Lennox iComfort S30 Installation And Setup Manual page 60

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)
Furnace and
310 Moderate
air handler only
311 Minor Furnace
Furnace or air
312 Minor
handler
Furnace, air
313 Minor handler and
outdoor unit
344 Critical Furnace
Air handler,
equipment
345 Critical interface
module or heat
pump
346 Critical Air handler
Table 18. Alert Codes and Troubleshooting
Actual
Displayed Alert Component or System Operational State and Troubleshooting Tip
Text
There is a discharge air temperature sensor issue.
• Compare discharge temperature sensor (DATS) resistance to temperature / resistance charts
in system component installation instruction.
Discharge Air
• Replace discharge air sensor if necessary.
Temp Sensor
NOTE: Confirm there is no short or open circuits in the iComfort thermostat connections to any
Problem
of the other components in the communication system.
NOTE:
Issues with a DATS connected to a damper control module or equipment interface model
will not generate an alert code.
The heat firing rate has been reduced to match available airflow (cutback mode). This is a warn-
ing only alert code.
• Furnace blower in cutback mode due to restricted airflow.
Heat Rate
• Reduce firing rate every 60 seconds to match available CFM.
Reduced to
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 warn-
ing only alert code.
• Possible restricted airflow - Indoor blower is running at a reduced CFM (Cutback Mode).
Reduced/
• The variable speed motor has pre-set speed and torque limiters to protect the motor from
Airflow-Indoor
damage caused by operating outside of design parameters (0 to 0.8" e.g. total external static
Blower Cutback
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 Capacity • Check for proper system component configuring in installation instructions.
Mismatch
• The system will operate, but might not meet efficiency and capacity parameters.
Link Relay Problem. Relay Y1 Failure
Relay Y1 Stuck • Possible Y1 relay failure.
• All system operations will stop.
The O relay on the system component has failed. Either the pilot relay contacts did not close or
the relay coil did not energize.
• Possible O relay / stage 1 failure.
Relay O Failure
• Pilot relay contacts did not close or the relay coil did not energize.
• Replace system component (device) control.
• If error is applicable to the XC25 or XP25, the outdoor control will need to be replaced.
The heat pump configuration link is not cut on the air handler control.
• Configuration link not cut on air handler control.
HP Jumper Not
Removed
• Cut O to R.
• This is only applicable with non-communicating heat pump with communicating indoor unit.
60
How to clear alert code
Automatically clears 30 seconds
after condition is detected
as recovered or after system
restart.
Automatically clears when a
heating call finishes success-
fully.
Automatically clears after the
current service demand is
satisfied.
Automatically clears after com-
missioning is complete.
Automatically clears five minutes
after Y1 input sensed OFF.
Automatically clears after the
fault recovered following reset.
Automatically clears when the
system detects that the issue no
longer exists.