Lennox iComfort G71MPP-03 Setup Manual page 29

Table 10. Alert Codes and Troubleshooting
Alert
Priority Alert Text
Code
344 Critical (Furnace) Relay Y1 Failure
(Air Handler / Equipiment Interface Module)
The "O" relay on the air-handler has failed.
345 Critical
Either the pilot relay contacts did not close or
the relay coil did not energize.
(Air Handler) The heat pump jumper was not
346 Critical
removed on the air-handler control board.
(Furnace / Air Handler / Equipiment Interface
Module) The "Y1" relay on the (furnace or
347 Critical air-handler) has failed. Either the pilot relay
contacts did not close or the relay coil did not
energize.
(Furnace / Air Handler) The "Y2" relay on the
(furnace or air-handler) has failed. Either the
348 Critical
pilot relay contacts did not close or the relay
coil did not energize.
(Furnace) The "O" to "R" jumper on the fur
349 Critical
nace needs to be restored.
(Air Handler) The air-handler's electric heat is
350 Critical
not configured.
(Air Handler) There is a problem with the air-
handler's 1st stage electric heat. Either the
351 Critical pilot relay contacts did not close, or the relay
coil in the electric heat section did not ener
gize.
(Air Handler) There is a problem with the air-
handler's 2nd stage electric heat. Either the
pilot relay contacts did not close, or the relay
352 Critical
coil in the electric heat section did not ener
gize. The air-handler will operate on 1st
stage electric heat until the issue is resolved.
(Air Handler) There is a problem with the air-
handler's 3rd stage electric heat. Either the
pilot relay contacts did not close, or the relay
coil in the electric heat section did not ener
353 Critical
gize. The air-handler will operate on 1st
stage electric heat until the issue is re
solved.`
(Air Handler) There is a problem with the air-
handler's 4th stage electric heat. Either the
pilot relay contacts did not close, or the relay
354 Critical
coil in the electric heat section did not ener
gize. The air-handler will operate on 1st
stage electric heat until the issue is resolved.
(Air Handler) There is a problem with the air-
handler's 5th stage electric heat. Either the
pilot relay contacts did not close, or the relay
355 Critical
coil in the electric heat section did not ener
gize. The air-handler will operate on 1st
stage electric heat until the issue is resolved.
(Furnace) The furnace control board has not
370 Critical received 24VAC power for 2 minutes or
more.
Moderate (Equipment Interface Module) Interlock relay
380
/ Critical failure (IFC or AHC mode only)
Moderate (Equipment Interface Module) Interlock relay
381
/ Critical stuck (IFC or AHC modes only)
(Equipment Interface Module) Relay W1 fail
382 Moderate
ure (IFC and AHC modes only)
(Outdoor Unit) The compressor internal over
400 Critical
load has tripped.
(Outdoor Unit) Either the compressor ran for
more than 18 hours continuously trying to
401 Moderate
cool the home or the refrigerant pressure in
the system is low.
(Outdoor Unit) Either the discharge or suction
pressure level is out-of-limits, or the is com
402 Critical
pressor overloaded.
(Outdoor Unit) The compressor ran for less
than 3 minutes to satisfy a thermostat de
403 Moderate
mand.
®
iComfort Wi-Fi
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
Y1 relay failed; operation stopped. Alarm clears 300 seconds after Y1 input sensed
OFF.
O relay / Stage 1 failed. Pilot relay contacts did not close or the relay coil did not energize.
Replace control. Cleared after the fault recovered following reset.
Configuration link(s) not removed on control. Cut O-R. Applicable with non communicating
outdoor unit with communicating indoor system.
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.
Configuration link R to O needs to be restored. Replace link or hard-wire. Applicable in non
communicating mode. Critical Alert.
Heat call with no configured or incorrectly configured electric heat. Check for proper configuring
under Configuring Electric Heat Stages in the air handler installation instructions. Cleared after
electrical heat detection is successful.
Heat section / Stage 1 failed. (Pilot relay contacts did not close, or the relay coil in the electric
heat section did not energize.) Air handler will operate on 1st stage for reminder of the heat call.
Will clear after fault recovered.
Heat section / Stage 2 failed (Same as Code 351).
Heat section / Stage 3 failed (Same as Code 351).
Heat section / Stage 4 failed (Same as Code 351).
Heat section / Stage 5 failed (Same as Code 351).
Control sees the loss of 24VAC for 2 minutes .Terminate all services and wait for
interlock switch to close. The alarm will clear when 24VAC is continuously sensed on DS ter
minal for a minimum of 10 seconds or on a power reset. If 2 stage with float switch, the IFC
control R-DS is open.
Interlock relay is energized, but input is not sensed after 3 seconds. There will be no heating or
cooling due to this error. De-energize interlock relay and energize 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.
Thermostat demand Y1 is present; but, compressor is not running. Check power to unit. Clears
the error after current is sensed in both RUN and START sensors for at least 2 seconds, or
after service is removed, or after power reset.
Compressor ran more than 18 hours to satisfy a single thermostat demand. Will not lockout
system. If 2 stage, units with blinking LED light controls, unit will run in low speed; units with
7-segment display will display code, but continue to run in high speed. If a Heat Pump, and if
outdoor temp is less than 65 degrees, code is ignored. Clears the error after 30 consecutive
normal run cycles or power reset. Also monitors low pressure switch trips.
Discharge or suction pressure out-of-limits, or compressor overloaded. Clears the error after 4
consecutive normal compressor run cycles.
Compressor runs less than 3 minutes to satisfy a thermostat demand. Clears the
error after 4 consecutive normal run cycles or power reset.
7-Day Programmable Communicating Thermostat
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