Lennox EL296UHV Series Unit Information page 41

Ignition Control 107045-XX Diagnostic Modes
Code Diagnostic Codes/Status of Equipment
E124 Active communicating thermostat signal
missing for more than 3 minutes.
E125 Control failed self-check, internal error,
failed hardware. Will restart if error recov-
ers. Integrated control not communicating.
Covers hardware errors (flame sense cir-
cuit faults, pin shorts, etc.).
E131 Corrupted control parameters (Verify con-
figuration of system). Communicating only.
E150 A2L Refigerant leak alarm
E151 A2L Sensor fault (sensor problem) (com-
munication mode only)
E180 Outdoor air temperature sensor failure.
Only shown if shorted or out-ofrange.
E200 Hard lockout - Rollout circuit open or pre-
viously open.
E201 Indoor blower communication failure - Un-
able to communicate with blower motor.
E202 Indoor blower motor mis-match - Indoor
motor horsepower does not match unit ca-
pacity.
E203 Appliance capacity / size is NOT pro-
grammed. Invalid unit codes refer to con-
figuration flow chart.
E204 Gas valve mis-wired.
E205 Gas valve control relay contact shorted.
Action Required to Clear and Recover
Equipment lost communication with the thermostat. Check
four wiring connections, ohm wires and cycle power at the
thermostat. Alert stops all services and waits for heartbeat
message from thermostat (subnet controller). Cleared after
valid thermostat (subnet controller) message is received.
Hardware problem on the control. Cycle power on control.
Replace if problem prevents service and is persistent. Criti-
cal alert. Cleared 300 seconds after fault recovered.
Reconfigure the system. Replace control if heating or cool-
ing is not available. Only applicable in the communicating
mode, not in startup. Exit from Commissioning and Execute
'Set Factory Default mode Control will still operate on default
parameter settings
Compare outdoor sensor resistance to temperature/ resis-
tance charts in unit installation instructions. Replace sensor
pack if necessary. At beginning of (any) configuration, furnace
or air handler control will sense outdoor air and discharge
air temperature sensor(s). If detected (reading in range),
appropriate feature will be set as 'installed' and that could
be seen in 'About' screen. In normal operation after control
recognizes sensors, alarm will be sent if valid temperature
reading is lost. To get rid of setting and alarm, redo configu-
ration and make sure that temperature sensor is marked as
'not installed' in Indoor Unit 'About' screen. When Indoor unit
control is replaced, thermostat will 'tell' new control if tem-
perature sensor is in system or not. Clears 30 seconds after
fault recovered.
Correct cause of rollout trip, or replace flame rollout switch.
Test furnace operation. Cleared after fault recovered.
Indoor blower communication failure (including power out-
age). Lost communication with indoor blower motor. Possible
causes: motor not powered, loose wiring. Problem may be
on control or motor side. Cleared after fault recovered.
Incorrect appliance capacity code selected. Check for proper
configuring under: Unit Size Codes for Furnace/Air Handler
on configuration guide or in installation instructions. Cleared
after the correct match is detected following a reset. (Re-
move thermostat from system while applying power and re-
programming.)
No appliance capacity code selected. Check for proper con-
figuring under: Unit Size Codes for Furnace on configuration
guide or in installation instructions. Critical Alert. Cleared af-
ter valid unit code is read following a reset. (Remove thermo-
stat from system while applying power and reprogramming.)
Check gas valve operation and wiring. Clears when repaired.
Check wiring on control and gas valve. If wiring is correct,
replace control.
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