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Table 10. Alert Codes and Troubleshooting
Alert
Priority
Alert Text
Code
(Thermostat) The thermostat has found an
10
Critical
unknown device on the system.
(Thermostat) The thermostat cannot find a
11
Critical
previously installed unit.
(Thermostat) The thermostat cannot find an
12
Critical
iComfort-enabled indoor unit.
(Thermostat) The thermostat found more
than one thermostat, more than one indoor
14
Critical
unit, or more than one outdoor unit on the
system.
(Thermostat) The outside temperature is be
low the level where the heat pump is pro
18
Minor
grammed to heat the home. The system will
not use the heat pump to warm your home.
(Thermostat) The outside temperature is
higher than the level where the furnace or
19
Minor
electric heat is programmed to work. The
system will only use the heat pump to warm
your home.
(Thermostat) The thermostat is reading an
indoor temperature that is higher than 99ºF.
29
Critical
The thermostat will not allow any heating op
eration to begin until it senses a temperature
lower than 99ºF.
(Thermostat) The thermostat is reading an
indoor temperature that is lower than 40ºF.
30
Moderate
The thermostat will not allow any cooling op
eration to begin until it senses a temperature
higher than 40ºF.
(Thermostat) The thermostat has lost com
31
Critical
munication with the (furnace, air-handler or
outdoor unit) for more than 3 minutes.
(Thermostat) The (furnace, air-handler or
32
Moderate
outdoor unit) is resetting itself.
(Thermostat) The thermostat does not know
the capacity (tonnage) of the (furnace, air-
34
Critical
handler or outdoor unit). Please program the
correct capacity of the (furnace, air-handler
or outdoor unit).
(Thermostat) The system has been heating
for at least 15 minutes, without a demand for
36
Critical
heating.
(Thermostat) The system has been cooling
for at least 15 minutes, without a demand for
37
Critical
cooling.
(Thermostat) The system has not been able
to turn on the heating for more than 45
38
Critical
minutes. The system will go offline for 60
minutes and try again.
(Thermostat) The system has not been able
to turn on the cooling for more than 45
39
Critical
minutes. The system will go offline for 60
minutes and try again.
(Thermostat / Furnace / Air Handler / Out
door Unit/ Equpment Interface Module /
105
Critical
Damper Control Module) The (Thermostat,
furnace, air-handler or outdoor unit) has lost
communication with the rest of the system.
110
Critical
(Furnace) The line voltage is too low.
(Furnace) The line power voltage wiring is
111
Critical
reversed.
(Furnace) The reporting device cannot find
112
Critical
earth ground. The thermostat will shut down
the system.
507152-01
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.
Steps to clear
An unknown device is seen on the sub-net in or outside of configuration mode. Clear by recon
figuring the system. Press the setup tab, press start, and press confirm. If problem persists,
then check all DEVICE connections to make sure they are iComfort-compatible.
Check all connections and cycle system power. If problem persists, clear by reconfiguring the
system. Press the setup tab, press start, and press confirm. If problem persists, then check all
DEVICE connections to make sure they are iComfort-compatible.
Thermostat did not find an Indoor Unit. Make sure there is an iComfort indoor unit on the sys
tem. Check R, i+, i- and C connections, ohm wires and cycle power. Replace indoor unit control
board if there is no response.
Check wiring and remove duplicate equipment. Reconfigure system.
Notification only - Outdoor Temp is below the Low Balance Point. Heat Pump will not be used to
service a heating demand.
Notification only - Outdoor Temp is above the High Balance Point. Indoor Unit (furnace or air-
handler) will not be used to service a heating demand.
Indoor temperature rose above 99ºF during a heating or cooling demand. Heating operation is
not allowed. Check to ensure that Heating Equipment is not stuck ON (reversing valve, etc.).
Check the accuracy of the thermostat temperature sensor. Select cooling system mode to cool
the indoor space.
Indoor Temp fell below 40ºF. Cooling operation is not allowed. Check to ensure that cooling
equipment is not stuck ON. Check accuracy of the thermostat temperature sensor. Select
heating system mode to heat the indoor space to above 40ºF.
[Indicated unit] has not communicated with thermostat for more than 3 minutes. Check connec
tions. Ohm wires. If fault persists, then cycle power. Fault clears after communication is re
stored.
[Indicated unit] is resetting itself. This event may occur during a power outage or power fluctu
ation in the system. If persistent or if it coincides with the system operation then proceed with
the following steps. Check the power connections, check the amp draw at the transformer (the
transformer maybe overloaded) and check 24VAC voltage at the DEVICE. The alarm is only
cleared by pressing the clear button on the Installer Alerts Tab. If the fault persists after check
ing the connections, replace the unit's control board.
[Indicated unit] is missing the programmed unit capacity. Go to [Indicated unit] and program the
unit capacity manually. See the unit IOM for programming instructions. Remove power to ther
mostat before programming the unit control board. Once programming is complete, reconnect
thermostat wires and reconfigure system.
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 expected.
Step 1: Check all heating equipment to determine cause of heating demand.
Step 2: Recycle power.
System will clear code when it detects condition has cleared.
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 expected.
Step 1: Check all cooling equipment to determine cause of cooling demand.
Step 2: Recycle power.
System will clear code when it detects condition has cleared.
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 expected.
Step 1: Check all heating equipment to determine cause.
Step 2: Recycle power.
System will clear code when it detects condition has cleared.
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 expected.
Step 1: Check all cooling equipment to determine cause.
Step 2: Recycle power.
System will clear code when it detects condition has cleared.
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 self-recoverable error.
This alarm/code may appear during a brownout. Line voltage is below its designed operating
value. Check and correct the power line voltage.
The unit is reporting that its power line and neutral are reversed. Turn off the power to the sys
tem and correct the line power voltage wiring. System resumes normal operation 5 seconds
after fault recovered.
Provide proper earth ground to the equipment. System resumes normal operation 5 seconds
after fault recovered.
Page 26
table continued on next page
7/2013
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