Lennox International Inc CBX40UHV02, XP2101, XC2105, XC1702, XP1906 Alert Codes and Troubleshooting

Table 5. 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	Priority	Alert Text	Steps to clear
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) There is a frequency/	This alarm/code may indicate transformer overloading. Check the voltage and line power frequency.
		distortion problem with the power to the (furnace	Check the generator operating frequency, if the system is running on back−up power. Correct voltage
		or air−handler).	and frequency problems. System resumes normal operation 5 seconds after fault recovered.
115	Critical	(Furnace / Air Handler) The 24VAC to the (fur-	24−Volt Power Low (Range is 18 to 30 volts). Check and correct voltage. Check for additional power−
		nace or air−handler control board) is lower than	robbing equipment connected to system. This alarm/code may require the installation of an addition-
		the required range of 18 to 30VAC.	al or larger VA transformer.
117	Minor	(Furnace) The reporting unit has poor earth	Provide proper grounding for the unit. Check for proper earth ground to the system. The alarm/code
		grounding.	will clear 30 seconds after it is corrected.
120	Moderate	(Stat / Furnace / Air Handler / Outdoor Unit)	Typically, this alarm/code does not cause any issues and will clear on its own. The alarm/code is
		There is a delay in the (stat, furnace, air−handler	usually caused by a delay in the outdoor unit responding to the thermostat. Check all wiring connec-
		or outdoor unit) responding to the system.	tions. Cleared after unresponsive device responds to any inquiry.
124	Critical	(Stat / Furnace / Air Handler / Outdoor Unit) The	Equipment lost communication with the thermostat. Check the wiring connections, ohm wires and
		thermostat has lost communication with the (fur-	cycle power. The alarm stops all associated HVAC operations and waits for a heartbeat message
		nace, air−handler or outdoor unit) for more than	from the unit that’s not communicating. The alarm/fault clears after communication is re−established.
		3 minutes.
125	Critical	(Stat / Furnace / Outdoor Unit) There is a hard-	There is a control hardware problem. Replace the control if the problem prevents operation and is
		ware problem on either the (stat, furnace control	persistent. The alarm/fault is cleared 300 seconds after the fault recovers.
		board, air−handler control board or outdoor unit
		control board).
126	Critical	(Furnace / Outdoor Unit) There is an internal	There is an internal hardware problem on the control. Typically the control will re−set itself. Replace
		communication problem with the (furnace con-	the control if the problem prevents operation and is persistent. The alarm/fault is cleared 300 sec-
		trol board, air−handler control board or outdoor	onds after the fault recovers.
		unit control board).
130	Moderate	(Air Handler) An air−handler configuration jump-	Configuration jumper(s) missing on control (applicable in non−communicating applications only).
		er is missing.	Replace the jumper or put wire between terminals on control. Cleared after jumper is connected.
131	Critical	(Stat / Furnace / Air Handler / Outdoor Unit) The	Reconfigure the system. Replace the control if heating or cooling is not available.
		(stat, furnace, air−handler or outdoor unit) con-
		trol parameters are corrupted.
132	Critical	(Air Handler) The air handler control software is	Recycle power. If failure re−occurs, replace the control. System reset is required to recover.
		corrupted.
			table continued on next page

Page 47 icomfort Wi-Fit 7−Day Programmable Communicating Thermostat