Honeywell TB6575B1000/U Installation Instructions - Page 19

Tb6575/tb8575 Digital Fan Coil Thermostats

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TB6575/TB8575 DIGITAL FAN COIL THERMOSTATS Table 8. Troubleshooting. (Continued) Symptom Possible Cause Action Activity Sensing does All buttons are locked. not exit when button pressed Make sure keypad lockout is disabled. Set ISU code #18, value = 0. Freeze Protection does not activate System Type is set to Cool. System mode is not Off. Auto Fan Reset does not activate Incorrect ISU code. Calling for Heat/Cool setpoint couldn't be satisfied. 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 62-0311-05

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