Lennox EIM - Page 21

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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
345
Service
Urgent
Relay O Failure
The O relay on the system component has failed. Either the pilot relay contacts did not close or the relay coil did
not energize.
Possible O relay / stage 1 failure.
Pilot relay contacts did not close or the relay coil did not energize.
Replace system component (device) control.
If error is applicable to the XC20, XC25, XP20 or XP25, the outdoor control will need to be replaced.
Automatically clears after
the fault recovered following
reset.
347
Service
Urgent
ID or EIM Relay
Y1 Fault
Lennox communicating thermostat sends a Y1 compressor demand to the indoor control requesting it to relay the
demand to the outdoor unit.
The indoor unit communicating control will verify the presences of 24VAC between the Y1 and C on its terminals.
If it does not detects the presences 24VAC, it will trigger alert code 347.
Possible cause for alert code 347 is Y1 relay on the applicable system component has failed. Either the furnace
pilot relay contacts did not close or the relay coil did not energize.
System operation will stop.
Possible Y1 relay / stage 1 failure.
Furnace pilot relay contacts did not close or the relay coil did not energize.
NOTE: There is no input back to the applicable system component control.
Automatically clears
after reset and Y1 input
sensed.
380
Service
Urgent
EIM Interlock
Relay Fault
Interlock relay failure (furnace or air handler modes only).
Interlock relay is energized, but input is not sensed after three seconds.
There will be no heating or cooling due to this alert code – moderate condition.
De-energize interlock relay and energize after ve minutes if demand is still present – critical condition.
Automatically clears after
fault recovered.
381
Service
Urgent
EIM Interlock
Relay Stuck
Interlock relay stuck (furnace or air handler modes only).
Interlock relay continuously sensed (with relay o󰀨).
There is no heating and cooling operation – moderation condition.
After 10 minutes if event still exist it will be escalated to priority condition service urgent.
Automatically clears 30
seconds after fault clears.
382
Service
Urgent
EIM Relay W1
Fault
Relay W1 failure (furnace or air handler modes only). W1 relay is energized but input is not sensed after three
seconds.
Automatically clears when
W1 relay input is sensed.