Lennox iComfort S30 Installation And Setup Manual page 59

Table 1 Alert Codes and Troubleshooting
Applicable
Alert Priority
System
Code Condition
Component(s)
403 Moderate Outdoor unit
404 Critical Outdoor unit
405 Critical Outdoor Unit
406 Critical Outdoor unit
407 Critical Outdoor unit
408 Critical Outdoor unit
Furnace, air
409 Moderate handler or outdoor
unit
410 Moderate Outdoor unit
411 Critical Outdoor unit
412 Moderate 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
Compressor The compressor ran for less than three minutes to satisfy a thermostat de­
Short-Cycling mand.
The compressor rotor is locked up.
√ Compressor rotor locked up due to run capacitor short.
Compressor Rotor
Locked
√ Bearings are seized.
√ Excessive liquid refrigerant, etc. (NOTE: May need to install hard start kit).
The compressor circuit is open.
Compressor Open Circuit
√ Compressor circuit open (due to power disconnection - open fuse, etc.)
Compressor Open Start The required amount of current is not passing through the START current
Circuit transformer.
Compressor Open Run The required amount of current is not passing through RUN current trans­
Circuit former.
Compressor Contactor
The compressor is running continuously.
Welded
The secondary voltage for the applicable system component has fallen be­
low 18VAC.
√ Secondary voltage is below 18VAC.
Compressor Voltage Low
√ If this continues for 10 minutes, the thermostat will turn off the applicable
system component.
Unit low pressure is below the required limit.
√ Check operating pressures.
Open Low Pressure
Switch
√ Low pressure switch opens at at a specific pressure (system shuts down)
and closes at a specific pressure (system restarts).
The low pressure switch has opened five times during one cooling or heat­
ing demand.
√ Thermostat will shut down the outdoor unit.
Low Pressure Switch
√ Open low pressure switch error count reached five strikes.
Strikes Lockout
√ Check system charge using both approach and sub-cooling methods.
√ Reset by putting outdoor unit control in test mode or resetting low voltage
power.
The unit high pressure is above the upper limit.
√ System will shut down.
Open High Pressure √ Confirm that the system is properly charged with refrigerant.
Switch
√ Check condenser fan motor, expansion valve (if installed), indoor unit blow­
er motor, stuck reversing valve or clogged refrigerant filter.
√ Confirm that the outdoor unit is clean.
59
How to clear alert code
Automatically clears after four
consecutive normal compressor
run cycles.
Automatically clears after four
consecutive normal run cycles or
after power reset.
Automatically clears after one nor­
mal compressor run cycle.
Automatically clears after current
is sensed in START sensor, or af­
ter power reset.
Automatically clears after current
is sensed in RUN sensor, one nor­
mal compressor run cycle, or after
power reset
Automatically clears one normal
compressor run cycle or after
power reset.
Automatically clears after voltage
is detected as higher than 20VAC
for two seconds or after power re­
set.
Automatically clears when the
system detects that the issue no
longer exists.
Automatically clears when the
system detects that the issue no
longer exists.
Automatically clears after the high
pressure switch closes or a power
reset