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Code
Diagnostic Codes / Status of Equipment
E225
High pressure switch failed open -Refer to
troubleshooting
E226
High pressure switch failed closed -Refer to
troubleshooting
E227
Low pressure switch open during trial for ignition or
run mode. Refer to troubleshooting
E228
Combustion air inducer calibration failure
E229
Ignition on high fire
E240
Low flame current - Run mode- Refer to
troubleshooting
E241
Flame sensed out of sequence-Flame still present.
E250
Limit switch circuit open - Refer to troubleshooting.
E252
Discharge air temperature too high (gas heat only).
E270
Soft lockout - Exceeded maximum number of
retries. No flame current sensed.
E271
Soft lockout - Exceeded maximum number of
retries. Last retry failed due to the pressure switch
opening.
E272
Soft lockout - Exceeded maximum number of
recycles. Last recycle due to the pressure switch
opening
507029-05
Action Required to Clear and Recover
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 operation and restriction Resumes normal
operation after fault is cleared.
Check operation of high pressure closing on heat call.
Measure operating pressure (inches w.c.). Inspect vent
and combustion air inducer for correct operation and
restriction. Resumes normal operation after fault is
cleared.
Check operation of low pressure switch closing on heat
call. Measure operating pressure (inches w.c.). Inspect
vent and combustion air inducer for correct operation
and restriction. Resumes normal operation after fault is
cleared.
Unable to perform pressure switch calibration. Check
vent system and pressure switch wiring connections.
Resumes normal operation after fault is cleared
IFC switched to high fire ignition because low fire
pressure switch did not close in allowed time. No action
is needed.
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. Alert clears after current heat all has
been completed.
Shut off gas. Check for gas valve leak. Replace if
necessary. Alert clears when fault is recovered.
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.
Check temperature rise airflow and input rate. Clear
when heat call is finished.
Check for proper gas flow. Ensure that igniter is lighting
burners. Check flame sensor current. Clears when heat
call finishes successfully.
Check pressure (inches w.c.) of low pressure switch
closing on heat call. Measure operating pressure
(inches w.c.). Inspect vent and combustion air inducer
for correct operation and restriction. Clears when heat
call finishes successfully.
Check operation of low pressure 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. Inspect vent and combustion air
inducer for correct operation and restriction. Clears
when heat call finishes successfully.
Issue 2241
Page 61 of 73
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