Lennox EL296UH045XE36B Unit Information page 12

E 125 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.).
E 200 Hard lockout - Rollout circuit open or previously open.
E 204 Gas valve mis-wired.
E 205 Gas valve control relay contact shorted.
E 206 Gas valve second-stage relay failure
E 207 Hot surface ignitor sensed open
E 223 Low pressure switch failed open.
E 224 Low pressure switch failed closed.
E 225 High pressure switch failed open.
E 226 High pressure switch failed closed.
E 227 Low pressure switch open during trial for ignition or run mode.
E 229 Ignition on High Fire - Information Only.
E 240 Low flame current - Run mode.
E 241 Flame sensed out of sequence - Flame still present.
E 250 Limit switch circuit open.
TABLE 4 Continued
Page 12
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.
st
Furnace will operate on 1 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 in­
ducer for correct operation and restriction. Re­
sumes normal operation after fault is cleared
Check operation of low pressure switch to see if it is
stuck closed on heat call longer than 150 seconds.
Measure operating pressure (inches w.c.). Inspect
vent and combustion air inducer for correct opera­
tion and restriction. Resumes normal operation after
fault is cleared.
Check pressure (inches w.c.) of high pressure
switch closing on heat call. Measure operating pres­
sure (inches w.c.). Inspect vent and combustion air
inducer for correct operation and restriction. Re­
sumes 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 opera­
tion 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 in­
ducer for correct operation and restriction. Re­
sumes 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.