Hunter 42122 Owner's Manual page 14

Features
Alerts
3. Auxiliary Heat: On multi-stage heat pumps this alert indicates
your second stage heat is running.
4. Check System: Some heat pump systems are equipped with the
ability to check system performance, indicated by the presence of
an "L" wire attached to the backplate. This icon will flash on screen
to alert the user that the heat pump is reporting a problem with
the system. It may be necessary to have the heat pump checked or
serviced by an HVAC technician.
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44047-01 • 04/13/2010