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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
On On Not applicable
Air conditioner
control failure
Indicates that control has internal component failure. Cycle 24 volt power to
control. If code does not clear, replace control.
On
2 fast
flashes
then pause
Not applicable Defrost
These are codes that show status of operation whether in low stage or high stage,
heating or cooling, defrost or in the EDA mode.
1 fast
flashes
then pause
Off Not applicable
First−stage
compressor
cooling
These are codes that show status of operation whether in low stage or high stage,
heating or cooling, defrost or in the EDA mode.
2 fast
flashes
then pause
Off Not applicable
Second−stage
compressor
cooling
These are codes that show status of operation whether in low stage or high stage,
heating or cooling, defrost or in the EDA mode.
2 fast
flashes
then pause
On Not applicable
Dehumidification
mode
These are codes that show status of operation whether in low stage or high stage,
heating or cooling, defrost or in the EDA mode.
ALERT STATUS
None None
Moderate Alert
Code 105
Device
communication
failure
icomfort Toucht thermostat device is unable to communicate with any other
device on the RSBus. Alarm only occurs if a specific device did communicate
initially after power up and communication was later lost. Possible causes are
lost connection, bus short or open, or other device stop responding.
None None
Moderate Alert
Code 120
Unresponsive
device
Message could be sent by any device on RSBus if expected response
message is not received from other device. If sent by indoor or outdoor control,
device did not get expected response (incorrect or no response at all) from
active Subnet controller. If sent by the icomfort Toucht thermostat, and did not
get the expected response (incorrect or no response at all) from device.
Normally this indicate device malfunction.
None None
Critical Alert
Code 124
Active subnet
controller missing
Device lost connection to icomfort Toucht thermostat. Thermostat is sending
heartbeat message in one minute intervals. Device sets this alarm if no
Heartbeat is received for three minutes. Normally this indicate lost connection
to thermostat, or thermostat is not working. Alert will clear after valid subnet
controller message is received.
None None
Critical Alert
Code 125
Hardware failure
Entire or partial system failure. Alert will clear 300 seconds after fault has
recovered.
None None
Moderate /
Critical Alert
Code 126
Internal control
communication
failure
Internal communication on outdoor control. Alert will clear 300 seconds after
fault has recovered.
None None
Critical Alert
Code 131
Corrupted control
parameters
System stored configuration data is corrupted. System will not run. Refer to
communicating thermostat for memory corrupt handling.
None None
Critical Alert
Code 132
Failed flash CRC
check.
No operations, A175 control enters boot loader mode. Alarm will clears after
reset.
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