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| Alarm Codes and Troubleshooting | |
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Alarm ID | Message Name |
| Action required to Clear/Recover |
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10 | Unknown Device Detected − DEVICE2 |
| Reconfigure the system. Press and hold Lennox Logo, press setup tab, press start, and press confirm. If still |
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| persists, then check all DEVICE connections to make sure they are icomfort compatible. |
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11 | Missing DEVICE2 |
| Check all connections and cycle system power. If problem persists, then reconfigure the system (procedure |
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| mentioned above). |
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12 | Incomplete System |
| Thermostat did not find an Indoor Unit. Check connections and cycle power. Replace board if no response. |
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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 |
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| to the system. Check wiring and remove duplicate equipment. |
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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. |
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19 | High Ambient Auxiliary Heat Lockout |
| Notification only − Outdoor Temp is above the High Balance Point. Indoor Unit (Furnace or Electric Heat) will not |
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| be used to service a Heating Call. |
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29 | Over Temperature Protection |
| Indoor Temp went above 99ºF during a heating or cooling call. Heating is not allowed. Check that Thermostat |
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| Sensor is accurate. Check that Heating Equipment is not stuck ON (reversing value, etc.). Select system mode |
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| to cooling to try and cool the indoor space. |
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30 | Low Temperature Protection |
| Indoor Temp went below 40ºF. Cooling is not allowed. Check that cooling equipment is not stuck ON. Check |
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| accuracy of the thermostat temperature. Try to heat the space to above 40ºF. |
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31 | Lost Communication with DEVICE2 |
| DEVICE2 is not communicating to the thermostat for more than 3 minutes. Check connections if fault persists, |
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| then cycle power. |
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32 | Asynchronous Reset DEVICE2 |
| DEVICE2 is resetting by itself. Check power connections, and check 24VAC voltage at DEVICE. The alarm is |
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| only cleared by pressing the clear button on the Installer Alerts Tab. If fault persists after checking connections, |
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| replace board. |
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34 | Must Program Unit Capacity for DEVICE2 |
| DEVICE2 is missing the programmed unit capacity. Go to DEVICE2 and program unit capacity manually. See |
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| unit IOM for instructions. |
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35 | Incorrect Operation of DEVICE2 |
| DEVICE2 did not follow the command of the thermostat. Check connections and cycle power. |
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105 | Communication Problem |
| Equipment is unable to communicate. Check for miswired and/or loose connections and check for a high volt- |
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| age source of noise close to the system (welder etc.). |
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110 | Low AC Line Voltage |
| Line Voltage Low (Voltage lower than nameplate rating). Check voltage. |
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113 | High AC Line Voltage |
| Line Voltage High (Voltage higher than nameplate rating). Check voltage. |
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114 | AC Line Frequency/Distortion Problem |
| No 60 Hertz Power (Check voltage and frequency). |
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115 | Low Secondary (24VAC) Voltage |
| 24 Voltage Low (Range is 18 and 30 volts ). Check voltage. |
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116 | High Secondary (24VAC) Voltage |
| 24 Voltage High (Range is 18 and 30 volts ). Check voltage. |
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120 | Unresponsive DEVICE2 |
| Usually caused by delay in outdoor unit responding to indoor unit poling recycle power, check wiring. |
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124 | Active Subnet Controller Missing |
| Equipment lost communication with the thermostat. Check connections and cycle power on the thermostat. |
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table continued on next page
Page 31 | icomfortt Touch Screen 7−Day Programmable Thermostat |
