Lennox DAVE SIGNATURE SL280DFV Installation Instructions Manual page 48

Integrated Control Diagnostic Codes
Code Diagnostic Codes/Status of Equipment
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.
E228 Combustion air inducer calibration failure
E229 Ignition on high fire
E240 Low flame current - Run mode.
E241 Flame sensed out of sequence - Flame still pres-
ent.
E250 Limit switch circuit open.
E252 Discharge air temperature too high (gas heat only). Check temperature rise, air flow and input rate. Cleared
E270 Soft lockout - Exceeded maximum number of re-
tries. No flame current sensed.
Action Required to Clear and Recover
Furnace will operate on 1st stage for remainder of the
heating demand. Will clear after fault recovered. If un-
able to operate 2nd stage, replace control.
Measure resistance of hot surface ignitor. Replace if
open or not within specified range found in IOM. Re-
sumes normal operation after fault is cleared.
Check pressure (inches w.c.) of low pressure switch
closing on heat call. Measure operating pressure (inch-
es w.c.). Inspect vent and combustion air inducer for
correct operation and restriction. Resumes normal op-
eration after fault is cleared
Check operation of low pressure switch to see if it is
stuck closed on heat call longer than 150 seconds. Mea-
sure operating pressure (inches w.c.). Inspect vent and
combustion air inducer for correct operation and restric-
tion. Resumes normal operation after fault is cleared.
Check pressure (inches w.c.) of high pressure switch
closing on heat call. Measure operating pressure (inch-
es w.c.). Inspect vent and combustion air inducer for
correct operation and restriction. Resumes normal op-
eration 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 (inch-
es w.c.). Inspect vent and combustion air inducer for
correct operation and restriction. Resumes normal op-
eration 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 pres-
sure 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 call has
been completed.
Shut off gas. Check for gas valve leak. Replace, if nec-
essary. 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.
when heat call is finished.
Check for proper gas flow. Ensure that ignitor is lighting
burner. Check flame sensor current. Clears when heat
call finishes successfully.
Page 48