Honeywell T4 Pro Thermostat
Optional Cover Plate installation
Use the Optional Cover Plate when:
- Mounting the thermostat to an electrical junction box
- Or when you need to cover paint gap from old thermostat.
- Separate the Junction Box Adapter from the Cover Plate. See Figure 1.
- Mount the Junction Box Adapter to the wall or an electrical box using any of the eight screw holes. Insert and tighten mounting screws supplied with Cover Plate Kit. Do not overtighten. See Figure 2. Make sure the Adapter Plate is level.
- Attach the UWP by hanging it on the top hook of the Junction Box Adapter and then snapping the bottom of the UWP in place. See Figure 3.
- Snap the Cover Plate onto the Junction Box Adapter. See Figure 4.
UWP Mounting System installation - Before starting, turn the power off at the breaker box or switch. Open package to find the UWP. See Figure 5.
- Position the UWP on wall. Level and mark hole positions. See Figure 6.
- Drill holes at marked positions, and then lightly tap supplied wall anchors into the wall using a hammer.
- Drill 7/32” holes for drywall.
- Pull the door open and insert the wires through wiring hole of the UWP. See Figure 7.
- Place the UWP over the wall anchors. Insert and tighten mounting screws supplied with the UWP. Do not overtighten. Tighten until the UWP no longer moves. Close the door. See Figure 8.
UWP Mounting System installation
Power options
Insert R and C wires into designated terminals for primary AC power (C terminal is optional if batteries are installed, but it is recommended). Remove wires by depressing the terminal tabs.
Insert AA batteries for primary or backup power.
Setting Slider Tabs
Set R Slider Tab
- Use built-in jumper (R Slider Tab) to differentiate between one or two transformer systems.
- If there is only one R wire, and it is connected to the R, RC, or RH terminal, set the slider to the up position (1 wire).
- If there is one wire connected to the R terminal and one wire connected to the Rc terminal, set the slider to the down position (2 wires).
UWP Mounting System
Wiring terminal designations
| S | Universal input for wired indoor or outdoor sensors | L/A – A | Heat Pump fault input (most common case) | |
| S | O/B | Changeover valve | ||
| Y | Compressor contactor (stage 1) | AUX – W2 | Auxiliary heat relay Heat relay (stage 2) | |
| Y2 | Compressor contactor (stage 2) | E | Emergency Heat relay | |
| G | Fan Relay | W | Heat relay (stage 1) | |
| C | 24VAC common. For 2 transformer systems, use common wire from cooling transformer. | K | Connect to K on Wire Saver Module** | |
| U |
Unused | R | 24VAC power from heating transformer* | |
| U | Rc | 24VAC power from cooling transformer* |
- Terminal can be jumped using Slider Tab. See “Setting Slider Tabs” above.
- The THP9045A1023 Wire Saver Module is used on heat/cool systems when you only have four wires at the thermostat, and you need a fifth wire for a common wire. Use the K terminal in place of the Y and G terminals on conventional or heat pump systems to provide control of the fan and the compressor through a single wire the unused wire then becomes your common wire. See THP9045 instructions for more information.
