Lennox SLP98UHV Installation Instructions Manual page 57

Integrated Control Diagnostic Codes (continued)
Code
E 223
Low pressure switch failed open − Refer to troubleshooting in installation instruc-
tion.
E 224
Low pressure switch failed closed − Refer to troubleshooting in installation instruc-
tion.
E 225
High pressure switch failed open − Refer to troubleshooting in installation instruc-
tion.
E 226
High pressure switch failed closed − Refer to troubleshooting in installation instruc-
tion.
E 227
Low pressure switch open during trial for ignition or run mode. Refer to trouble-
shooting in installation instruction.
E 228
Unable to perform successful pressure switch calibration.
E 240
Low flame current − Run mode − Refer to troubleshooting in installation instruction. Check micro amperes of flame sensor, clean or replace
E 241
Flame sensed out of sequence − Flame still present.
E 250
Limit switch circuit open − Refer to troubleshooting in installation instruc-
tion.
E 252
Discharge air temperature too high (gas heat only).
E 270
Soft lockout − Exceeded maximum number of retries. No flame current
sensed.
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 from code 241 fault. Flame
signal is gone.
E 276
Soft lockout − Exceeded maximum number of calibration retries.
E 290
Ignitor circuit fault − Failed ignitor or triggering circuitry.
E 291
Restricted air flow − Cubic feet per minute is lower than what is needed
for minimum firing rate.
E 292
Indoor blower motor unable to start − Seized bearings, stuck wheel, etc.
E 294
Combustion air inducer motor amp draw is too high.
Diagnostic Codes/Status of Equipment
Check inches of water column pressure during operation
of low pressure switch on heat call, measure inches of
water column of operating pressure, inspect vent and com-
bustion air inducer for correct operation and restriction.
Check low pressure switch for closed contacts, measure
inches of water column of operating pressure, inspect vent
and combustion air inducer for correct operation and re-
striction.
Check inches of water column pressure of high pressure
switch on heat call, measure inches of water column of
operating pressure, inspect vent and combustion air induc-
er for correct operation and restriction.
Check high pressure switch for closed contacts, measure
inches of water column of operating pressure, inspect vent
and combustion air inducer for correct operation and re-
striction.
Check inches of water column pressure during operation
of low pressure switch on heat call, measure inches of
water column of operating pressure, inspect vent and com-
bustion air inducer for correct operation and restriction.
Retry after 300 seconds. Error counter cleared when exit-
ing lockout, unable to perform pressure switch calibration.
Check vent system and pressure switch wiring connec-
tions.
sensor. Measure voltage of neutral to ground for good unit
ground.
Shut off gas, check for gas valve leak.
Check why limit is tripping, overfired, low air flow.
Check temperature rise, air flow and input rate.
Check for gas flow, ignitor lighting burner, flame
sensor current.
See E 223.
See E 223 and E 225.
See E 240.
See E 250.
See E 241.
See E 228.
See E 207.
Check for dirty filter, unit air flow restriction, blower
performance.
Indoor blower motor unable to start (seized bearing,
stuck wheel, etc), replace motor or wheel if assem-
bly does not operate or meet performance.
Check combustion blower bearings, wiring , am-
peres, replace if it does not operate or meet perfor-
mance.
Page 57
Action Required to Clear and Recover