Lennox iComfort S30 Installation And Setup Manual page 62

Initial notification of critical alerts will pop up on the home screen and will be listed under notification menu. Minor and moderate alerts are found only under the notification menu.
* Current Lennox modulating outdoor units are XC20, XP20, XC25 and XP25.
Applicable
Alert Priority
System
Code Condition
Component(s)
355 Critical Air handler
370 Critical Furnace
Equipment
Moderate /
380 interface
Critical
module
Equipment
Moderate /
381 interface
Critical
module
Equipment
382 Moderate interface
module
400 Critical Outdoor unit
401 Moderate Outdoor unit
402 Critical Outdoor unit
Table 18. Alert Codes and Troubleshooting
Actual
Displayed Alert Component or System Operational State and Troubleshooting Tip
Text
There is an issue with the air handler's fifth stage electric heat.
Electric Heat
• Either the pilot relay contacts did not close or the relay coil in the electric heat section did not
Stage 5
energize.
Problem
• The air-handler will operate on first stage electric heat until the issue is resolved.
The furnace control has not received 24VAC power for two minutes or more on the DS terminal
• The system will not operate.
Interlock Switch
• Dealer has cut the W914 jumper (Dehum, Harmony III) on the Lennox Furnace Control.
Open
• The thermostat monitors the DS terminal in the furnace for power and if the link has been cut
then power will be lost to DS.
Interlock relay failure (furnace or air handler modes only).
• Interlock relay is energized, but input is not sensed after three seconds.
Interlock Relay
• There will be no heating or cooling due to this alert code – moderate condition.
Failure
• De-energize interlock relay and energize after five minutes if demand is still present – critical
condition.
Interlock relay stuck (furnace or air handler modes only).
• Interlock relay continuously sensed (with relay off).
Interlock Relay
Stuck
• There is no heating and cooling operation – moderation condition.
• After 10 minutes if event still exist it will be escalated – critical condition.
Relay W1 Relay W1 failure (furnace or air handler modes only). W1 relay is energized but input is not
Failure sensed after three seconds.
The compressor internal overload has tripped.
Compressor
• Thermostat demand Y1 is present; however compressor is not running.
Internal
• Check power to unit.
Overload
• This alert code is automatically cleared after current is sensed in both RUN and START sensors
Tripped
for at least two seconds or after service is removed, or after power reset.
Either the compressor ran for more than 18 hours continuously while attempting to cool the home
during a single demand or the system refrigerant pressure is low.
• Alert code will not lockout system.
• If the two-stage outdoor unit has:
Compressor • An outdoor control with blinking LED lights then the unit will run in low speed;
Long Run Cycle
• An outdoor control with a 7-segment display, the outdoor control will display alert code 401, but
continue to run in high speed.
• If the outdoor unit is a heat pump, and the outdoor temperature is less than 65°F, alert code
401 is ignored.
• Also monitors low pressure switch trips.
Outdoor
• Either the discharge or suction pressure level is out-of-limits, or the compressor has overloaded.
Unit System
• Check discharge or suction pressure.
Pressure Trip
62
How to clear alert code
Automatically clears after fault
recovered.
This alert code will clear when
24VAC is continuously sensed
on DS terminal for a minimum
of 10 seconds or on a power
reset.
Automatically clears after fault
recovered.
Automatically clears 30 seconds
after fault clears.
Automatically clears when W1
relay input is sensed.
Automatically clears when the
system detects that the issue no
longer exists.
Automatically clears after 30
consecutive normal run cycles or
power reset.
Automatically clears after four
consecutive normal compressor
run cycles.