DCN: 141-01060-13 1/05 TS40 Manual
7
Main Thermostat Screen LED Displays
The Main Thermostat screen has the following LEDs, numbered from top to bottom, 1-4.
o LED 1 Green: System Operation display.
o LED Off, “SYS OFF” displayed > HVAC system is OFF
o LED Off, “SYS MOT” displayed > HVAC is Off and Minimum Off Time (MOT) delay on is
active
o LED On, “SYS ON” displayed > HVAC System is ON
o LED On, “SYS MRT” displayed > HVAC System is ON and the Minimum Run Time
(MRT) delay off is active
o LED 2 Green: System Economy Mode display
o LED OFF or On, “Econ” displayed > Economy or 1
st
stage heating or cooling ON
o LED On, “2
nd
Stg” displayed > Stage 2 heating or cooling is ON
o LED On, “3
rd
Stg” displayed > Stage 3 heating is ON
o LED On, “Vent” displayed > fresh air venting is ON
o LED 3 Green: Run/Hold display. Shows state of Schedule Run/Hold Mode.
o LED Off, “Run” displayed > Schedule is running
o LED On, “Hold” displayed > Schedule is off, temperature setpoint hold in effect.
o LED 4 RED: Alert LED. Used for Messaging and other system alerts
o LED Off, “No Msg” displayed > No text messages or Alerts present
o LED On, Mail icon or Alert Text displayed > Message waiting or specific alert text
“Communications Error” Display
If the WDU is not properly wired or if communications to the Control Unit is interrupted, the LCD display
will display “Comm Failure” at the top center of the Main Thermostat Screen (where outside temperature is
normally displayed).
Momentary display of “Comm Failure” caused by loss of data, will clear automatically when data
communication is restored. If the “Communications Failure” display stays on, check wiring or control unit
for problems.
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General