Name: Honeywell Th8320U1008 Thermostat
Brand: Honeywell

Question 1

How do I reset the thermostat to factory default settings?

Accepted Answer

Navigate to Installer Setup Number 0710 in the Advanced Settings Menu and change the option from 0 to 1 to reset all Installer Setup options to default values and reset the schedule to default settings. Only the calendar settings and time are retained after the reset. To access Installer Setup, press the System key from the home screen, then press and hold the two blank keys on either side of the center blank key for approximately five seconds. (Page 17)

Question 2

How do I enter the Installer Setup menu on the TH8320U?

Accepted Answer

From the home screen, press the System key, then press and hold the two blank touch keys on either side of the center blank key for approximately five seconds until the screen changes. The thermostat must be powered either with AAA alkaline batteries or with a 24 Vac Common wire before entering setup. The Installer Setup Number is displayed in the lower left as a four-digit code. (Page 9)

Question 3

What type and how many batteries does the TH8320U thermostat require?

Accepted Answer

The thermostat requires three AAA alkaline batteries, which are included with the unit. The batteries are installed in the back of the thermostat, and you must make sure the positive and negative terminals are oriented correctly as marked on the device. Batteries are only needed if you are not using a 24 Vac Common wire to power the thermostat. (Page 7)

Question 4

Why is my thermostat display not turning on?

Accepted Answer

The thermostat is likely not receiving power. Check for 24 Vac between the C and Rc terminals, or verify that AAA batteries are installed correctly and are in good condition. Both power methods should be checked if the display remains off. (Page 20)

Question 5

Why is my heating or cooling not turning on when I change the setpoint?

Accepted Answer

The thermostat's minimum off-time protection may be activated, requiring you to wait up to five minutes for the system to respond. Additionally, check that the system selection is set to the correct position (Heat or Cool), and verify that Installer Setup Number 0170 has the correct system type chosen. For heat pumps, also confirm that the O/B terminal is set correctly in Installer Setup Number 0190. (Page 20)

Question 6

How do I set up a filter change reminder on the thermostat?

Accepted Answer

Go to Installer Setup Number 0500 in the Advanced Settings Menu and select an option from 1 to 6 to enable the furnace filter change reminder. The options range from 10 run-time days (option 1) up to 365 run-time days (option 6), with run time based on calls for the fan. The factory default setting is 0, which means the reminder is off. (Page 16)

Question 7

Where should I install the thermostat, and what locations should I avoid?

Accepted Answer

Install the thermostat approximately 5 feet (1.5 meters) above the floor in an area with good air circulation at average temperature. Avoid locations affected by drafts, dead spots behind doors or corners, hot or cold air from ducts, radiant heat from the sun or appliances, concealed pipes and chimneys, or unheated/uncooled areas such as an outside wall behind the thermostat. (Page 1-2)

Question 8

How do I activate the real-time clock on the TH8320U thermostat?

Accepted Answer

Locate and remove the tab labeled 'Remove' in the lower left corner on the back of the thermostat — this tab must be removed to activate the real-time clock. Once powered, the display will prompt you to enter the calendar date using the arrow keys, followed by pressing the Done key, and then set the current time. The thermostat is designed to keep the time and day in memory for up to ten years under normal use once the calendar is set. (Page 8)

Question 9

How do I lock the thermostat keypad to prevent unauthorized changes?

Accepted Answer

Go to Installer Setup Number 0670 in the Advanced Settings Menu and select option 1 for a partially locked keypad or option 2 for a fully locked keypad. A partially locked keypad allows only the temperature up and down keys and access to Installer Setup mode, while a fully locked keypad allows only access to Installer Setup mode. The factory default is 0 (unlocked), which makes all functions available. (Page 17)

Question 10

What are the default pre-programmed schedule settings on the TH8320U?

