Lennox International Inc DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE, SL280DFV

Integrated Control Diagnostic Codes (continued)

Code	Diagnostic Codes/Status of Equipment	Action Required to Clear and Recover
E 105	Device communication problem − No other devices on RS BUS (Commu-	Equipment is unable to communicate. Indicates
	nication	numerous message errors. In most cases errors are
	system).	related to electrical noise. Make sure high voltage
		power is separated from RSBus. Check for mis−
		wired and/or loose connections between the stat,
		indoor unit and outdoor unit. Check for a high volt-
		age source of noise close to the system. Fault
		clears after communication is restored.
E 110	Low line voltage.	Line Voltage Low (Voltage lower than nameplate
		rating). Check power line voltage and correct. Alarm
		clears 5 seconds after fault recovered.
E 111	Line voltage polarity reversed.	Reverse line power voltage wiring. System resumes
		normal operation 5 seconds after fault recovered.
E 112	Ground not detected	System shuts down. Provide proper earth ground.
		System resumes normal operation 5 seconds after
		fault recovered.
E 113	High line voltage.	Line Voltage High (Voltage higher than nameplate
		rating). Provide power voltage within proper range.
		System resumes normal operation 5 seconds after
		fault recovered.
E 114	Line voltage frequency out−of−range.	No 60 Hertz Power. Check voltage and line power
		frequency. Correct voltage and frequency problems.
		System resumes normal operation 5 seconds after
		fault recovered.
E 115	Low 24V − Control will restart if the error recovers.	24−Volt Power Low (Range is 18 to 30 volts). Check
		and correct voltage. Check for additional power−rob-
		bing equipment connected to system. May require
		installation of larger VA transformer to be installed in
		furnace / air handler. Clears after fault recovered.
E 116	High 24V.	24 Volt Power High (Range is 18 to 30 volts). Check
		and correct voltage. Check for proper line voltage
		(120V, 240V, etc.) to equipment. Clears when con-
		trol senses proper voltage.
E 117	Poor ground detected (Warning only)	Provide proper grounding for unit. Check for proper
		earth ground to the system. Warning only will clear
		30 seconds after fault recovered.
E 120	Unresponsive device. Communication only.	Usually caused by delay in outdoor unit responding
		to indoor unit poling. Recycle power. Check all wir-
		ing connections. Cleared after unresponsive device
		responds to any inquiry.
E 124	Active communicating thermostat signal missing for more than 3 min-	Equipment lost communication with the thermostat.
	utes.	Check four wiring connections, ohm wires and cycle
		power at the thermostat. Alert stops all services and
		waits for heartbeat message from thermostat (sub-
		net controller). Cleared after valid thermostat (sub-
		net controller) message is received.
E 125	Control failed self−check, internal error, failed hardware. Will restart if	Hardware problem on the control. Cycle power on
	error	control. Replace if problem prevents service and is
	recovers. Integrated control not communicating. Covers hardware errors	persistent. Critical alert. Cleared 300 seconds after
	(flame sense circuit faults, pin shorts, etc.).	fault recovered.
E 126	Control internal communication problem.	Hardware problem on the control. Cycle power on
		control. Replace if problem prevents service and is
		persistent. Cleared 300 seconds after fault recov-
		ered.

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