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Page 54
Integrated Control Diagnostic Codes (continued)
Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover
E 223
Low pressure switch failed open − Refer to troubleshooting in installation
instruction.
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
combustion air inducer for correct operation and restric-
tion.
E 224
Low pressure switch failed closed − Refer to troubleshooting in installation
instruction.
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.
E 225
High pressure switch failed open − Refer to troubleshooting in installation
instruction.
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
inducer for correct operation and restriction.
E 226
High pressure switch failed closed − Refer to troubleshooting in installation
instruction.
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
restriction.
E 227
Low pressure switch open during trial for ignition or run mode. Refer to trouble-
shooting in installation instruction.
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
combustion air inducer for correct operation and restric-
tion.
E 228
Unable to perform successful pressure switch calibration. Retry after 300 seconds. Error counter cleared when exit-
ing lockout, unable to perform pressure switch calibration.
Check vent system and pressure switch wiring
connections.
E 240
Low flame current − Run mode − Refer to troubleshooting in
installation instruction.
Check micro amperes of flame sensor, clean or replace
sensor. Measure voltage of neutral to ground for good unit
ground.
E 241
Flame sensed out of sequence − Flame still present. Shut off gas, check for gas valve leak.
E 250
Limit switch circuit open − Refer to troubleshooting in installation instruction. Check why limit is tripping, overfired, low air flow.
E 252
Discharge air temperature too high (gas heat only). Check temperature rise, air flow and input rate.
E 270
Soft lockout − Exceeded maximum number of retries. No flame current sensed. Check for gas flow, ignitor lighting burner, flame sensor
current.
E 271
Soft lockout − Exceeded maximum number of retries. Last retry failed due to
the pressure switch opening.
See E 223.
E 272
Soft lockout − Exceeded maximum number of recycles. Last recycle due to the
pressure switch opening.
See E 223 and E 225.
E 273
Soft lockout − Exceeded maximum number of recycles. Last recycle due to
flame failure.
See E 240.
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.
See E 250.
E 275
Soft lockout − Flame sensed out of sequence from code 241 fault. Flame signal
is gone.
See E 241.
E 276
Soft lockout − Exceeded maximum number of calibration retries. See E 228.
E 290
Ignitor circuit fault − Failed ignitor or triggering circuitry. See E 207.
E 291
Restricted air flow − Cubic feet per minute is lower than what is needed for
minimum firing rate.
Check for dirty filter, unit air flow restriction, blower
performance.
E 292
Indoor blower motor unable to start − Seized bearings, stuck wheel, etc. Indoor blower motor unable to start (seized
bearing, stuck wheel, etc), replace motor or wheel if
assembly does not operate or meet performance.
E 294
Combustion air inducer motor amp draw is too high. Check combustion blower bearings, wiring , amperes,
replace if it does not operate or meet performance.