Accepted Answer

The default schedule includes four periods: Wake at 6:00 AM (Heat 70°F / Cool 78°F), Leave at 8:00 AM (Heat 62°F / Cool 85°F), Return at 6:00 PM (Heat 70°F / Cool 78°F), and Sleep at 10:00 PM (Heat 62°F / Cool 82°F). The fan setting defaults to Auto for all periods. The default system setting is Heat and the default fan setting is Auto. (Page 9)

Question 11

What heating and cooling system types are compatible with the TH8320U thermostat?

Accepted Answer

The TH8320U is compatible with gas, oil, or electric heat with air conditioning, heat only two-wire systems, warm air, hot water, high-efficiency furnaces, heat pumps, steam, gravity, heat only with fan, cool only, and 750 mV heating systems. It supports up to 3 Heat/2 Cool systems. (Page 1)

Question 12

What is the difference between the TH8110U, TH8320U, and TH8321U models?

Accepted Answer

The TH8110U supports 1 Heat/1 Cool systems, the TH8320U supports up to 3 Heat/2 Cool systems, and the TH8321U supports up to 3 Heat/2 Cool systems with the addition of dehumidification capability. All three are part of the VisionPRO TH8000 Series touch-screen programmable thermostats. (Page 1)

Question 13

How do I find the model number of my Honeywell VisionPRO thermostat?

Accepted Answer

To find the model number, pull the thermostat from the wallplate and turn it over. The model number is located on the back of the thermostat unit. (Page 1)

Question 14

Does the TH8320U thermostat support zone valve systems?

Accepted Answer

Yes, the TH8320U supports heat only systems using two-wire configurations, including power to open and close zone valves (Series 20) and normally open zone valves. This makes it compatible with a variety of hydronic heating setups. (Page 1)

Question 15

Is the TH8320U thermostat compatible with heat pump systems?

Accepted Answer

Yes, the TH8320U thermostat is compatible with heat pump systems. It is also compatible with a wide range of other system types including warm air, hot water, high-efficiency furnaces, steam, and gravity systems. (Page 1)

Question 16

Does the TH8320U thermostat contain any special materials that require special handling?

Accepted Answer

Yes, the thermostat contains a Lithium battery which may contain Perchlorate material, and special handling may apply. For more information, you can visit www.dtsc.ca.gov/hazardouswaste/perchlorate. (Page 1)

Question 17

How can I get help or technical support for the TH8320U thermostat?

Accepted Answer

For assistance, you can visit http://customer.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502. Both options are available to help with installation and troubleshooting. (Page 1)

Question 18

Can the TH8320U thermostat be used with a 750 mV heating system?

Accepted Answer

Yes, the TH8320U thermostat is compatible with 750 mV heating systems. This makes it suitable for use with millivolt heating systems such as certain gas fireplaces and floor furnaces. (Page 1)

Question 19

Is the TH8320U thermostat a touch-screen model?

Accepted Answer

Yes, the TH8320U is part of the VisionPRO TH8000 Series, which features a touch-screen programmable interface. It is designed to provide user-friendly control of compatible heating and cooling systems. (Page 1)

Question 20

Can the TH8320U thermostat be used for a cool only system?

Accepted Answer

Yes, the TH8320U thermostat supports cool only system configurations. It is designed to work across a wide variety of HVAC setups, including systems that only require cooling. (Page 1)

Question 21

What heating and cooling system types are compatible with the TH8320U1008 thermostat?

Accepted Answer

The TH8320U supports up to 3 Heat/2 Cool systems. Compatible system types include gas, oil, or electric heat with air conditioning, heat pumps, warm air, hot water, high-efficiency furnaces, steam, gravity, heat only, cool only, and 750 mV heating systems. It also supports two-wire systems, power to open and close zone valves (Series 20), and normally open zone valves. (Page 1)

Question 22

What is the difference between the TH8320U and the TH8321U models?

