2017 Lennox Industries Inc.
Dallas, Texas, USA
ATTENTION SERVICE PERSONNEL
AIR HANDLER CONTROL SET-UP
PLEASE KEEP WITH UNIT FOR FUTURE USE!
7-SEGMENT DISPLAY AND CONFIGURATION
GUIDE
Refer to unit installation instruction for configuring unit size code
and electric heat.
Unit Size Codes For Air Handlers
Unit
Size
Code
Air Handler
Model
Unit
Size
Code
Air Handler
Model
Unit
Size
Code
Air Handler
Model
0 CBX32MV-018,
-024
6 CBX40UHV-024 A CBA38MV-018,
-024
1 CBX32MV-024,
-030
7 CBX40UHV-030 C
CBA38MV-030
2 CBX32MV-036 8 CBX40UHV-036 E
CBA38MV-036
3 CBX32MV-048 9 CBX40UHV-042 F
CBA38MV-042
4 CBX32MV-060 L CBX40UHV-048 H
CBA38MV-048
5 CBX32MV-068 U CBX40UHV-060 Y
CBA38MV-060
Code Action
Power-
Up
Unit Size Code (number or letter) represents air handler
model size and capacity. Refer to Unit Size Codes For Air
Handlers table above. If three horizontal bars are
displayed, AHC does not recognize size and capacity.
Idle mode — decimal blinks at 1 Hertz > 0.5 second ON, 0.5
second OFF. Idle mode is when the system is energized but
no demand.
A
Cubic feet per minute (CFM) setting for indoor blower - 1
second ON, 0.5 second OFF > CFM setting for current
mode displayed.
C
Cooling stage — 1 second ON, 0.5 second OFF > 1 or 2
displayed > pause > CFM setting displayed > pause >
repeat codes) .
d
Dehumidification mode — 1 second ON > pause > CFM
setting displayed > pause > repeat codes.
d F Defrost Mode
H
Heat Stage is 1 second ON, 0.5 second OFF > 1 or 2
displayed > pause > CFM setting displayed > pause >
repeat codes. Electric heat available in 1 to 5 stages.
h Stage heat pump (shows active heat pump stages, h1 or h2)
U
Discharge air sensor temperature (discharge air sensor
must be installed, properly configured and indoor blower
must be operating).
Code Action
Indoor Blower Test
A
Release push button — Control cycles indoor blower on for 10
seconds at 70% of maximum air for selected capacity size
unit. Control will automatically exit Field Test Mode.
Error Code Recall Mode (Note - control must be in idle mode)
E E
To enter Error Code Recall Mode, push and hold but
ton until solid E appears, then release button. AHC
will display up to 10 error codes stored in memory. If
E000 is displayed, there are no stored error codes.
Solid
-
-
-
To exit Error Code Recall Mode push and hold button
until solid three horizontal bars appear, then release
button.
Note - Error codes are not cleared.
Solid c
To clear error codes stored in memory, continue to
hold push button while the three horizontal bars are
displayed. Release push button when solid c is
displayed.
Blink
ing
c
Push and hold for one (1) second, release button.
Seven-segment will display 0000 and exit error recall
mode.
Error Status of Air Handler
E105
The air-handler has lost communication with the rest of the
system. Check for mis-wired and/or loose connections be
tween the thermostat, indoor unit and outdoor unit. Check for a
high voltage source of noise close to the system. This is a self-
recoverable error.
E114
There is a frequency/distortion problem with the power to the
air-handler. Check the voltage and line power frequency
E115
The 24VAC to the air-handler control is lower than the required
range of 18 to 30VAC. Check the voltage and line power fre
quency.
E120
There is a delay in the air-handler responding to the system.
Check all wiring connections.
E124
The iComfort thermostat has lost communication with the air-
handler for more than 3 minutes. Check the wiring connec
tions, ohm wires and cycle power.
E130 An air-handler configuration jumper is missing.
E131
The air-handler control parameters are corrupted. Replace
control.
E132
The air-handler control software is corrupted. Replace con
trol.
E180
The iComfort thermostat has found a problem with the air-
handler outdoor sensor. Compare outdoor sensor resistance
to temperature/resistance charts in unit installation instruc
tions. Replace sensor pack if necessary.
E201
The system has lost communication with the air-handler in
door blower motor. Check for loose wiring.
E202
The unit size code for the air-handler and the size of blower
motor do not match. Reconfigure control.
E203
The unit size code for the air-handler has not been selected.
Configure unit size code.
E292
The air-handler's blower motor will not start. Check for seized
bearing, stuck wheel, obstruction etc.
E295
The indoor blower motor is overheating. Check motor bear
ings and amps. Replace if necessary.
E310
There is a problem with air-handler discharge air sensor.
Compare outdoor sensor resistance to temperature
/resistance charts in installation instructions. Replace sensor
if necessary.
E312
The blower cannot provide the requested CFM due to high
static. Check filter and duct system.
E313 The indoor and outdoor unit capacities do not match.
E345
The O relay on the air-handler has failed. Either the pilot relay
contacts did not close or the relay coil did not energize.
E346 The R to O jumper was not removed on the air-handler control.
E347
The Y1 relay on the air-handler has failed. Either the pilot relay
contacts did not close or the relay coil did not energize.
E348
The Y2 relay on the air-handler has failed. Either the pilot relay
contacts did not close or the relay coil did not energize.
E350 The air-handler's electric heat is not configured.
E351
There is a problem with the air-handler's first-stage electric
heat. Either the pilot relay contacts did not close, or the relay
coil in the electric heat section did not energize.
E352
There is a problem with the air-handler's second-stage elec
tric heat. Either the pilot relay contacts did not close, or the
relay coil in the electric heat section did not energize. The air-
handler will operate on first-stage electric heat until the issue
is resolved.
E353
There is a problem with the air-handler's third-stage electric
heat. Either the pilot relay contacts did not close, or the relay
coil in the electric heat section did not energize. The air-han
dler will operate on first-stage electric heat until the issue is re
solved.
E354
There is a problem with the air-handler's fourth-stage electric
heat. Either the pilot relay contacts did not close, or the relay
coil in the electric heat section did not energize. The air-han
dler will operate on first-stage electric heat until the issue is re
solved.
E355
There is a problem with the air-handler's fifth-stage electric
heat. Either the pilot relay contacts did not close, or the relay
coil in the electric heat section did not energize. The air-han
dler will operate on first -stage electric heat until the issue is
resolved.
E409
The secondary voltage for the air-handler has fallen below
18VAC. If this continues for 10 minutes, the iComfort thermo
stat will turn off the air-handler.
See unit installation instruction or information manual for details on
clearing the alarms.
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