Lennox iComfort S30 Installation And Setup Manual page 58

Table 1 Alert Codes and Troubleshooting
Applicable
Alert Priority
System
Code Condition
Component(s)
355 Critical Air handler
370 Critical Furnace
Moderate / Equipment
380
Critical interface module
Moderate / Equipment
381
Critical interface module
Equipment
382 Moderate
interface module
400 Critical Outdoor unit
401 Moderate Outdoor unit
402 Critical Outdoor unit
Critical alerts are displayed on the Home screen, in the Homeowner alert button, and in the Installer alert button.
Minor and moderate alerts are found only in the Installer alert button.
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.
√ Either the pilot relay contacts did not close or the relay coil in the electric
Electric Heat Stage 5
heat section did not energize.
Problem
√ The air-handler will operate on first stage electric heat until the issue is re­
solved.
The furnace control has not received 24VAC power for two minutes or more
on the DS terminal
√ The system will not operate.
Interlock Switch Open
√ Dealer has cut the W914 jumper (Dehum, Harmony III)
√ 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.
√ There will be no heating or cooling due to this alert code – moderate condi­
Interlock Relay Failure
tion.
√ 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 failure (furnace or air handler modes only).
Relay W1 Failure
√ W1 relay is energized but input is not sensed after three seconds.
The compressor internal overload has tripped.
√ Thermostat demand Y1 is present; however compressor is not running.
LSOM Comp. Internal
√ Check power to unit.
Overload Tripped
√ This alert code is automatically cleared after current is sensed in both RUN
and START sensors 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 at­
tempting 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:
√ An outdoor control with blinking LED lights then the unit will run in low
Compressor Long Run
Cycle speed;
√ 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.
Either the discharge or suction pressure level is out-of-limits, or the com­
Outdoor Unit System
pressor has overloaded.
Pressure Trip
√ Check discharge or suction pressure.
58
How to clear alert code
Automatically clears after fault re­
covered.
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 re­
covered.
Automatically clears 30 seconds
after fault clears.
Automatically clears when W1 re­
lay input is sensed.
Automatically clears when the
system detects that the issue no
longer exists.
Automatically clears after 30 con­
secutive normal run cycles or
power reset.
Automatically clears after four
consecutive normal compressor
run cycles.