Lennox 11U61 Setup And Installation Manual page 33

Table 2. Alert Codes and Troubleshooting
Alert
Priority Alert Text
Code
(Furnace / Air Handler / Equipment
Interface Module) The "Y1" relay on
the (furnace or air­handler) has failed.
347 Critical
Either the pilot relay contacts did not
close or the relay coil did not ener­
gize.
(Furnace / Air Handler) The "Y2" relay
on the (furnace or air­handler) has
348 Critical failed. Either the pilot relay contacts
did not close or the relay coil did not
energize.
(Equipment Interface Module) Inter­
Moderate
380 lock relay failure (IFC or AHC mode
/ Critical
only)
(Equipment Interface Module) Inter­
Moderate
381 lock relay stuck (IFC or AHC modes
/ Critical
only)
(Equipment Interface Module) Relay
382 Moderate
W1 failure (IFC and AHC modes only)
(Outdoor Unit) The "W" output termin­
420 Critical al on the outdoor unit is not wired cor­
rectly
(Equipment Interface Module) Pre­coil
discharge air temperature sensor
Moderate
problem (DFM mode only). Advances
594
/ Critical
from moderate to critical after ten (10)
minutes.
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.
Steps to clear
Operation stopped. Y1 relay / Stage 1 failed. (Pilot relay contacts did not close
or
the relay coil did not energize; no input back to IFC chip). Critical Alert.
Cleared after reset and Y1 input sensed.
Y2 relay / Stage 2 failed. (Pilot relay contacts did not close or the relay coil did
not energize; no input back to IFC chip). Critical Alert. Cleared after reset and
Y1 input sensed.
Interlock relay is energized, but input is not sensed after 3 seconds. There will
be no heating or cooling due to this error. De­energize interlock relay and ener­
gize after 5 minutes if demand is still present.
Interlock relay continuously sensed (with relay off). No heating and cooling
operations. Alarm clears 30 seconds after fault clears.
W1 relay energized, but input is not sensed after three seconds.
Defrost cycle lasts longer than 20 minutes. Check heat pump operation.
Cleared
when W1 signal is removed. Applicable only in communicating mode with
non­communicating heat pump.
Interlock relay energized, but input not sensed after 3 seconds. No heating and
cooling operations. De­energize interlock relay and re­energized 5 minutes
later if demand is still present. Alarm clears 5 minutes after fault clears.
33
7-Day Programmable iComfort Wi‐Fi
®
Flex Thermostat