Page 36
XC21
System Status, Fault and Lockout LED
Codes
LED codes are displayed using various LEDs located on
the air conditioner control (A175). See page 26 for location
of air conditioner control LEDs.
DS11 AND DS14 SYSTEM STATUS, FAULT AND
LOCKOUT LED CODES
DS11 (Green) and DS14 (Red) LEDs indicate
non−communicating mode diagnostics conditions that are
listed in table 9.
These LEDs display fault conditions in system cooling
capacity, dehumidification mode, anti−short cycle lockout,
high and low pressures, high discharge line temperature,
outdoor ambient temperature, and discharge sensor
failures.
DS15 AND DS13 COMPRESSOR FAULT AND
LOCKOUT LED CODES
DS15 (Yellow) and DS13 (Red) LEDs indicate
non−communicating mode diagnostics conditions that are
listed in table 10.
These LEDs display the most common fault conditions in
the system. When an abnormal condition is detected, this
function communicates the specific condition through
system diagnostic LEDs. The function is capable of
detecting both mechanical and electrical system problems.
IMPORTANT
DS15 and DS13 compressor LED fault and lockout
codes do not provide safety protection. The is a
monitoring function only and cannot control or shut down
other devices.
RESETTING LED FAULT AND LOCKOUT LED CODES
All LED fault and lockout codes can be reset manually or
automatically:
1. Manual Reset
Manual reset can be achieve by one of the following
methods:
S Disconnecting R wire from the air conditioner
control’s R terminal.
S Turning the indoor unit off an on again.
Cycle the 24VAC power to air conditioner control off
and on. After power up, existing code will display for 60
seconds and then clear.
2. Automatic Reset
After a fault or lockout is detected, the air conditioner
control continues to monitor the unit’s system and
compressor operations. When/if conditions return to
normal, the alert code is turned off automatically.
Table 9. System Status, Fault and Lockout LED Codes and Related icomfort Toucht Thermostat Alert Codes
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
icomfort
Toucht
Thermostat
Display
Condition
Possible
Cause(s)
Solution
DS11
Green
DS14
Red
SYSTEM STATUS
Off Off Not applicable Power problem
No power (24V)
to control
terminals R and
C or control
failure.
1
Check control transformer power (24V).
2
If power is available to control and LED(s) do not light,
replace control.
Simultaneous slow flash Not applicable Normal operation
Unit operating
normally or in
standby mode.
Indicates that control has internal component failure. Cycle
24 volt power to control. If code does not clear, replace
control.
Alternating slow flash Not applicable
5−minute
anti−short−cycle
delay
Initial power up,
safety trip, end of
room thermostat
demand.
None required (Jumper FIELD TEST pins to override)
Simultaneous fast flash
Moderate /
Critical Alert
Code 180
Ambient sensor
problem
Sensor being detected open or shorted or out of temperature range. control
will revert to time/temperature defrost operation. (System will still heat or cool).
Alternating fast flash
Moderate /
Critical Alert
Code 417
Coil sensor
problem
This model does not utilize a coil sensor, however this alert indicates either an
open or shorted circuit. See if 10K resistor is not damage or missing. Resistor
is located in the sensor harness assembly, brown lead.
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