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506518−01
A175 Main Control LED System Status
and Alert and Codes
LED alert codes are display using various LEDs located on
the A175 Main Control.
DS11 AND DS14 LED SYSTEM AND ALERT 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, discharge line temperature,
outdoor temperature, and discharge sensor failures.
DS15 AND DS13 LED COMPRESSOR ALERT 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.
RESETTING LED ALERT CODES
LED alert 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 A175 main
control’s R terminal.
S Turning the indoor unit off an on again.
Cycle the 24VAC power to A175 main control off and
on. After power up, existing code will display for 60
seconds and then clear.
2. Automatic Reset
After an alert is detected, the A175 main control
continues to monitor the unit’s system and
compressor operations. When/if conditions return to
normal, the alert code is turned off automatically.
IMPORTANT
LED alert codes do not provide safety protection. The is a monitoring function only and cannot control or shut down other
devices.
Table 9. System Alert Codes (A175 Main Control LEDs and Communicating Thermostat User Interface)
Outdoor A175 Main
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.
ON ON Not Applicable
A175 Main
Control Failure
Indicates that control has internal component failure. Cycle 24 volt power to
control. If code does not clear, replace control.
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