Haier GE NF80XV Series Service Manual page 15

Code Diagnostic Codes / Status of Equipment
E290 Ignitor circuit fault - Failed ignitor or triggering
circuitry.
E291 Heat airflow restricted below the minimum.
E292 Indoor blower motor unable to start due to
obstructed wheel seized bearings.
E294 Combustion air inducer over current.
E295 Indoor blower motor temperature is too high.
E311 Heat rate reduced to match indoor blower airflow.
E312 Restricted airflow in cooling or continuous fan
mode is lower than CFM setting.
E334 Relay "Y1" stuck on integrated control.
E347 No 24 Volt output on Y1 of "integrated control"
with non-communicating outdoor unit.
E348 No 24 Volt output on Y2 of "integrated control"
with non-communicating outdoor unit.
E349 No 24 Volts between R & O on "integrated
control" with non-communicating outdoor
unit (dual fuel model required for heat pump
application).
E370 Interlock switch sensed open for 2 minutes.
31-5000734 Rev. 0
Action Required to Clear and Recover
Measure resistance of hot surface igniter. Replace if
open or not within specifications. 1-hour soft lockout.
Clears when flame has been proven stable.
Check for dirty filter and airflow restriction. Check blower
performance. 1-hour soft lockout. Cleared when heat call
finishes successfully.
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.
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.
Indoor blower motor over temperature (motor tripped
on internal protector). Check motor bearings and amps.
Replace if necessary. Cleared after blower demand is
satisfied.
Warning Only. Furnace blower in cutback mode due to
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 1-stage. Clears when
heat call finished successfully.
Warning Only. Restricted airflow - Indoor blower is
running at a reduced CFM (Cutback Mode - The variable
speed motor has preset 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 filter and duct system. To
clear, replace filter if needed or repair/add duct. Cleared
after the current service demand is satisfied.
Replace integrated control.
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.
Y2 relay/Stage 2 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.
Configuration link R to O needs to be restored. Replace
link or hardwire. Critical Alert.
Control sees the loss of 24VAC for 2 minutes. Terminate
all services and wait for interlock switch to close. The
alarm will clear when 24VAC is continuously sensed on
DS terminal for a minimum of 10 seconds or on a power
reset.
Page 15