ºF (137ºC) during compressor operation, the control
will de−energize the compressor contactor output (and the defrost output if active).
The compressor will remain off until the discharge temperature has dropped below
225ºF (107ºC).
Fast flash On
Critical Alert
Code 415
Discharge line
temperature
lockout
Off Fast flash
Moderate /
Critical Alert
Code 417
Discharge sensor
fault
The heat pump control (A175) detects open or short sensor or out of temperature
sensor range. This fault is detected by allowing the unit to run for 90 seconds before
checking sensor resistance. If the sensor resistance is not within range after 90
seconds, the control will raise the alarm.
3 fast
flashes
then pause
Off
Moderate /
Critical Alert
Code 418
W output
hardware fault
When auxiliary heat output is detected as active. Fault in the heat pump control.
Replace heat pump control. See figure 30 for further details.
3 fast
flashes
then pause
On
Moderate /
Critical Alert
Code 419
W output
hardware fault
lockout
If heat pump control recognizes five output hardware fault events during a single
cooling demand, the heat pump control will initiate a lockout. See figure 30 for fur-
ther details.
Off
3 fast
flashes
then pause
Critical Alert
Code 421
W external
miswire fault
When auxiliary heat output is detected as active after compressor has been de−en-
ergized. See figure 30 for further details.
Simultaneous fast
flashes then pause
None
Second−stage
heat lock−in
If the unit is in non−communicating mode and it goes to second stage due to ambi-
ent temperature being below second stage lock−in setting (E48).
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.