Page 25
Integrated Control Diagnostic Codes (continued)
Code
Diagnostic Codes/Status of Equipment
Action Required to Clear and Recover
Low pressure switch failed open − Refer to troubleshooting in installation instruc-
tion.
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.
Low pressure switch failed closed − Refer to troubleshooting in installation instruc-
tion.
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.
High pressure switch failed open − Refer to troubleshooting in installation instruc-
tion.
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.
High pressure switch failed closed − Refer to troubleshooting in installation instruc-
tion.
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.
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 com-
bustion air inducer for correct operation and restriction.
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 connec-
tions.
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.
Flame sensed out of sequence − Flame still present.
Shut off gas, check for gas valve leak.
Limit switch circuit open − Refer to troubleshooting in installation instruc-
tion.
Check why limit is tripping, overfired, low air flow.
Discharge air temperature too high (gas heat only).
Check temperature rise, air flow and input rate.
Soft lockout − Exceeded maximum number of retries. No flame current
sensed.
Check for gas flow, ignitor lighting burner, flame
sensor current.
Soft lockout − Exceeded maximum number of retries. Last retry failed due
to the pressure switch opening.
See E 223.
Soft lockout − Exceeded maximum number of recycles. Last recycle due
to the pressure switch opening.
See E 223 and E 225.
Soft lockout − Exceeded maximum number of recycles. Last recycle due
to flame failure.
See E 240.
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.
Soft lockout − Flame sensed out of sequence from code 241 fault. Flame
signal is gone.
See E 241.
Soft lockout − Exceeded maximum number of calibration retries.
See E 228.
Ignitor circuit fault − Failed ignitor or triggering circuitry.
See E 207.
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.
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 assem-
bly does not operate or meet performance.
Combustion air inducer motor amp draw is too high.
Check combustion blower bearings, wiring , am-
peres, replace if it does not operate or meet perfor-
mance.
