507341-01
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Table 1. Alert Codes and Troubleshooting
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.
Alert
Code
Steps to clear
Alert Text
Priority
39
Critical
(Thermostat) The system has not been able
to turn on the cooling for more than 45
minutes. The system will go offline for 60
minutes and try again.
Run the system in diagnostic mode and verify that it matches actual equipment operation.
Check for other alarms/codes that may be preventing the system from operating as ex
pected.
Step 1: Check all cooling equipment to determine cause.
Step 2: Recycle power.
System will clear code when it detects condition has cleared.
105
Critical
(Thermostat / Furnace / Air Handler / Out
door Unit/ Equipment Interface Module /
Damper Control Module) The
(Thermostat,
furnace, airhandler or outdoor unit)
has lost
communication with the rest of the system.
Equipment is unable to communicate. This may indicate the existence of other alarms/
codes. In most cases errors are related to electrical noise. Make sure high voltage power
is separated from RSBus. Check for incorrectly wired and/or loose connections between
the Thermostat, indoor unit and outdoor unit. Check for a high voltage source of noise
close to the system. Generally, this is a selfrecoverable error.
110
Critical
(Furnace) The line voltage is too low.
This alarm/code may appear during a brownout. Line voltage is below its designed operat
ing value. Check and correct the power line voltage.
111
Critical
(Furnace) The line power voltage wiring is
reversed.
The unit is reporting that its power line and neutral are reversed. Turn off the power to the
system and correct the line power voltage wiring. System resumes normal operation 5
seconds after fault recovered.
112
Critical
(Furnace) The reporting device cannot find
earth ground. The thermostat will shut down
the system.
Provide proper earth ground to the equipment. System resumes normal operation 5
seconds after fault recovered.
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 operation 5 seconds after fault recovered.
114
Critical
(Furnace / Air Handler/ / Equipment Interface
Module / Damper Control Module)) There is
a frequency/distortion problem with the
power to the
(furnace or airhandler).
This alarm/code may indicate transformer overloading. Check the voltage and line power
frequency. Check the generator operating frequency, if the system is running on backup
power. Correct voltage and frequency problems. System resumes normal operation 5
seconds after fault recovered.
115
Critical
(Furnace / Air Handler) The 24VAC to the
(furnace or airhandler control board)
is
lower than the required range of 18 to
30VAC.
24Volt Power Low (Range is 18 to 30 volts). Check and correct voltage. Check for addi
tional powerrobbing equipment connected to system. This alarm/code may require the
installation of an additional or larger VA transformer.
115
Critical
(Damper Control Module) The secondary
24VAC damper control module is low.
24Volt Power Low (Range is 18 to 30 volts). Check and correct voltage. Check for addi
tional powerrobbing equipment connected to system. This alarm/code may require the
installation of an additional or larger VA transformer.
