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Code
Diagnostic Codes/Status of Equipment
E125
Control failed self-check, internal error,
failed hardware. Will restart if error recovers.
Integrated control not communicating. Covers
hardware errors (flame sense circuit faults, pin
shorts, etc.).
E200
Hard lockout - Rollout circuit open or previously
open.
E204
Gas valve mis-wired.
E205
Gas valve control relay contact shorted.
E206
Gas valve second-stage relay failure.
E207
Hot surface ignitor sensed open.
E223
Low pressure switch failed open.
E224
Low pressure switch failed closed.
E225
High pressure switch failed open.
E226
High pressure switch failed closed.
E227
Low pressure switch open during trial for
ignition or run mode.
E229
Ignition on High Fire - Information Only.
E240
Low flame current - Run mode.
E241
Flame sensed out of sequence - Flame still
present.
E250
Limit switch circuit open.
TABLE 4 Continued
Action Required to Clear and Recover
Hardware problem on the control. Cycle power on control. Replace
if problem prevents service and is persistent. Critical alert. Cleared
300 seconds after fault recovered.
Correct cause of rollout trip, or replace flame rollout switch. Test
furnace operation. Cleared after fault recovered.
Check gas valve operation and wiring. Clears when repaired.
Check wiring on control and gas valve. If wiring is correct, replace
control.
Furnace will operate on 1st stage for remainder of the heating
demand. Will clear after fault recovered. If unable to operate 2nd
stage, replace control.
Measure resistance of hot surface ignitor. Replace if open or not
within specified range found in IOM. Resumes normal operation
after fault is cleared.
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.
Resumes normal operation after fault is cleared.
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.
Resumes normal operation after fault is cleared.
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 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 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.
Resumes normal operation after fault is cleared.
Code is displayed if 1) low pressure switch fails to close, then
furnace will switch to high speed inducer to close both low and
high pressure switches, then furnace lights on high fire, or 2) if
continuous fan is active, furnace lights on high fire for 60 seconds
to improve heat exchanger warm up time.
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 call 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.
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