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XC21
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.
Air Conditioner
Control LEDs
Solution
Possible
Cause(s)
Condition
icomfort
Toucht
Thermostat
Display
DS11
Green
Solution
Possible
Cause(s)
Condition
icomfort
Toucht
Thermostat
Display
DS14
Red
DS11
Green
Solution
Possible
Cause(s)
Condition
icomfort
Toucht
Thermostat
Display
DS14
Red
Off
Slow flash
Moderate Alert
Code 410
Low pressure
fault
1
Restricted air
flow over indoor
or outdoor coil.
2
Improper
refrigerant
charge in
system.
3
Improper
metering device
installed or
incorrect
operation of
metering
device.
4
Incorrect or
improper
sensor location
or connection to
system.
1
Remove any blockages or restrictions from coils and/or
fans. Check indoor and outdoor fan motor for proper
current draws.
2
Check system charge using approach and subcooling
temperatures.
3
Check system operating pressures and compare to unit
charging charts.
4
Make sure all pressure switches and sensors have
secure connections to system to prevent refrigerant
leaks or errors in pressure and temperature
measurements.
Off On
Critical Alert
Code 411
Low pressure
switch lockout
Slow flash Off
Moderate Alert
Code 412
High pressure
fault
On Off
Critical Alert
Code 413
High pressure
switch lockout
Slow flash On
Moderate Alert
Code 414
Discharge line
temperature fault
This code detects 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 A175 control 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.
Simultaneous Fast flash
then Pause
None
Second−stage
heat lock−in
If the unit is in non−communicating mode and it goes to second stage due to
ambient 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.
Table 10. Compressor Fault and Lockout LED Codes and Related icomfort Toucht Thermostat Alert Codes
NOTE See notes 1 and 2 in table below for duration of fast / slow flashes and pause.
Air Conditioner
Control LEDs
icomfort
Toucht
Thermostat
Display
Condition
Possible
Cause(s)
Solution
Clearing Status
DS15
Yellow
DS13
Red
Off On
Moderate/
Critical Alert
3
400
Compressor
internal
overload trip
Thermostat
demand signal
Y1 is present, but
compressor not
running
1
Compressor protector is open.
S Check for high head pressure
S Check compressor supply voltage
2
Outdoor unit power disconnect is open.
3
Compressor circuit breaker or fuse(s) is
open.
4
Broken wire or connector is not making
contact.
5
Low or high pressure switch open if present
in the system.
6
Compressor contactor has failed to close.
Clears the error
after current is
sensed in the run
and start winding
for two seconds,
service removed or
power reset.
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