Lennox EL296UH045XE36B Unit Information page 13

E 270 Soft lockout - Exceeded maximum number of retries. No flame current
sensed.
Code Diagnostic Codes/Status of Equipment
E 271 Soft lockout - Exceeded maximum number of retries. Last retry failed due
to the pressure switch opening.
E 272 Soft lockout - Exceeded maximum number of recycles. Last recycle due
to the pressure switch opening.
E 273 Soft lockout - Exceeded maximum number of recycles. Last recycle due
to flame failure.
E 274 Soft lockout - Exceeded maximum number of recycles. Last recycle
failed due to the limit circuit opening or limit remained open longer than
3 minutes.
E 275 Soft lockout - Flame sensed out of sequence. Flame signal is gone.
E 290 Ignitor circuit fault - Failed ignitor or triggering circuitry.
TABLE 4 Continued
Page 13
Check for proper gas flow. Ensure that ignitor is
lighting burner. Check flame sensor current. Clears
when heat call finishes successfully.
Action Required to Clear and Recover
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. Clears
when heat call finishes successfully.
Check operation of low pressure switch to see if it is
stuck closed on heat call. Check pressure (inches
w.c.) of high pressure switch closing on heat call.
Measure operating pressure (inches w.c.). Inspect
vent and combustion air inducer for correct opera­
tion and restriction. Clears when heat call finishes
successfully.
Check micro-amperes of flame sensor using control
diagnostics or field-installed mode. Clean or replace
sensor. Measure voltage of neutral to ground to
ensure good unit ground. Clears when heat call
finishes successfully.
Shut down system. 1-hour soft lockout. Check firing
rate and air flow. Check for blockage. Clears when
heat call finishes successfully.
Shut off gas. Check for gas valve leak. 1-hour soft
lockout. Clears when flame has been proven stable.
Measure resistance of hot surface ignitor. Replace
if open or not within specifications. 1-hour soft lock­
out. Clears when flame has been proven stable.