Wiring conventional systems: forced air and hydronics
- 1H/1C System (1 transformer)
- R Power [1]
- RC [R +RC joined by Slider Tab] [2]
- Y Compressor contactor
- C 24VAC common [3]
- W Heat relay
- G Fan relay
Heat-only System R Power [1]
- RC [R +RC joined by Slider Tab] [2]
- C 24VAC common [3]
- W Heat relay
Heat-only System (Series 20) [5]
- R Series 20 valve terminal “R” [1]
- RC [R +RC joined by Slider Tab] [2]
- Y Series 20 valve terminal “W”
- C 24VAC common [3]
- W Series 20 valve terminal “B”
Heat-only System
- (power open zone valve) [5]
- R Power [1]
- RC [R+ RC joined by Slider Tab] [2]
- W Valve
- C 24VAC common [3]
1H/1C System (2 transformers)
- R Power (heating transformer) [1]
- RC Power (cooling transformer) [1]
- Y Compressor contactor
- C 24VAC common [3, 4]
- W Heat relay
- G Fan relay
Heat-only System with Fan
- R Power [1]
- RC [R+ RC joined by Slider Tab] [2]
- C 24VAC common [3] W Heat relay
- G Fan relay
Cool-only System R Power [1]
- RC [R+ RC joined by Slider Tab] [2]
- Y Compressor contactor
- C 24VAC common [3]
- G Fan relay
2H/2C System (1 transformer) [6]
- R Power [1]
- RC [R+ RC joined by Slider Tab] [2] Y Compressor contactor (stage 1) C 24VAC common [3]
- W Heat relay (stage 1)
- G Fan relay
- W2 Heat relay (stage 2)
- Y2 Compressor contactor (stage 2)
Wiring heat pump systems
- 1H/1C Heat Pump System
- R Power [1]
- RC [R+RC joined by Slider Tab] [2]
- Y Compressor contactor C 24VAC common [3]
- O/B Changeover valve [7]
- G Fan relay
2H/1C Heat Pump System [8]
- R Power [1]
- RC [R+RC joined by Slider Tab] [2]
- Y Compressor contactor C 24VAC common [3]
- O/B Changeover valve [7]
- G Fan relay
- Aux Auxiliary heat
- E Emergency heat relay
- L Heat pump fault input
2H/2C Heat Pump System [9]
- R Power [1]
- RC [R+RC joined by Slider Tab] [2]
- Y Compressor contactor (stage 1)
- C 24VAC common [3]
- O/B Changeover valve [7] G Fan relay
- Y2 Compressor contactor (stage 2)
- L Heat pump fault input
3H/2C Heat Pump System
- (TH6320U only) [10]
- R Power [1]
- RC [R+RC joined by Slider Tab] [2]
- Y Compressor contactor (stage 1)
- C 24VAC common [3]
- O/B Changeover valve [7]
- G Fan relay
- Aux Auxiliary heat
- E Emergency heat relay
- Y2 Compressor contactor (stage 2)
- L Heat pump fault input
Dual Fuel System
- R Power [1]
- RC [R+RC joined by Slider Tab] [2]
- Y Compressor contactor (stage 1)
- C 24VAC common [3]
- O/B Changeover valve [7] G Fan relay
- Aux Auxiliary heat
- E Emergency heat relay
- Y2 Compressor contactor (stage 2 – if needed)
- L Heat pump fault input
- S Outdoor sensor
- S Outdoor sensor
Thermostat mounting
- Push excess wire back into the wall opening.
- Close the UWP door. It should remain closed without bulging.
- Align the UWP with the thermostat, and push gently until the thermostat snaps in place.
- Turn the power on at the breaker box or switch.
System operation settings
- Press the Mode button to cycle to the next available System mode.
- Cycle through the modes until the required System mode is displayed and leave it to activate.
System modes
- Auto
- Heat
- Cool
- EM Heat
- Off
Fan operation settings
- Press the Fan button to cycle to the next available Fan mode.
- Cycle through the modes until the required Fan mode is displayed and leave it to activate.
Fan modes
- Auto: Fan runs only when the heating or cooling system is on.
- On: Fan is always on.
- Circ: Fan runs randomly about 33% of the time.
Installer setup (ISU)
- Press and hold CENTER and buttons for approximately 3 seconds to enter advanced menu.
- Press Select to enter ISU.
- Press Select to cycle through menu setup options.
- Press or to change values or select from available options.
- Press Select and confirm your settings or press Back to ignore changes and return to ISU menu screen to continue editing another setup option.
- To finish setup process and save your setting, press Home and return to Home screen.
