Honeywell SUITEPRO TB8575

Questions and Answers

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Patricia ParkerAug 20, 2025
What to do if heating or cooling does not come on with Honeywell SUITEPRO TB8575?
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  sheila61Aug 20, 2025
  If your Honeywell Thermostat is calling for heat or cool, but nothing is happening, the heating or cooling equipment might not be working. Check the wiring and make sure the System Type setting matches your equipment using Installer Setup code #2. You can also test the equipment in Installer Test mode.
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Adam CharlesAug 22, 2025
Why Honeywell SUITEPRO TB8575 display does not come on?
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  Amanda SimpsonAug 22, 2025
  If your Honeywell Thermostat display does not come on, the thermostat may not be getting power. For TB6575A/B/C models, check for 120/240/277 Vac between L and N. For TB8575A models, check for 24 Vac between R and C.
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Yolanda JonesAug 25, 2025
What to do if heat does not turn on with Honeywell SUITEPRO TB8575 Thermostat?
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  Sophia PierceAug 25, 2025
  If the heat does not turn on, but “Heat On” is solid on your Honeywell Thermostat display, it could be due to heating equipment failure or a loose/broken wire. * For TB6575A/B/C: Check for 120/240/277 Vac at the equipment between power and common (L and N terminals), and between the heat (W) and common (N) terminals. If voltage is present, the thermostat is functional. * For TB8575A: Check for 24 Vac at the equipment on the secondary side of the transformer between power and common (R and C terminals), and between the heat terminal (W) and transformer common. If voltage is present, the thermostat is functional. If voltage is not present, check the wire connection between the thermostat and the heating equipment.
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Mike BeckAug 26, 2025
What to do if cooling does not turn on with Honeywell SUITEPRO TB8575?
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  Andrew BakerAug 26, 2025
  If the cool does not turn on, but “Cool On” is solid on your Honeywell Thermostat display, it could be due to cooling equipment failure or a loose/broken wire. * For TB6575A/B/C: Check for 120/240/277 Vac at the equipment between power and common (L and N terminals), and between the cool (Y) and common (N) terminals. If voltage is present, the thermostat is functional. * For TB8575A: Check for 24 Vac at the equipment on the secondary side of the transformer between power and common (R and C terminals), and between the cool terminal (Y) and transformer common. If voltage is present, the thermostat is functional. If voltage is not present, check the wire connection between the thermostat and the cooling equipment.
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Audrey SimsAug 27, 2025
Why are both heating and cooling running on Honeywell SUITEPRO TB8575 Thermostat?
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  Brian ChavezAug 27, 2025
  If both the heating and cooling equipment are running at the same time with your Honeywell Thermostat, it could be due to an incorrect System Type selection or shorted wires. Check that the Installer Setup code #2 (System Type) value matches the installed heating and/or cooling equipment. Also, separate any shorted heating and cooling wires.
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Donna BrooksAug 29, 2025
Why is Honeywell Thermostat heating in cool mode?
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  Donald BoydAug 29, 2025
  If the heating equipment is running in the Cool mode with your Honeywell Thermostat, the System Type is likely configured incorrectly. Verify that the Installer Setup code #2 (System Type) value matches the installed heating and/or cooling equipment.
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Daniel MunozAug 31, 2025
Why Honeywell SUITEPRO TB8575 is not turning off?
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  Shelley Gillespie MDAug 31, 2025
  If the heating equipment does not turn off and the heat temperature setting is below room temperature (Heat On is not in the display) for your Honeywell Thermostat, the System Type might be configured incorrectly. Check that the Installer Setup code #2 (System Type) value matches the installed heating and/or cooling equipment.
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Kyle RodriguezSep 2, 2025
Why is remote sensor not displaying temperature on Honeywell SUITEPRO TB8575?
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  mhoffmanSep 2, 2025
  If the remote sensor on your Honeywell Thermostat is not displaying temperatures, it could be due to an incorrect IS code or an incompatible sensor. Set the Installer Setup code #4 to Remote (value = 1). Also, ensure that the remote sensor is a TR21 or a compatible 20K NTC.
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bensonjuliaSep 4, 2025
Why doesn't the fan turn on with heat on Honeywell Thermostat?
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  Raymond GarciaSep 4, 2025
  If the fan does not turn on when your Honeywell Thermostat is calling for heat, there may be a wiring or connection issue. Check the wiring and ensure the connection is correct.
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williamjensenSep 6, 2025
Why is 'Heat On' not showing on Honeywell SUITEPRO TB8575?
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  Eric BensonSep 6, 2025
  If “Heat On” is not displayed on your Honeywell Thermostat, the System Type setting may not be set to Heat, or the temperature setting is not set above the room temperature. Set the Installer Setup code #2 to Heat and ensure the temperature setting is above the current room temperature.