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Table 19. Alert Codes and Troubleshooting
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. Moderate alerts
are not e-mailed to Homeowners. Dealers will get an email and code can be seen on thermostat under the installer notification section.
NOTE:
Anytime the word
DEVICE
or
DEVICE2
is used in this table, it will be replaced on all alert code notification screens with the actual offending device name, for example, thermostat, heat
pump, etc.).
Alert
Code
Inverter
Flash
Code
Priority
Condition
Applicable
Component
Actual Displayed
Alert Text
Component or System Operational State and Troubleshooting Tip
290
Critical
Furnace
Ignition Circuit
Problem
There is a problem with the furnace ignition circuit. The system will go into Watchguard mode.
• Measure resistance of hot surface igniter.
•
Replace the hot surface igniter; it is not within specifications.
•
Measure voltage to igniter.
Automatically clears on successful ignition
291
Critical
Furnace
Heat Airflow
Restricted Below
Min
The heating airflow is below the minimum required level. The system will go into Watchguard mode.
•
Check for dirty air filter(s) and other air flow restrictions.
• Check blower performance.
Automatically clears when a heat call ends successfully.
292
Critical
Furnace or
zoning dampers
(if applicable)
Indoor Blower
Motor Start
Problem
The indoor unit blower motor will not start. The system will go into Watchguard mode.
• Indoor blower motor unable to start.
• This could be due to seized bearing, stuck wheel, and obstructions.
• Replace motor, motor module or wheel if assembly does not operate or meet performance standards.
Automatically clears after the indoor blower motor starts successfully.
294
Critical
Furnace
Inducer Motor
Overcurrent
There is over current in the furnace inducer motor. The system will go into Watchguard mode.
• Check combustion blower bearings, wiring and amps.
• Replace furnace inducer motor if it does not operate or does not meet performance standards.
NOTE:
Refer to Service and Application Note
H-17-02
“All Communicating Variable Speed Motors”.
Automatically clears after inducer motor current is sensed to be in-range after the ignition following either Watchguard mode or
unit reset.
310
Moderate
Indoor unit
or iHarmony
control module
Discharge Air
Temp Sensor
Problem
There is a discharge air temperature sensor issue.
• Compare discharge temperature sensor (DATS) resistance to temperature / resistance charts in system component
installation instruction.
• Replace discharge air sensor if necessary.
NOTE:
Confirm there is no short or open circuits in the Lennox communicating thermostat connections to any of the other
components in the communication system.
NOTE:
Issues with a discharge air temperature sensor (DATS) connected to a iHarmony control module or equipment interface
model will not generate an alert code.
Automatically clears 30 seconds after condition is detected as recovered or after system restart.