Accepted Answer

The TH8321U supports up to 3 Heat/2 Cool systems with dehumidification, while the TH8320U supports up to 3 Heat/2 Cool systems without dehumidification. Both models are covered in the same installation guide. (Page 1)

Question 23

How can I find the model number of my VisionPRO thermostat?

Accepted Answer

You can find the model number by pulling the thermostat from the wallplate and turning it over. The model number is printed on the back of the thermostat. (Page 1)

Question 24

Does the TH8320U1008 thermostat contain any hazardous materials I should be aware of?

Accepted Answer

Yes, the thermostat contains a Lithium battery which may contain Perchlorate material. Perchlorate material may require special handling, and you can find more information at www.dtsc.ca.gov/hazardouswaste/perchlorate. (Page 1)

Question 25

Is the TH8320U thermostat compatible with a heat-only two-wire system?

Accepted Answer

Yes, the TH8320U is compatible with heat-only two-wire systems. It also supports power to open and close zone valves (Series 20) and normally open zone valves. (Page 1)

Question 26

Can the TH8320U1008 thermostat be used with a heat pump system?

Accepted Answer

Yes, the TH8320U1008 thermostat is compatible with heat pump systems. It supports a wide range of system types including warm air, hot water, high-efficiency furnaces, and heat pumps. (Page 1)

Question 27

What type of display does the VisionPRO TH8000 Series thermostat have?

Accepted Answer

The VisionPRO TH8000 Series thermostat features a touch-screen interface. This is indicated in the product description as a 'Touch-screen Programmable Thermostat.' (Page 1)

Question 28

Is the TH8320U1008 thermostat programmable?

Accepted Answer

Yes, the TH8320U1008 is a programmable thermostat, as described in the VisionPRO TH8000 Series installation guide. It features a touch-screen interface for programming and control. (Page 1)

Question 29

How can I get help or support for my Honeywell TH8320U1008 thermostat?

Accepted Answer

You can get assistance by visiting http://customer.honeywell.com or by calling Honeywell Customer Care toll-free at 1-800-468-1502. Both options are provided for product support. (Page 1)

Question 30

What models are covered in the VisionPRO TH8000 Series installation guide?

Accepted Answer

The installation guide covers three models: the TH8110U for 1 Heat/1 Cool systems, the TH8320U for up to 3 Heat/2 Cool systems, and the TH8321U for up to 3 Heat/2 Cool systems with dehumidification. All three models are touch-screen programmable thermostats. (Page 1)

Question 31

Where should I install the Honeywell TH8320U1008 thermostat for optimal performance?

Accepted Answer

Install the thermostat about 5 feet (1.5 meters) above the floor in an area with good air circulation at average temperature. This location ensures accurate temperature readings and proper system control.

Question 32

What are the power requirements and options for the TH8320U1008 thermostat?

Accepted Answer

The TH8320U can be powered by either batteries or a common wire (24 Vac). The thermostat is designed to provide electronic control of 24 Vac heating and cooling systems or 750 mV heating systems.

Question 33

What does the WAIT message mean on my Honeywell thermostat display?

Accepted Answer

The WAIT message indicates that the thermostat's minimum off-time protection is activated to protect the compressor. This feature delays system reactivation for up to five minutes, so you should wait for the system to respond during this period.

Question 34

Why is my Honeywell TH8320U1008 thermostat screen blank and what should I do?

Accepted Answer

A blank screen may indicate a power issue rather than a battery problem. First, check the circuit breaker and reset if necessary, ensure the power switch at the heating and cooling system is on, and verify that the furnace door is securely closed. If the thermostat is battery-powered, install fresh AAA alkaline batteries correctly.

Question 35

Who should install the Honeywell TH8320U1008 thermostat?

Accepted Answer

The installer must be a trained, experienced service technician. It is important to follow all installation instructions carefully to avoid damaging the product or creating a hazardous condition.

Question 36

What system options are available on the TH8320U thermostat?

