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 223	Low pressure switch failed open.	Check pressure (inches w.c.) of low pressure switch
		closing on heat call. Measure operating pressure
		(inches w.c.). Inspect vent and combustion air in-
		ducer for correct operation and restriction. Re-
		sumes normal operation after fault is cleared
E 224	Low pressure switch failed closed − Refer to troubleshooting. See	Check operation of low pressure switch to see if it is
	Page 56.	stuck closed on heat call longer than 150 seconds.
		Measure operating pressure (inches w.c.). Inspect
		vent and combustion air inducer for correct opera-
		tion and restriction. Resumes normal operation after
		fault is cleared.
E 225	High pressure switch failed open − Refer to troubleshooting. See	Check pressure (inches w.c.) of high pressure
	Page 56.	switch closing on heat call. Measure operating pres-
		sure (inches w.c.). Inspect vent and combustion air
		inducer for correct operation and restriction. Re-
		sumes normal operation after fault is cleared.
E 226	High pressure switch failed closed − Refer to troubleshooting. See	Check operation of high pressure switch closing on
	Page 56.	heat call. Measure operating pressure (inches w.c.).
		Inspect vent and combustion air inducer for correct
		operation and restriction. Resumes normal opera-
		tion after fault is cleared.
E 227	Low pressure switch open during trial for ignition or run mode. Refer to	Check pressure (inches w.c.) of low pressure switch
	troubleshooting. See Page 56.	closing on heat call. Measure operating pressure
		(inches w.c.). Inspect vent and combustion air in-
		ducer for correct operation and restriction. Re-
		sumes normal operation after fault is cleared.
E 228	Combustion air inducer calibration failure	Unable to perform pressure switch calibration.
		Check vent system and pressure switch wiring con-
		nections. Resumes normal operation after fault is
		cleared.
E 229	Ignition on high fire	IFC switched to high fire ignition because low fire
		pressure switch did not close in allowed time. No
		action is needed.
E 240	Low flame current − Run mode − Refer to troubleshooting. See Page 56.	Check micro−amperes of flame sensor using control
		diagnostics or field−installed mode. Clean or replace
		sensor. Measure voltage of neutral to ground to en-
		sure good unit ground. Alert clears after current
		heat call has been completed.
E 241	Flame sensed out of sequence − Flame still present.	Shut off gas. Check for gas valve leak. Replace, if
		necessary. Alert clears when fault is recovered.
E 250	Limit switch circuit open − Refer to troubleshooting.	Check for proper firing rate on furnace. Ensure
		there is no blockage in heater. Check for proper air
		flow. If limit not closed within 3 minutes, unit will go
		into 1−hour soft lockout. Resumes normal operation
		after fault is cleared.
E 252	Discharge air temperature too high (gas heat only).	Check temperature rise, air flow and input rate.
		Cleared when heat call is finished.
E 270	Soft lockout − Exceeded maximum number of retries. No flame current	Check for proper gas flow. Ensure that ignitor is
	sensed.	lighting burner. Check flame sensor current. Clears
		when heat call finishes successfully.
E 271	Soft lockout − Exceeded maximum number of retries. Last retry failed due	Check pressure (inches w.c.) of low pressure switch
	to the pressure switch opening.	closing on heat call. Measure operating pressure
		(inches w.c.). Inspect vent and combustion air in-
		ducer for correct operation and restriction. Clears
		when heat call finishes successfully.

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