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Symptom
Activity Sensing does
not exit when button
pressed
Freeze Protection
does not activate
Auto Fan Reset does
not activate
Table 8. Troubleshooting. (Continued)
Possible Cause
All buttons are locked.
System Type is set to
Cool.
System mode is not Off.
Incorrect ISU code.
Calling for Heat/Cool
setpoint couldn't be
satisfied.
TB6575/TB8575 DIGITAL FAN COIL THERMOSTATS
Make sure keypad lockout is disabled. Set ISU code #18, value =
0.
Freeze protection is not activated when system type is Cool (ISU
code #2; value = 1). Change System Type.
Set the System mode button to Off.
Set the Installer Setup code #24 to Enabled (value = 1 or 2).
Only after the setpoint is satisfied, will the auto fan reset timer
activate.
19
Action
62-0311—05
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