Honeywell TB6575 Manual De Usuario

62-0278—07

18

Both the heating and 

cooling equipment are 

running at the same 

time. 

Incorrect System Type 

selected.

Check that the Installer Setup code #2 (System Type) value 

matches the installed heating and/or cooling equipment. 

Heating and cooling wires 

are shorted together. 

Separate the shorted heating and cooling wires.

Cooling does not turn 

on (Cool On is solid in 

the display). 

Cooling equipment failure.  For TB6575A/B/C:

1. Check for 120/240/277 Vac at the equipment between power 

and common, (terminals L and N).

2. Check for 120/240/277 Vac between the cool (Y) and com-

mon (N) terminals. If 120/240/277 Vac is present, the ther-

mostat is functional.

For TB8575A:

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 trans-

former common. If 24 Vac is present, the thermostat is func-

tional. 

If voltage is present, check the cooling equipment to find the cause 

of the problem.

Loose connection or 

broken wire between 

thermostat and cooling 

equipment. 

For TB6575A/B/C:

Check for 120/240/277 Vac between the cool (Y) and common 

(N) terminals. 

For TB8575A:

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. 

Fan does not turn on 

in a call for Heat. 

Wiring or connection 

failure

Check wiring and make sure the connection is correct.

Cannot select fan 

speed.

Fan Control Type 

selection is incorrect.

Check that the Installer Setup code #9 (Fan Control) value is set to 

zero (0). 

Heating equipment is 

running in the Cool 

mode. 

Incorrect System Type 

configured.

Check that the Installer Setup code #2 (System Type) value 

matches the installed heating and/or cooling equipment. 

Heating equipment 

does not turn off and 

heat temperature 

setting is set below 

room temperature 

(Heat On is not in the 

display). 

Incorrect System Type 

configured.

Check that the Installer Setup code #2 (System Type) value 

matches the installed heating and/or cooling equipment. 

Cannot set the system 

setting to Heat. 

System Type (Installer 

Setup code #2) is set to 

Cool Only (value = 1). 

Set the Installer Setup code #2 value to match the installed heating 

and/or cooling equipment. 

Cannot set the system 

setting to Cool. 

System Type (Installer 

Setup code #2) is set to 

Heat Only (value = 0).

Set the Installer Setup code #2 value to match the installed heating 

and/or cooling equipment. 

Heat On is not in the 

display. 

System Type setting is not 

set to Heat and/or the 

temperature setting is not 

set above the room 

temperature. 

Set the Installer Setup code #2 to Heat and set the temperature 

setting above the room temperature. 

Cool On is not in the 

display. 

System Type setting is not 

set to Cool and/or the 

temperature setting is not 

set below the room 

temperature. 

Set the Installer Setup code #2 to Cool and set the temperature 

setting below the room temperature. 

Remote sensor does 

not display 

temperatures

Incorrect IS code.

Set the Installer Setup code #4 to Remote (value = 1).

Sensor is not compatible. The remote sensor must be TR21 or compatible 20K NTC.