507343-01
Page 46
Table 10. Alert Codes and Troubleshooting
Critical alerts are displayed on the Home screen, in the Home
owner alert button, and in the Installer alert button. Minor and
moderate alerts are found only in the Installer alert button.
Alert
Code
PRIORITY
CONDITION
APPLICABLE
SYSTEM
COMPONENTS
ALERT TEXT
COMPONENT OR SYSTEM OPERA
TIONAL STATE AND TROU
BLESHOOTING TIP
HOW TO CLEAR
ALERT CODE
105 Critical
Thermostat, fur
nace, air handler,
outdoor unit,
equipment inter
face or IHarmony
damper control
module
A system component has lost
communication with the sys
tem.
System component (device) is
unable to communicate.
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 between sys
tem components (devices).
Check for a high voltage source
of noise close to the system.
Automatically clears
when the system de
tects the issue no
longer exists.
110 Critical
Furnace
The component line voltage is
too low.
This alert code may appear dur
ing a brownout.
Line voltage is below its designed
operating value.
Check and correct the power line
voltage.
Automatically clears
when the system de
tects the issue no
longer exists.
111 Critical
Furnace
The component line power volt
age wiring is reversed.
The unit is reporting that its power
and neutral lines are reversed.
Turn off the power to the system
and correct the line power voltage
wiring.
System resumes normal opera
tion five seconds after critical
condition is recovered.
Automatically clears
when the system de
tects the issue no
longer exists.
112 Critical
Furnace
The reporting component can
not find earth ground.
The thermostat will shut down the
system.
Provide proper earth ground to
the equipment.
System resumes normal opera
tion five seconds after critical
condition is recovered.
Automatically clears
when the system de
tects the issue no
longer exists.
113 Critical
Furnace
The line voltage is too high.
Line voltage high (voltage higher
than nameplate rating).
Provide power voltage within
proper range.
System resumes normal opera
tion five seconds after critical
condition is recovered.
Automatically clears
when the system de
tects the issue no
longer exists.
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