Alarm Codes and Troubleshooting

 

 

 

 

Alarm ID

Message Name

 

Action required to Clear/Recover

 

 

 

 

10

Unknown Device Detected − DEVICE2

 

Reconfigure the system. Press and hold Lennox Logo, press setup tab, press start, and press confirm. If still

 

 

 

persists, then check all DEVICE connections to make sure they are icomfort compatible.

 

 

 

 

11

Missing DEVICE2

 

Check all connections and cycle system power. If problem persists, then reconfigure the system (procedure

 

 

 

mentioned above).

 

 

 

 

12

Incomplete System

 

Thermostat did not find an Indoor Unit. Check connections and cycle power. Replace board if no response.

 

 

 

 

14

Too Many Devices of the Same Type

 

Thermostat found more than one outdoor unit, or more than 1 indoor unit, or more than 1 thermostat connected

 

 

 

to the system. Check wiring and remove duplicate equipment.

 

 

 

 

18

Low Ambient HP Heat Lockout

 

Notification only − Outdoor Temp is below the Low Balance Point. HP will not be used to service a Heating Call.

 

 

 

 

19

High Ambient Auxiliary Heat Lockout

 

Notification only − Outdoor Temp is above the High Balance Point. Indoor Unit (Furnace or Electric Heat) will not

 

 

 

be used to service a Heating Call.

 

 

 

 

29

Over Temperature Protection

 

Indoor Temp went above 99ºF during a heating or cooling call. Heating is not allowed. Check that Thermostat

 

 

 

Sensor is accurate. Check that Heating Equipment is not stuck ON (reversing value, etc.). Select system mode

 

 

 

to cooling to try and cool the indoor space.

 

 

 

 

30

Low Temperature Protection

 

Indoor Temp went below 40ºF. Cooling is not allowed. Check that cooling equipment is not stuck ON. Check

 

 

 

accuracy of the thermostat temperature. Try to heat the space to above 40ºF.

 

 

 

 

31

Lost Communication with DEVICE2

 

DEVICE2 is not communicating to the thermostat for more than 3 minutes. Check connections if fault persists,

 

 

 

then cycle power.

 

 

 

 

32

Asynchronous Reset DEVICE2

 

DEVICE2 is resetting by itself. Check power connections, and check 24VAC voltage at DEVICE. The alarm is

 

 

 

only cleared by pressing the clear button on the Installer Alerts Tab. If fault persists after checking connections,

 

 

 

replace board.

 

 

 

 

34

Must Program Unit Capacity for DEVICE2

 

DEVICE2 is missing the programmed unit capacity. Go to DEVICE2 and program unit capacity manually. See

 

 

 

unit IOM for instructions.

 

 

 

 

35

Incorrect Operation of DEVICE2

 

DEVICE2 did not follow the command of the thermostat. Check connections and cycle power.

 

 

 

 

105

Communication Problem

 

Equipment is unable to communicate. Check for miswired and/or loose connections and check for a high volt-

 

 

 

age source of noise close to the system (welder etc.).

 

 

 

 

110

Low AC Line Voltage

 

Line Voltage Low (Voltage lower than nameplate rating). Check voltage.

 

 

 

 

113

High AC Line Voltage

 

Line Voltage High (Voltage higher than nameplate rating). Check voltage.

 

 

 

 

114

AC Line Frequency/Distortion Problem

 

No 60 Hertz Power (Check voltage and frequency).

 

 

 

 

115

Low Secondary (24VAC) Voltage

 

24 Voltage Low (Range is 18 and 30 volts ). Check voltage.

 

 

 

 

116

High Secondary (24VAC) Voltage

 

24 Voltage High (Range is 18 and 30 volts ). Check voltage.

 

 

 

 

120

Unresponsive DEVICE2

 

Usually caused by delay in outdoor unit responding to indoor unit poling recycle power, check wiring.

 

 

 

 

124

Active Subnet Controller Missing

 

Equipment lost communication with the thermostat. Check connections and cycle power on the thermostat.

 

 

 

 

table continued on next page

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icomfortt Touch Screen 7−Day Programmable Thermostat

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Lennox International Inc 2P1109 Alarm Codes and Troubleshooting, Alarm ID Message Name Action required to Clear/Recover