Accepted Answer

The TH8320U offers changeover system selection with automatic or heat-off-cool-manual options, and includes selectable heat pump settings with emergency heat. Fan selection includes on-auto-circ options that vary based on system type.

Question 37

What should I do before installing the TH8320U1008 thermostat?

Accepted Answer

Before installation, read all instructions carefully, check the ratings to ensure the product is suitable for your application, and ensure that a trained, experienced service technician performs the installation. After completing installation, use the instructions to check out the product operation.

Question 38

What is the proper disposal procedure if I'm replacing an old thermostat with mercury?

Accepted Answer

If the old thermostat contains mercury in a sealed tube, do not place it in the trash. Instead, contact your local waste management authority for instructions regarding proper recycling and disposal of the mercury-containing control.

Question 39

What are the key features of the TH8320U and TH8321U touch screen thermostats?

Accepted Answer

The TH8320U and TH8321U are universal programmable thermostats that provide electronic control of 24 Vac heating and cooling systems or 750 mV heating systems. They feature touch screen controls with options for system and fan selection that vary based on system type, including humidity sensor control for dehumidification.

Question 40

What should I check if my Honeywell thermostat is not responding?

Accepted Answer

First verify that the power supply is adequate by checking the circuit breaker and resetting if necessary, ensuring the power switch at the heating and cooling system is on, and confirming the furnace door is securely closed. For battery-powered models, ensure fresh AAA alkaline batteries are installed correctly.

Question 41

Where can I find the manual and installation instructions for the Honeywell TH8320U1008 thermostat?

Accepted Answer

The complete manual is available at http://yourhome.honeywell.com or you can call Honeywell Customer Care toll-free at 1-800-468-1502 for assistance. The TH8320U model is designed for up to 3 Heat/2 Cool systems and comes pre-programmed and ready to use right out of the box.

Question 42

How do I set the clock on my Honeywell thermostat?

Accepted Answer

Press the CLOCK button, then press the up or down arrow (s or t) to adjust the time. Press and hold the arrow to advance the time more quickly. Press DONE to save your changes or CANCEL to exit without saving. The thermostat automatically updates for daylight savings time.

Question 43

What are the fan settings available on the Honeywell T6/Pro Series thermostat?

Accepted Answer

There are three fan settings: On (fan always runs), Auto (fan runs only when heating or cooling is active), and Circ (fan runs randomly about 35% of the time). You can override programmed fan settings at any time by pressing the FAN button.

Question 44

How do I program energy-saving schedules on my Honeywell thermostat?

Accepted Answer

Press SCHED, then EDIT. Select the days you want to program (MON-SUN). Set four time periods: Wake (6:00 am at 70°), Leave (8:00 am at 62°), Return (6:00 pm at 70°), and Sleep (10:00 pm at 62°). These pre-set energy-saving settings can reduce heating/cooling expenses by up to 33%.

Question 45

What is Adaptive Intelligent Recovery on the Honeywell thermostat?

Accepted Answer

Adaptive Intelligent Recovery allows the thermostat to learn how long it takes your furnace and air conditioner to reach programmed temperatures. It automatically starts the system before your scheduled time so the desired temperature is reached exactly when you need it. The message 'Recovery' displays when this feature activates.

Question 46

How do I temporarily override the program schedule?

Accepted Answer

Press the up or down arrow (s or t) to immediately adjust the temperature. This temporarily overrides the current period's setting and will maintain the new temperature only until the timer expires. To cancel the temporary override at any time, press CANCEL or SCHED to resume the program.

Question 47

How do I use the vacation hold feature on my Honeywell thermostat?

Accepted Answer

Set the desired temperature, then press the up/down arrows to set the time the schedule should resume. Press HOLD twice, then use the arrows to select the number of days. The thermostat will maintain your set temperature for the specified days, then automatically resume the programmed schedule.

Question 48

How do I replace the batteries in my Honeywell thermostat?