Advanced setup options (ISU)
| # ISU | ISU Name | ISU Options (factory default in bold) |
| 120 | Scheduling Options | 0 = Non-Programmable 2 = 5-2 Programmable 3 = 5-1-1 Programmable 4 = 7-Day Programmable |
| 125 | Temperature Indication Scale | 0 = Fahrenheit 1 = Celsius |
| 130 | Outdoor Sensor (TH6320 / TH6220 only) | 0 = None 1 = Wired Outdoor Sensor |
| 200 | Heating System Type | 1 = Conventional Forced Air Heat 2 = Heat Pump 3 = Radiant Heat 5 = None (Cool Only) |
| 205 | Heating Equipment Type | Conventional Forced Air Heat: 1 = Standard Efficiency Gas Forced Air 2 = High Efficiency Gas Forced Air 3 = Oil Forced Air 4 = Electric Forced Air 5 = Hot Water Fan Coil Heat Pump: 7 = Air to Air Heat Pump 8 = Geothermal Heat Pump Radiant Heat: 9 = Hot Water Radiant Heat 12 = Steam |
| 218 | Reversing Valve O/B | 0 = O (O/B in Cool) 1 = B (O/B in Heat) |
| 220 | Cool Stages / Compressor Stages 200=Conv / 200=HP (TH6320 / TH6220 only*) | 0, 1, 2* |
| # ISU | ISU Name | ISU Options (factory default in bold) | |
| 221 | Heat Stages / Backup Heat Stages | Heat Stages: 1, 2 Backup Heat Stages: 0, 1 | |
| 230 | Fan Control in Heat | 1 = Equipment Controls Fan 2 = Thermostat Controls Fan | |
| 253 | Aux/E terminal control (TH6320 only) | 0 = Drive both Aux & E together 1 = Aux and E independent | |
| 255 | Backup Heat Source (Heat Pump Only) | 1 = Electric Forced Air 2 = Gas/Oil Forced Air (or Fossil Forced Air) | |
| 256 | Emergency Heat Source (TH6320 only) | 1 = Electric Forced Air 2 = Gas/Oil Forced Air (or Fossil Forced Air) | |
| 260 | External Fossil Fuel Kit (TH6320 / TH6220 only) | 0 = Thermostat Controls Backup Heat 1 = External Fossil Fuel Kit Controls Backup Heat | |
| 270 | Backup Heat Fan | 1 = Equipment Controls Fan 2 = Thermostat Controls Fan Note: Setting only active with TH6320 in Heat Pump mode. | |
| 271 | Emergency Heat Fan | 1 = Equipment Controls Fan 2 = Thermostat Controls Fan Note: Setting only active with TH6320 in Heat Pump mode. | |
| 300 | System Changeover | 0 = Manual 1 = Automatic | |
| 303 | Auto Changeover Differential | 0 °F to 5 °F 0.0 °C to 2.5 °C Note: Differential is NOT deadland. Differential means how far past the setpoint before switching to the mode selected. Deadland setup is not an option. Honeywell uses an advanced algorithm that fixes deadland at 0 °F. This is more advanced than previous thermostats. | |
| 340 | Backup Heat Droop | 0 = Comfort 2 = 2 °F 3 = 3 °F 4 = 4 °F 5 = 5 °F 6 = 6 °F 7 = 7 °F 8 = 8 °F | 9 = 9 °F 10 = 10 °F 11 = 11 °F 12 = 12 °F 13 = 13 °F 14 = 14 °F 15 = 15 °F |
| 350 | Upstage Timer for Backup Heat | 0 = Off 1 = 30 minutes 2 = 45 minutes 3 = 60 minutes 4 = 75 minutes 5 = 90 minutes 6 = 2 hours 7 = 3 hours 8 = 4 hours 10 = 5 hours | |
| 355 | Compressor Lockout / Balance Point | — = Off 5 °F to 60 °F (in 5 °F increments) -15.0 °C to 15.5 °C (in 2.5 °C or 3.0 °C increments) Note: Use a wired sensor to set compressor lockout / balance point on TH6320 / TH6220. | |
| 356 | Outdoor Lockout Backup Heat | — = Off 5 °F to 65 °F (in 5 °F increments) -15.0 °C to 18.5 °C (in 2.5 °C or 3.0 °C increments) | |
