Lennox A98USMV Installation Instructions Manual page 60

Code Diagnostic Codes / Status of Equipment
E125 Control failed self-check, internal error, failed
hardware. Will restart if error recovers, Integrated
control not communicating Covers hardware errors
(flame sense circuit faults, pin shorts, etc).
E126 Control internal communication problem.
E131 Corrupted control parameters (Verify configuration
of system) (Communicating systems only).
E180 Outdoor air temperature sensor failure. Only shown
if shorted or out of range (Communicating systems
only)
E200 Hard Lock out - Rollout circuit open or previously
open
E201 Indoor blower/communication failure - Unable to
communicate with blower motor
E202 Indoor blower motor mismatch - indoor motor
horsepower does not match unit capacity
E203 Appliance capacity size is NOT programmed.
Invalid unit codes. Refer to configuration flow chart.
E204 Gas valve mis-wired
E205 Gas valve control relay contact shorted
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Action Required to Clear and Recover
Hardware problem on the control. Cycle power on
control. Replace if problem prevents service and is
persistent. Cleared 300 seconds after fault recovered.
Hardware problem on the control. Cycle power on
control. Replace if problem prevents service and is
persistent. Cleared 300 seconds after fault recovered.
Reconfigure the system. Replace control if heating
or cooling is not available. Only applicable in the
communicating mode not in startup. Exit from
Commissioning and Execute Se+ factory Default mode.
Control will still operate on default parameter settings.
Compare outdoor sensor resistance to temperature
resistance 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
configuration 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 temperature 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
outage. 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 Code for Furnace/
Air Handler on configuration guide or in installation
instructions. Cleared after the correct match is detected
following a reset. (Remove thermostat from system
while applying power and reprogramming)
No appliance capacity code selected. Check for proper
configuring under Unit Size Codes for Furnace on
configuration guide or in installation instruction. Critical
Alert Cleared after valid unit code is read following a
reset (remove thermostat 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.
Issue 2346 508364-01