Lennox EIM - Page 20

20
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), PA=Pure Air S, ZA=Zone system and
TS=Thermostat
Alert
Code
Priority
Condition
Actual Displayed
Alert Text
Under dealer
control center >
Notications
Component or System Operational State and Troubleshooting Tip
How to clear
alert code
125
Service
Urgent
Control
Hardware
Problem
There is a hardware problem on a system component control. There is a control hardware problem.
In system using iHarmony zoning, the system will remain in non-zone mode (all dampers open) for ve minutes
after priority condition no longer exist.
In systems using a Equipment Interface Module, remove jumper if present on indoor unit between R and W2.
In systems using a PureAir S, the pure air control board jumper selector is missing.
If none of the above tips are applicable, then replace the control if the problem prevents operation and is
persistent.
Automatically clears ve
minutes after the issue no
longer exists.
132
Service
Urgent
Device Control
Software Fault
System component control software is corrupted.
Recycle power.
If failure re-occurs, replace the system component control.
Manual system power reset
is required to recover from
this alert code.
180 Service Soon
Outdoor
Temperature
Sensor Problem
The thermostat has found a problem with the outdoor temperature sensor. In normal operation after system
component control recognizes sensors, the alert code will be sent if valid temperature reading is lost.
Compare outdoor sensor resistance to temperature / resistance charts in unit installation instructions. Replace
sensors pack if necessary.
At the beginning of (any) conguration, furnace, air-handler control or equipment interface module will detect the
presence of the sensor(s).
If detected (reading in range), appropriate feature will be set as ‘installed’ and shown in the ‘About’ screen.
Automatically clears upon
conguration, or sensing
normal values.
310 Service Soon
Discharge Air
Temp Sensor
Problem
There is a discharge air temperature sensor issue.
Conrm there is no short or open circuits in the Lennox communicating thermostat connections to any of the other
components in the communication system.
Compare discharge air temperature sensor (DATS) resistance to temperature / resistance charts in system
component installation instruction.
Replace discharge air sensor if necessary.
NOTE: Issues with a DATS connected to a damper control module or equipment interface model will not
generate an alert code.
Automatically clears 30
seconds after condition is
detected as recovered or
after system restart.