| 365 | Compressor Cycle Rate (Stage 1) | 1 – 6 | |
| 366 | Compressor Cycle Rate (Stage 1) | 1 – 6 | |
| 370 | Heating Cycle Rate (Stage 1) | 1 – 12 | |
| 371 | Heating Cycle Rate (Stage 2) | 1 – 12 | |
| # ISU | ISU Name | ISU Options (factory default in bold) | |
| 375 | Heating Cycle Rate Auxiliary Heat | 1 – 12 | |
| 378 | Heating Cycle Rate Emergency Heat (TH6320 only) | 1 – 12 | |
| 387 | Compressor Protection | 0 = Off 1 – 5 minutes | |
| 425 | Adaptive Intelligent Recovery | 0 = No 1 = Yes Note: Adaptive Intelligent Recovery (AIR) is a comfort setting. Heating or cooling equipment will turn on earlier, ensuring the indoor temperature will match the setpoint at the scheduled time. | |
| 430 | Minimum Cool Setpoint | 50 °F to 99 °F (50 °F) 10.0 °C to 37.0 °C (10.0 °C) | |
| 431 | Maximum Heat Setpoint | 40 °F to 90 °F (90 °F) 4.5 °C to 32.0 °C (32.2 °C) | |
| 435 | Keypad Lockout | 0 = None 1 = Partial 2 = Full | |
| 500 | Is Indoor Temperature Sensor WIRED to your system? (TH6320 / TH6220 only) | 0 = No 1 = Yes | |
| 515 | Indoor Sensor type (TH6320 / TH6220 only) | 0 = 10k 1 = 20k | |
| 520 | Which Sensors will be used for TEMPERATURE Control? (Multiple Sensors are Averaged) (TH6320 / TH6220 only) | 1 = Thermostat Only 2 = Wired Only 3 = Average | |
| 702 | Number of Air Filters | 0 – 2 | |
| 711 | Air Filter 1 Replacement Reminder | 0 = Off 1 = 10 Run Time Days 2 = 20 Run Time Days 3 = 30 Run Time Days 4 = 45 Run Time Days 5 = 60 Run Time Days 6 = 90 Run Time Days 7 = 120 Run Time Days 8 = 150 Run Time Days 9 = 30 Calendar Days | 10 = 45 Calendar Days 11 = 60 Calendar Days 12 = 75 Calendar Days 13 = 3 Calendar Months 14 = 4 Calendar Months 15 = 5 Calendar Months 16 = 6 Calendar Months 17 = 9 Calendar Months 18 = 12 Calendar Months 19 = 15 Calendar Months |
| 712 | Air Filter 2 Replacement Reminder | 0 = Off 1 = 10 Run Time Days 2 = 20 Run Time Days 3 = 30 Run Time Days 4 = 45 Run Time Days 5 = 60 Run Time Days 6= 90 Run Time Days 7 = 120 Run Time Days 8 = 150 Run Time Days 9 = 30 Calendar Days | 10 = 45 Calendar Days 11 = 60 Calendar Days 12 = 75 Calendar Days 13 = 3 Calendar Months 14 = 4 Calendar Months 15 = 5 Calendar Months 16 = 6 Calendar Months 17 = 9 Calendar Months 18 = 12 Calendar Months 19 = 15 Calendar Months |
| 1400 | Backlighting | 0 = On Demand 1 = Continuous Note: Common wire needed for continuous. | |
| 1401 | Backlight brightness | 1 – 5 Note: Only displayed if continuous backlight selected. | |
| 1410 | Clock Format | 12 / 24 | |
| 1415 | Daylight Saving Time | 0 = Off 1 = On | |
| 1420 | Temperature Display Offset | -3 to 3F (0) -1.5 to 1.5C (0) | |
Installer system test
To perform a System Test:
- Press and hold CENTER and + buttons for approximately 3 seconds to enter advanced menu.
- Use + to go to TEST. Press Select to enter System Test.
- Use + to change between Heat, Cool, Fan, EM Heat, or Ver (thermostat version information). Press Select.
- Press+ to turn stages on one at a time, and press_ to turn them off.
- Use the Home button to exit the System Test.
