Lennox EIM - Page 19

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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
120 Service Soon
Unresponsive
Device
There is a delay in the system component responding to the system. Typically this alert code does not cause
any operational issues and will clear on its own.
This alert code is usually caused by a delay in the outdoor unit responding to the thermostat.
Leaking voltage from strands within the bundle.
> Land only the R wire on the R terminal to load the bundle with 24VAC.
► Typically only the R wire needs to be landed to identify if voltage is leaking.
► If voltage is present checking the other wires is informational only but not needed.
► If voltage is not present checking the other wires one at a time would be needed.
> Check each loose wire in AC mode to C on circuit board.
► Good voltage is .03 -.3VAC leaking voltage is not the issue.
► Acceptable can be up to .7VAC with moderate success.
► Some units have worked with up to 1.2VAC with occasional success.
► Voltage over 1.2VAC needs to be addressed.
Automatically clears after
an unresponsive system
component (device)
responds to any inquiry.
124
Service
Urgent
Tstat Lost
Communication
To Smarthub
The thermostat has lost communication with a system component for more than three minutes. System
component has lost communication with the thermostat.
Check the wiring connections between components.
Ohm wires.
Cycle power.
Any component that is miss-wired may cause a false component code to be shown on system component.
Disconnect all wiring to other system components and check communication one at a time.
NOTE: When using a oat switch, use isolation relay to break common wire to outdoor unit. For testing
purposes, remove oat switch from the circuit
This alert code stops all associated system operations and waits for a heartbeat message from the system
component that is not communicating.
Automatically clears after
communication is re-
established with applicable
system component
(device).