Lennox Allied Air Enterprise A97DSMV Installation Instructions Manual page 59

Code Diagnostic Codes / Status of Equipment
E105 Device communication problem - No other devices
on RS BUS (Communication system).
E110 Low line voltage.
E113 High line voltage.
E114 Line voltage frequency out-of-range.
E115 Low 24V - Control will restart if the error recovers.
E120 Unresponsive device (Communicating systems
only).
E124 Active communicating thermostat signal missing
for more than 3 minutes (Communicating systems
only).
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).
507029-05
Action Required to Clear and Recover
Equipment is unable to communicate. Indicates
numerous message errors. In most cases, errors are
related to electrical noise. Make sure high voltage
power is separated from RSBus. Check for mis-wired
and/or loose connections between the stat, indoor
unit, and outdoor unit. Check for a high voltage
source of noise close to the system. Fault clears after
communication is restored.
Line Voltage low (Voltage tower than nameplate rating).
Check power line voltage and correct. Alarm clears 5
seconds after fault recovered.
Line Voltage high (Voltage higher than nameplate
rating). Provide power voltage within proper range.
System resumes normal operation 5 seconds after fault
recovered.
No 60 Hertz power. Check voltage and line power
frequency. Correct voltage and frequency problems.
System resumes normal operation 5 seconds after fault
recovered.
24 Volt Power high (Range is 18 to 30 Volts). Check
and correct voltage. Check for additional power
robbing equipment connected to system. May require
installation of larger VA transformer to be installed in
furnace/air handler. Clears after fault recovered.
Usually caused by delay in outdoor unit responding
to indoor unit poling. Recycle power. Check all wiring
connections. Cleared after unresponsive device
responds to any inquiry.
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)
message is received.
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.
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