Honeywell TB6575 SuitePRO Installation Instructions Manual page 15

TROUBLESHOOTING
Symptom
Cooling does not turn on
(Cool On is solid in the
display).
Fan does not turn on in a
call for Heat.
Cannot select fan speed. Fan Control Type selection is
Heating equipment is
running in the Cool
mode.
Heating equipment does
not turn off and heat
temperature setting is
set below room
temperature (Heat On is
not in the display).
Cannot set the system
setting to Heat.
Cannot set the system
setting to Cool.
Heat On is not in the
display.
Cool On is not in the
display.
Remote sensor does not
display temperatures
Remote Setback does
not activate
Activity Sensing does not
exit when button pressed
Freeze Protection does
not activate
Auto Fan Reset does not
activate
Table 6. Troubleshooting. (Continued)
Possible Cause
Cooling equipment failure.
Loose connection or broken
wire between thermostat and
cooling equipment.
Wiring or connection failure
incorrect.
Incorrect System Type
configured.
Incorrect System Type
configured.
System Type (Installer Setup
code #2) is set to Cool Only
(value = 1).
System Type (Installer Setup
code #2) is set to Heat Only
(value = 0).
System Type setting is not
set to Heat and/or the
temperature setting is not set
above the room temperature.
System Type setting is not
set to Cool and/or the
temperature setting is not set
below the room temperature.
Incorrect IS code.
Sensor is not compatible.
Incorrect IS code.
Remote setpoint error.
All buttons are locked.
System Type is set to Cool.
System mode is not Off.
Incorrect IS code.
Calling for Heat/Cool setpoint
couldn't be satisfied.
TB6575/TB8575 SUITEPRO™ DIGITAL FAN COIL THERMOSTATS
For TB6575A/B:
1. Check for 120/240 Vac at the equipment between power and
common, (terminals L and N).
2. Check for 120/240 Vac between the cool (Y) and common (N)
terminals. If 120/240 Vac is present, the thermostat is functional.
For TB875A:
1. Check for 24 Vac at the equipment on the secondary side of the
transformer between power and common (terminals R and C).
2. Check for 24 Vac between the cool terminal (Y) and transformer
common. If 24 Vac is present, the thermostat is functional.
If voltage is present, check the cooling equipment to find the cause of the
problem.
For TB6575A/B:
Check for 120/240 Vac between the cool (Y) and common (N)
terminals.
For TB875A:
Check for 24 Vac between the cool terminal (Y) and transformer
common.
If voltage is not present, check the wire connection (loose or broken)
between the thermostat and the cooling equipment.
Check wiring and make sure the connection is correct.
Check that the Installer Setup code #9 (Fan Control) value is set to zero
(0).
Check that the Installer Setup code #2 (System Type) value matches the
installed heating and/or cooling equipment.
Check that the Installer Setup code #2 (System Type) value matches the
installed heating and/or cooling equipment.
Set the Installer Setup code #2 value to match the installed heating and/or
cooling equipment.
Set the Installer Setup code #2 value to match the installed heating and/or
cooling equipment.
Set the Installer Setup code #2 to Heat and set the temperature setting
above the room temperature.
Set the Installer Setup code #2 to Cool and set the temperature setting
below the room temperature.
Set the Installer Setup code #4 to Remote (value = 1).
The remote sensor must be TR21 or compatible 20K NTC.
Make sure the NO/NC and timer selection is correct. Check the value
selected for IS code #19.
Make sure the remote setback setpoint is correct for energy saving usage.
Make sure keypad lockout is disabled. Set IS code #18, value = 0.
Freeze protection is not activated when system type is Cool (IS 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.
15
Action
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