508033-02Issue 2135Page 14 of 48
Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover
E274 Soft lockout - Exceeded maximum number
of recycles. Last recycle failed due to the
limit circuit opening or limit remained open
longer than 3 minutes
Shut down system. 1-hour soft lockout. Check ring rate and air ow. Check
for blockage. Clears when heat call nishes successfully.
E275 Soft lockout - Flame sensed out of
sequence. Flame signal is gone.
Shut o gas. Check for gas valve leak. 1-hour soft lockout. Clears when
ame has been proven stable.
E276 Watchguard calibration failure. Unable to perform pressure switch calibration. Check vent system and
pressure switch wiring connections. 1-hour soft lockout. Clears when
calibration has nished successfully.
E290 Ignitor circuit fault - Failed ignitor or
triggering circuitry.
Measure resistance of hot surface ignitor. Replace if open or not within
specications. 1-hour soft lockout. Clears when ame has been proven
stable.
E291 Heat air ow restricted below the minimum. Check for dirty lter and air ow restriction. Check blower performance.
1-hour soft lockout. Cleared when heat call nishes successfully.
E292 Indoor blower motor unable to start due to
obstructed wheel, seized
bearings.
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 lockout. Clears after circulator successfully starts.
E294 Combustion air inducer over current. Check combustion blower bearings, wiring and amps. Replace if does not
operate or does not meet performance standards. Clears after inducer
current is sensed to be in-range after the ignition following the soft lockout or
reset.
E295 Indoor blower motor temperature is too
high.
Indoor blower motor over temperature (motor tripped on internal protector).
Check motor bearings and amps. Replace if necessary. Cleared after blower
demand is satised.
E310 Discharge error temperature sensor failure.
Only shown if shorted or
out of range.
Compare outdoor sensor resistance to temperature/ resistance charts
in installation instructions. Replace sensor if necessary. Cleared in
Communicating mode: 30 seconds after fault recovered. In Non-
Communicating mode: Cleared after the current heat call is completed.
E311 Heat rate reduced to match indoor blower
air ow.
Warning Only. Furnace blower in cutback mode due to restricted airow.
Reduce ring rate every 60 seconds to match available CFM. Check lter
and duct system. To clear, replace lter if needed or repair/ add duct. 2-stage
controls will reduce ring rate to 1st stage. Clears when heat call nishes
successfully.
E312 Restricted air ow in cooling or continuous
fan mode is lower than cfm setting.
Warning Only. Restricted airow - Indoor blower is running at a reduced CFM
(Cutback Mode - The variable speed motor has pre-set speed and torque
limiters to protect the motor from damage caused by operating outside of
design parameters (0 to 0.8” W.C.. total external static pressure). Check lter
and duct system. To clear, replace lter if needed or repair/add duct. Cleared
after the current service demand is satised.
E313 Indoor or outdoor unit capacity mismatch.
Communication only.
Incorrect indoor/outdoor capacity code selected. Check for proper
conguring in installation instructions. Alarm is just a warning. The system
will operate, but might not meet eciency and capacity parameters. Alarm
will clear when commissioning is exited. Cleared after commissioning is
complete.
E331 Global network connection -
Communication link problem.
For Future Use.
E334 Relay “Y1” stuck on interated control. Replace integrated control.
E347 No 24 Volt output on Y1 of ”integrated
control” with non communicating outdoor
unit.
Operation stopped. Y1 relay / Stage 1 failed. (Pilot relay contacts did not
close or the relay coil did not energize; no input back to IFC chip). Critical
Alert. Cleared after reset and Y1 input sensed.
Table 5. Integrated Diagnostic Codes/Status of Equipment
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