To Next PageTo Next PageHow to fix a Honeywell Thermostat when the display does not come on?
If the Honeywell Thermostat display doesn't turn on, it might not be getting power. First, ensure that there is 24 Vac between C and Rc. Also, verify that the AAA batteries are correctly installed and in good condition.
Why won't my Honeywell VisionPRO TB8220 temperature settings change?
If you cannot change the temperature settings on your Honeywell Thermostat, it could be due to reaching the upper or lower temperature limits. Check the temperature setpoints and modify ISU 0600 and 0610 as needed. Alternatively, the keypad may be fully locked. Check ISU 0670 to change keypad locked options.
What to do if my Honeywell VisionPRO TB8220 heating or cooling does not come on?
If your Honeywell Thermostat isn't activating the heating or cooling, it could be due to a few reasons. The thermostat minimum off-time might be activated, so wait up to five minutes for the system to respond. Also, the system selection might not be set to Heat or Cool; ensure it's in the correct position. Finally, the system type selection could be incorrect; check ISU 0170 and choose the correct system type.
Why is my Honeywell Thermostat calling for heat or cool but nothing is running?
If your Honeywell Thermostat indicates it's calling for heat or cool, but nothing is happening, the heating or cooling equipment might not be operating. Check the wiring and ensure it's correct. Verify that ISU 0170 is set with the correct system type. You can also verify the equipment operation in System Test mode.
Why won't the heat turn on my Honeywell VisionPRO TB8220?
If the heat isn't turning on, and 'Heat On' is solid on the Honeywell Thermostat display, it could be due to heating equipment failure. Check for 24 Vac at the equipment on the secondary side of the transformer between power and common. If voltage isn't present, inspect the heating equipment to find the cause. Also, check for 24 Vac between the heat terminal (W) and transformer common. If 24 Vac is present, the thermostat is likely functional, so check the heating equipment. Another possibility is a loose or broken wire connection between the thermostat and heating equipment. Check for 24 Vac between the heat terminal (W) and transformer common. If voltage isn't present, check the wire connection between the thermostat and heating equipment.
What causes cooling not to turn on with a Honeywell Thermostat?
If the cooling does not turn on and 'Cool On' is solid on the Honeywell Thermostat display, it could indicate a cooling equipment failure. Check for 24 Vac at the equipment on the secondary side of the transformer between power and common. If voltage is absent, check the cooling equipment. Also, check for 24 Vac between the cool terminal (Y) and transformer common. If 24 Vac is present, the thermostat is working, so check the cooling equipment. Another cause might be a loose or broken wire connection between the thermostat and cooling equipment. Check for 24 Vac between the cool terminal (Y) and transformer common. If voltage is not present, check the wire connection.
What does 'Wait' mean on my Honeywell VisionPRO TB8220 display?
If 'Wait' is displayed on your Honeywell Thermostat, the compressor minimum off timer is likely active. Wait up to five minutes for the cooling or heating (heat pump) equipment to turn on.
What to do if my Honeywell VisionPRO TB8220 heating equipment does not turn off?
If the heating equipment doesn't turn off, even with the heat temperature set below room temperature (and 'Heat On' isn't displayed on your Honeywell Thermostat), it might be because the System Type (ISU 0170) is incorrectly set to Heat Pump. Set System Type (ISU 0170) to match the actual heating and/or cooling equipment installed.
How to unlock a Honeywell VisionPRO TB8220 screen?
If 'Screen Locked' appears on the screen and some keys don't respond on your Honeywell Thermostat, the keypad is likely locked. Check ISU 0670 to change the keypad locked options.
Why are both heating and cooling running at the same time on my Honeywell VisionPRO TB8220 Thermostat?
If both heating and cooling equipment run simultaneously with your Honeywell Thermostat, it could be because the system type is incorrectly set to Heat Pump in ISU 0170, even though the heating equipment is not a heat pump. Set System Type (ISU 0170) to match the installed equipment. Another possible cause is shorted heating and cooling wires. Separate the shorted wires to resolve this.
General| Brand | Honeywell |
|---|---|
| Model | VisionPRO TB8220 |
| Category | Thermostat |
| Language | English |
Specifies operating and shipping temperature ranges and humidity tolerance for the thermostat and sensors.
Describes how to mount the thermostat/sensors and use of cover plates.
Provides physical dimensions for the thermostat and various sensors.
Guides on choosing an optimal location for thermostat installation.
Steps for separating the wallplate and mounting it securely to the wall.
Explains terminal functions and references figures for system wiring configurations.
Detailed explanations for each terminal designation on the thermostat.
Specific wiring for economizers, TOD, and conventional systems.
Wiring diagrams for various heat pump system types, with/without auxiliary heat.
Outlines the methods for powering the thermostat: batteries or 24 Vac.
Guidance on locating, mounting, and wiring the outdoor temperature sensor.
Details on wiring the C7089U outdoor sensor to the thermostat.
Instructions for wiring indoor sensors like T7770A or C7189U for averaging.
Process for setting the thermostat's calendar and current time.
How to access and navigate the full installer setup menu for advanced configurations.
How to access and navigate the simplified user settings menu for typical users.
Settings related to date configuration and schedule options.
Configuring the thermostat for specific heating and cooling system types.
Performing tests on cooling, heating, and fan systems via installer menu.
Explanation of the thermostat's main screen elements and indicators.
Understanding system settings and setting up heating/cooling schedules.
Procedures for modifying or cancelling specific schedule periods.
How to adjust the current time displayed on the thermostat.
Managing temporary temperature adjustments for different scenarios.
Configuring fan operation mode and understanding its status display.
Instructions for replacing batteries and recognizing low battery indicators.
Proper methods for cleaning the thermostat's touch screen interface.
How the thermostat displays temperatures from indoor and outdoor sensors.
Explains fully and partially locked screen modes for user interface control.
Features for automatic temperature management and compressor safety.
Setup for heat pumps with auxiliary heat and outdoor sensor integration.
Describes heat mode operation based on outdoor temperature and lockouts.
Procedures for operating and checking the C7089U outdoor sensor.
Operation and checkout for the C7189U indoor remote sensor.
Operation and checkout for the T7770A remote temperature sensor.
Troubleshooting steps for display issues and temperature setting problems.
Diagnosing and resolving problems when heating or cooling equipment is not operating correctly.
Troubleshooting for equipment running in wrong modes or wiring short circuits.
Information regarding the perchlorate material in the thermostat's lithium battery.
