Lennox iComfort S30 Installation And Setup Manual page 56

Table 1 Alert Codes and Troubleshooting
Applicable
Alert Priority
System
Code Condition
Component(s)
295 Minor Furnace
Furnace, air
handler, equipment
310 Moderate
interface module or
iHarmony
311 Minor Furnace
Furnace or air
312 Minor
handler
Furnace, air
handler and
313 Minor
outdoor unit
344 Critical Furnace
Air handler,
equipment
345 Critical
interface module or
heat pump
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
The indoor blower motor is overheating. Indoor blower motor over tempera­
ture (motor tripped on internal protector).
Indoor Blower Over
√ Check motor bearings and amps.
Temperature
√ Replace indoor blower motor if necessary.
√ Check for high duct static.
There is a discharge air temperature sensor issue.
√ Compare discharge temperature sensor resistance to temperature / resis­
tance charts in system component installation instruction.
Discharge Air Temp
√ Replace discharge air sensor if necessary.
Sensor Problem
√ Damper control module will operate in non-zone mode (all dampers open).
NOTE: Confirm there is no short or open circuits in the iComfort thermostat
connections to any of the other components in the communication system.
The heat firing rate has been reduced to match available airflow (cutback
mode). This is a warning only alert code.
√ Furnace blower in cutback mode due to restricted airflow.
Heat Rate Reduced to
√ Reduce firing rate every 60 seconds to match available CFM.
Match Airflow
√ Check air filter and duct system.
√ To clear, replace air filter if needed or repair or add additional ducting.
√ Two-stage controls will reduce firing rate to first stage.
The indoor blower cannot provide the requested CFM due to high static
pressure. This is a warning only alert code.
√ Possible restricted airflow - Indoor blower is running at a reduced CFM
(Cutback Mode).
Reduced/Airflow-Indoor
√ The variable speed motor has pre-set speed and torque limiters to protect
Blower Cutback
the motor from damage caused by operating outside of design parameters
(0 to 0.8" e.g. total external static pressure).
√ Check air filter and duct system.
√ To clear, replace air filter if needed or repair or add additional ducting.
The indoor and outdoor unit capacities do not match. This is a warning only
alert code.
Indoor/Outdoor Unit
√ Check for proper system component configuring in installation instructions.
Capacity Mismatch
√ The system will operate, but might not meet efficiency and capacity param­
eters.
Link Relay Problem. Relay Y1 Failure
√ Possible Y1 relay failure.
Relay Y1 Stuck
√ All system operations will stop.
The O relay on the system component has failed. Either the pilot relay con­
tacts did not close or the relay coil did not energize.
√ Possible O relay / stage 1 failure.
√ Pilot relay contacts did not close or the relay coil did not energize.
Relay O Failure
√ Replace system component (device) control.
√ If error is applicable to the XC/XP 25, the outdoor control will need to be re­
placed.
56
How to clear alert code
Automatically clears after blower
demand is satisfied.
Automatically clears 30 seconds
after condition is detected as re­
covered or after system restart.
Automatically clears when a heat­
ing call finishes successfully.
Automatically clears after the cur­
rent service demand is satisfied.
Automatically clears after commis­
sioning is complete.
Automatically clears 300 seconds
after Y1 input sensed OFF.
Automatically clears after the fault
recovered following reset.