Lennox iComfort S30 Installation And Setup Manual page 67

Table 1 Alert Codes and Troubleshooting
Applicable
Alert Priority
System
Code Condition
Component(s)
443 Critical Outdoor unit
Moderate /
530 IHarmony
Critical
532 Moderate IHarmony
Moderate/
542 IHarmony
Critical
Moderate/
543 IHarmony
Critical
Moderate/
544 IHarmony
Critical
Moderate/
545 IHarmony
Critical
Moderate / Equipment
594
Critical interface module
600 Minor 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
Incorrect appliance unit size code selected.
√ Check for proper configuring under unit size code used for outdoor unit (see
unit configuration guide or in installation instructions).
MUC Unit Code to
Inverter Model Mismatch
√ If replacing inverter, verify inverter model matches unit size.
√ Remove the thermostat from the system while applying power and repro­
gramming.
Low Damper 24VAC Voltage
Low Damper 24VAC Volt­
√ Damper supply voltage is less than 18VAC.
age
√ Maintain non-zone mode for five minutes after alarm clears.
Zoning Pressure Switch Opened (high pressure)
√ Compressor pressure is above the specified limit.
Zoning Pressure Switch
Opened (High Pressure)
√ Compressor is turned off.
√ Zoning will be restored once the high pressure switch closes.
Zone 1 Temperature
√ Zone temperature sensor reading out of range.
Sensor Problem
√ Open or short zone temperature sensor detected for more than five sec­
Zone 2 Temperature
ond.
Sensor Problem
√ Damper control module will operate in non-zone mode (all dampers open)
Zone 3 Temperature
– moderate condition.
Sensor Problem
√ If after 10 minutes the condition does not change, the priority code is
Zone 4 Temperature
change to critical. System will continue to operate in non-zone mode.
Sensor Problem
Pre-coil discharge air temperature sensor problem (DFM mode only). Ad­
vances from moderate to critical after ten (10) minutes.
√ Interlock relay energized, but input not sensed after three seconds.
Pre-Coil Air temp Sensor
Problem
√ No heating and cooling operations.
√ De-energize interlock relay and re-energized five minutes later if demand
is still present.
Compressor has been cycled OFF on utility load shedding.
√ Load shedding function provides a method for a local utility company to limit
Load Shed Event the maximum power level usage of the outdoor unit.
√ The feature is activated by applying 24VAC power across the L and C ter­
minals on the outdoor control.
67
How to clear alert code
Automatically clears after the cor­
rect match is detected following a
power reset.
Automatically clears when the
condition no longer exists.
Automatically clears after com­
pressor pressure is within limits.
Automatically clears 30 seconds
after condition no longer exist.
Alarm clears five minutes after
fault clears.
Automatically clears when L termi­
nal is inactive.