Accepted Answer

Install 3 fresh AAA alkaline batteries immediately when the LO BATT warning begins flashing. The warning appears about 30 days before batteries are depleted. Even without a warning, replace batteries once a year or before leaving home for more than a month.

Question 49

Why is 'Wait' displayed on my thermostat screen?

Accepted Answer

The 'Wait' message indicates the compressor protection timer is active. The compressor must wait a few minutes before restarting to prevent equipment damage. You should wait approximately 5 minutes for the system to restart safely.

Question 50

What should I do if the display is blank or my thermostat is not responding to key presses?

Accepted Answer

First, check that the circuit breaker is on and reset it if necessary. Ensure the power switch at your heating and cooling system is on and the furnace door is closed securely. If battery-powered, install fresh AAA alkaline batteries. Verify that the thermostat is not locked by checking advanced function 0670 on page 25.

Question 51

What are the installation steps for the Honeywell TH8320U1008 thermostat?

Accepted Answer

First, turn off power to your HVAC system at the circuit breaker. Remove the old thermostat and wall plate, then mount the new Honeywell wall plate level using provided screws. Connect labeled wires to corresponding terminals on the wall plate, push excess wire into the wall, and finally align and snap the thermostat body onto the wall plate.

Question 52

How do I program a temperature schedule on my Honeywell TH8320U1008?

Accepted Answer

Press the 'Schedule' button on the screen and select which days to program (All Days, Weekdays, Weekend, or individual days). For each period (Wake, Leave, Return, Sleep), set your desired temperature and time, then confirm to save. You can also use the 'Armchair Programming' feature by detaching the thermostat from its wall plate to program more comfortably.

Question 53

What should I do if the display on my TH8320U1008 is blank?

Accepted Answer

Check and reset the circuit breaker if needed, verify the power switch at your heating and cooling system is on, and ensure the furnace door is closed securely. If the thermostat is battery powered, install fresh AAA alkaline batteries with correct polarity.

Question 54

How do I replace the batteries in the Honeywell TH8320U1008?

Accepted Answer

Grasp the thermostat and pull it to remove it from the wall plate. Install three fresh AAA alkaline batteries, making sure to observe the correct polarity. Reattach the thermostat to the wall plate when finished.

Question 55

What does the 'LO BATT' error code mean on my thermostat?

Accepted Answer

The 'LO BATT' error indicates that your batteries are low and need to be replaced with fresh AAA alkaline batteries.

Question 56

What does the 'WAIT' error message mean and what should I do?

Accepted Answer

The 'WAIT' message indicates that the compressor protection timer is active. Wait 5 minutes for the system to restart safely without damaging the compressor before attempting further operations.

Question 57

How do I lock my Honeywell thermostat to prevent unauthorized changes?

Accepted Answer

Press and hold the 'Hold' button for 5 seconds to lock the thermostat. Press and hold it again for 5 seconds to unlock it.

Question 58

What temperature ranges are supported by the TH8320U1008?

Accepted Answer

The thermostat supports heating temperatures from 40°F to 90°F (4.5°C to 32°C) and cooling temperatures from 50°F to 99°F (10°C to 37°C). Make sure temperature settings fall within these acceptable ranges for proper operation.

Question 59

Why is my heating or cooling system not responding to the thermostat?

Accepted Answer

Verify that the system mode is set correctly—press SYSTEM to set Heat and ensure the temperature is higher than the indoor temperature, or set Cool and ensure it's lower. Also check the circuit breaker and reset if necessary, confirm the power switch at your heating/cooling system is on, and make sure the furnace door is closed securely. If 'WAIT' is displayed, wait 5 minutes for the compressor protection timer to finish.

Question 60

What is the power source and backup power requirement for the TH8320U1008?

Accepted Answer

The thermostat operates on 30 volts and requires three AAA alkaline batteries (not included) for battery backup. The batteries should be installed with correct polarity to ensure proper operation.

Honeywell Th8320U1008 Thermostat

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