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There are three LED indicators located on the front of the thermostat. They are designed to inform you
about the following:
LED Color Function
AUX Green
• This turns on when the auxiliary (second stage) heating is in operation
• It turns on 1-6°F below first stage and is user adjustable (see
Configuration, Step 3, Page 19)
CHECK Red
• When this turns on, a malfunction has occurred somewhere in the heat
pump system
• Please contact a qualified service technician as soon as possible to check
your system
EMER Red
• This light turns on whenever the emergency heat is manually selected
(Mode switch is in the EMER position)
• While in the emergency Heat mode, the heat pump compressor is off, and
the emergency heat (same as the auxiliary heat) maintains the setpoint
temperature
Once the thermostat is installed, it should be thoroughly tested.
CAUTION!:
Do not energize the air conditioning system when the outdoor temperature is below 50
degrees. It can result in equipment damage or personal injury.
Testing the Thermostat
LED Indicators
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