| System test | System status | |
| Shaded areas below apply only to TH6320U/TH6220U or as otherwise noted. | ||
| 0 | All Off | |
| 1 | Heat Stage 1 on | |
| Heat | ||
| 2 | Heat Stage 2 also on | |
| 3 | Heat Stage 3 also on | |
| 0 | All Off | |
| Cool | 1 | Cool Stage 1 on |
| 2 | Cool Stage 2 also on | |
| 0 | All Off | |
| Em Heat | ||
| 1 | Em Heat on | |
| 0 | Fan Off | |
| Fan | ||
| 1 | Fan On | |
Specifications
Temperature Ranges
Heat: 40 °F to 90 °F (4.5 °C to 32.0 °C)
Cool: 50 °F to 99 °F (10.0 °C to 37.0 °C)
Working Ambient Temperature
32 °F to 120 °F (0 C° to 48.9 °C)
Operating Ambient Temperature
37 °F to 102 °F (2.8 °C to 38.9 °C)
Shipping Temperature
-20 °F to 120 °F (-28.9 °C to 48.9 °C)
Operating Relative Humidity
5% to 90% (non-condensing)
Physical Dimensions in inches (mm) (H x W x D)
4-1/16” H x 4-1/16” W x 1-5/32” D
103.5 mm H x 103.5 mm W x 29 mm D
Electrical Ratings
| Terminal | Voltage (50/60Hz) | Running Current |
| W Heating | 20-30 Vac | 0.02-1.0 A |
| (Powerpile) | 750 mV DC | 100 mA DC |
| W2 (Aux) Heating | 20-30 Vac | 0.02-1.0 A |
| E Emergency Heat | 20-30 Vac | 0.02-0.5 A |
| Y Compressor Stage 1 | 20-30 Vac | 0.02-1.0 A |
| Y2 Compressor Stage 2 | 20-30 Vac | 0.02-1.0 A |
| G Fan | 20-30 Vac | 0.02-0.5 A |
| O/B Changeover | 20-30 Vac | 0.02-0.5 A |
| L/A Input | 20-30 Vac | 0.02-0.5 A |
Customer assistance
For assistance with this product, please visit customer.honeywell.com. Or call Honeywell Customer Care toll-free at 1-800-468-1502.
Pull to remove the thermostat from the UWP.
For more manuals by Honeywell visit, ManualsLibraryy
Honeywell T4 Pro Thermostat-FAQs
How do I manually adjust my Honeywell thermostat?
To manually adjust your Honeywell thermostat, use the “+” and “-” buttons to set your preferred temperature. Press the “Hold” button to maintain that temperature until you manually change it again.
How do I reset my Honeywell T4 Pro thermostat?
To perform a factory reset:
Press and hold the Menu button.
Press the “>” button until you see “Reset,” and select it.
Press “>” again until you see “Factory Reset” and select it.
Your thermostat is now reset, and you can configure it with new settings.
How do I reset my Honeywell thermostat with three buttons?
To reset using the three-button method:
Turn off the thermostat using the power button.
Hold down the “Fan” button and the “Up” arrow button.
Release both buttons, then press the “Fan” button again to complete the reset.
Does the Honeywell T4 Pro connect to Wi-Fi?
Yes, the Honeywell T4 Pro can connect to Wi-Fi using the Lyric app. This allows you to control the thermostat remotely from a smartphone or tablet. Simply follow the on-screen menu for easy Wi-Fi setup.
How do I turn off my Honeywell T4 Pro thermostat?
To turn off the thermostat:
Press the Menu button.
Scroll to “LOCK” and select it.
Scroll to “OFF” and select it to turn off the thermostat.
How do I set a schedule on my Honeywell Pro thermostat?
To set a schedule, go to the settings menu, then select the “home and away” option. Here, you can program the temperatures, times, and days you want the thermostat to follow. After choosing your settings, press “Set Schedule” to activate it.
How do I reset my thermostat?
To reset a thermostat, remove the batteries, flip them for 5 seconds, and then put them back in their normal position. This will reset the thermostat to its factory settings.
How can I fix my Honeywell thermostat if it’s not working?
Check the power source and replace the batteries or check the circuit breaker if it’s hardwired. Inspect the wiring for any damage, and if needed, perform a reset to resolve minor issues.
How do I unlock my Honeywell T4 Pro thermostat?
To unlock the thermostat:
Press the center button on the locked home screen.
Enter the passcode (default is 1234).
Use the Plus and Minus buttons to change the digits if needed, then press Select.
Does the Honeywell T4 Pro require a C wire?
Yes, the Honeywell T4 Pro uses a C wire (24 VAC) for power, but it can also run on a disposable battery. The C wire is optional depending on your setup.
How do I control the temperature on my Honeywell thermostat?
You can control the temperature by using the up and down buttons or a dial. If your thermostat is programmable, you may need to enter a programming mode to set schedules for different times of the day or week.