17
Alert Codes and Troubleshooting
Error codes are transmitted to the thermostat. No codes are stored in the EIM.
Table 10. Alert Codes and Troubleshooting
Alert Code Priority
Condition
Applicable System
Component(s)
Alert Text Component or System Operational State
and Troubleshooting Tip
How to clear the alert code
10 Critical
All Lennox Communicating
thermostats.
Communicating air handler,
furnace, outdoor unit, EIM
and iHarmony.
The thermostat has
found an unknown de-
vice on the system.
Lennox communicating thermostat when NOT in con guration mode
has detected an unknown device. Typically the thermostat will send
a command to the unknown device and place it in a soft disable
state.
The soft disable control will indicate as follows:
√ On air handler, furnace and outdoor controls, the state is displayed
by double horizontal lines on sev en-segment display.
√ On the damper control module or equipment inter face equipment,
the green LED will blink three sec onds on and one second o.
Cycling power to the soft disabled control may clear the condition.
If cycling power does not clear the soft disabled state then replace
control.
Clear alert code by recon-
guring the system
12 Critical
All Lennox Communicating
thermostats.
Lennox Communicating
furnace, EIM or air handler
The thermostat cannot
nd a Lennox commu-
nicating indoor unit
Lennox communicating thermostat did not nd an indoor unit. Make
sure there is an Lennox communicating indoor unit on the system.
√ Check R, i+, i- and C connections and voltages.
√ Ohm wires and cycle power.
√ Check for voltage and missing component.
√ Verify that equipment interface module is congured as air handler
or furnace when used with a non-com municating indoor unit.
√ Go to menu > advanced settings > view dealer control center
> equipment and press reset all equipment. This will allow the
system to auto-detect any Lennox communicating components
attached.
√ Replace indoor unit control if there is no response.
Automatically clears when
the system detects that the
issue no longer exists.
105 Critical
All Lennox Communicating
thermostats.
Lennox Communicating
furnace, air handler, outdoor
unit, EIM or iHarmony
A system component
has lost communication
with the system.
System component (device) is unable to communi cate.
√ This may indicate the existence of other active alert codes.
√ In most cases errors are related to electrical noise. Verify that high
voltage power is separated from the low voltage communication
wires.
√ Check for incorrectly wired or loose connections be tween system
components (devices).
√ Check for a high voltage source of noise close to the system.
Automatically clears when
the system detects the
issue no longer exists.
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