73
Table 19. 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
Inverter
Flash
Code
Priority
Condition
Actual Displayed
Alert Text
Under dealer
control center >
Notifications
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.
346
Service
Urgent
AH HP Jumper
Not Removed
The heat pump configuration link is not cut on the air handler control.
•
Configuration link not cut on air handler control.
• Cut
O
to
R
.
NOTE:
This is only applicable when matching non-communicating heat pump with Lennox
communicating indoor unit.
Automatically clears when the
system detects that the issue no
longer exists.
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.
348
Service Soon
ID Relay Y2
Fault
Possible cause for alert code 348 is
Y2
relay on the applicable system component may have
failed. Lennox communicating thermostat sends a
Y2
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 348. Either the furnace pilot relay contacts did not close
or the relay coil did not energize.
• Possible
Y2
relay / stage 2 failure.
• Furnace pilot relay contacts did not close or the relay coil did not energize.
• No input back to furnace or air handler control.
Automatically clears when the
system detects that the issue no
longer exists.
349
Service
Urgent
GF IFC Error
Check Jumper
O To R
• Only applicable in non-communicating mode.
• The
O
to
R
link on the furnace has been cut and could possibly cause a brown out.
•
Might also result in low voltage to which would generate alert code as well.
•
Configuration link
R
to
O
needs to be restored. Will need to restore link by hard-wiring the
R
to
O
terminals on the terminal strip.
Automatically clears when the
system detects that the issue no
longer exists.
