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 312	Restricted air flow in cooling or continuous fan mode is lower than cfm	Warning Only. Restricted airflow − Indoor blower is
	setting.	running at a reduced CFM (Cutback Mode − The
		variable speed motor has pre−set speed and torque
		limiters to protect the motor from damage caused
		by operating outside of design parameters (0 to 0.8"
		W.C.. total external static pressure). Check filter and
		duct system. To clear, replace filter if needed or re-
		pair/add duct. Cleared after the current service de-
		mand is satisfied.
E 313	Indoor or outdoor unit capacity mismatch. Communication only.	Incorrect indoor/outdoor capacity code selected.
		Check for proper configuring in installation instruc-
		tions. Alarm is just a warning. The system will oper-
		ate, but might not meet efficiency and capacity pa-
		rameters. Alarm will clear when commissioning is
		exited. Cleared after commissioning is complete.
E 331	Global network connection − Communication link problem.	For Future Use.
E 334	Relay	Replace integrated control.
E 347	No 24 Volt output on Y1 of "integrated control" with non communicating	Operation stopped. Y1 relay / Stage 1 failed. (Pilot
	outdoor unit.	relay contacts did not close or the relay coil did not
		energize; no input back to IFC chip). Critical Alert.
		Cleared after reset and Y1 input sensed.
E 348	No 24 Volt output on Y2 of "integrated control" with non?communicating	Y2 relay / Stage 2 failed. (Pilot relay contacts did
	outdoor unit.	not close or the relay coil did not energize; no input
		back to IFC chip). Critical Alert. Cleared after reset
		and Y1 input sensed.
E 349	No 24 Volts between R & O on "integrated control" with non communi-	Configuration link R to O needs to be restored. Re-
	cating outdoor unit (Dual fuel module required for heat pump application).	place link or hard−wire. Applicable in non communi-
		cating mode. Critical Alert.
E 370	Interlock switch sensed open for 2 minutes.	Control sees the loss of 24VAC for 2 minutes .Ter-
		minate all services and wait for interlock switch to
		close. The alarm will clear when 24VAC is continu-
		ously sensed on DS terminal for a minimum of 10
		seconds or on a power reset.
E 400	LSOM − Compressor internal overload tripped.	Thermostat demand Y1 is present; but, compressor
		is not running. Check power to outdoor unit. Clears
		the error after current is sensed in both RUN and
		START sensors for at least 2 seconds, or after ser-
		vice is removed, or after power reset.
E 401	LSOM Compressor long run cycle or low system pressure.	Compressor ran more than 18 hours to satisfy a
		single thermostat demand. Critical Alert. Clears the
		error after 30 consecutive normal run cycles or
		power reset. Also monitors low pressure switch
		trips.
E 402	LSOM − Outdoor unit system pressure trip.	Discharge or suction pressure out−of−limits, or com-
		pressor overloaded. Clears the error after 4 consec-
		utive normal compressor run cycles.
E 403	LSOM − Compressor short−cycling. .(Running less than 4 minutes). Out-	Compressor runs less than 3 minutes to satisfy a
	door unit pressure trip	thermostat demand. Clears the error after 4 consec-
		utive normal run cycles or power reset.
E 404	LSOM − Compressor rotor locked. Compressor short−cycling. (Running	Compressor rotor locked up due to run capacitor
	less than 4 minutes).	short, bearings are seized, excessive liquid refriger-
		ant, etc. Clears the error after 4 consecutive normal
		run cycles or after power reset.
E 405	LSOM − Compressor open circuit.	Compressor circuit open (due to power disconnec-
		tion, open fuse, etc.) Clears the error after 1 normal
		compressor run cycle.

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