System information

DCN: 141-01070-03 TR40 Thermostat Manual 9
o LED On, “Vent” displayed > fresh air venting is active
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 “Communications Failure” at the top center of the Main Thermostat Screen (where outside
temperature is normally displayed) . Momentary display of “Communications 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.