Lennox DAVE SIGNATURE SL280DFV Installation Instructions Manual page 49

Integrated Control Diagnostic Codes
Code Diagnostic Codes/Status of Equipment
E271 Soft lockout - Exceeded maximum number of re-
tries. Last retry failed due to the pressure switch
opening.
E272 Soft lockout - Exceeded maximum number of re-
cycles. Last recycle due to the pressure switch
opening.
E273 Soft lockout - Exceeded maximum number of re-
cycles. Last recycle due to flame failure.
E274 Soft lockout - Exceeded maximum number of re-
cycles. Last recycle failed due to the limit circuit
opening or limit remained open longer than 3 min-
utes
E275 Soft lockout - Flame sensed out of sequence.
Flame signal is gone.
E290 Ignitor circuit fault - Failed ignitor or triggering cir-
cuitry.
E292 Indoor blower motor unable to start due to ob-
structed wheel, seized
bearings.
E295 Indoor blower motor temperature is too high.
E310 Discharge error temperature sensor failure. Only
shown if shorted or
out of range.
E311 Heat rate reduced to match indoor blower air flow. Warning Only. Furnace blower in cutback mode due to
Action Required to Clear and Recover
Check pressure (inches w.c.) of low pressure switch clos-
ing on heat call. Measure operating pressure (inches w.c.).
Inspect vent and combustion air inducer for correct oper-
ation and restriction. Clears when heat call finishes suc-
cessfully.
Check operation of low pressure switch 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 (inches w.c.). Inspect vent and combustion air
inducer for correct operation and restriction. Clears when
heat call finishes successfully.
Check micro-amperes of flame sensor using control diag-
nostics or field-installed mode. Clean or replace sensor.
Measure voltage of neutral to ground to ensure good unit
ground. Clears when heat call finishes successfully.
Shut down system. 1-hour soft lockout. Check firing rate
and air flow. Check for blockage. Clears when heat call
finishes successfully.
Shut off gas. Check for gas valve leak. 1-hour soft lockout.
Clears when flame has been proven stable.
Measure resistance of hot surface ignitor. Replace if open
or not within specifications. 1-hour soft lockout. Clears
when flame has been proven stable.
Indoor blower motor unable to start (seized bearing, stuck
wheel, etc.). Replace motor or wheel if assembly does not
operate or meet performance standards. 1-hour soft lock-
out. Clears after circulator successfully starts.
Indoor blower motor over temperature (motor tripped on
internal protector). Check motor bearings and amps. Re-
place if necessary. Cleared after blower demand is satis-
fied.
Compare outdoor sensor resistance to temperature/ re-
sistance charts in installation instructions. Replace sensor
if necessary. Cleared in Communicating mode: 30 sec-
onds after fault recovered. In Non- Communicating mode:
Cleared after the current heat call is completed.
restricted airflow. Reduce firing rate every 60 seconds to
match available CFM. Check filter and duct system. To
clear, replace filter if needed or repair/ add duct. 2-stage
controls will reduce firing rate to 1st stage. Clears when
heat call finishes successfully.
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