Table of Contents
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Thermostat Interface
Setpoint
periods
Days of week
Current time /
Timer
Menu items
Alert / Fault
Timed override
Standby mode
Home screen
Status Icons
Schedule On: Programmed schedule is active.
Schedule Override: Active until next scheduled period
starts or the timed override duration has ended.
Schedule Off: Programmed schedule is turned off.
Low Battery: Power has reached approximately 10% - flashes
when critically low (see Changing the Batteries).
Heat Demand: Room temperature is below setpoint - indicating
there is a demand for heating (boiler activity might occur).
Wireless Signal: Thermostat (T4R only) is connected to the Receiver Box.
Room
Setpoint
temperature
temperature
Back
Away mode
4
Heat
Low
demand
battery
Wireless Signal
(T4R only)
Schedule
status
Temperature
adjustment /
Menu navigation
Menu
Confirm
Cancel
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Table of Contents
Need help?
Do you have a question about the T4 and is the answer not in the manual?
Questions and answers
How to adjust temperature on/off range. ie. if room temperature set at 70 degrees, I want heat to go on if temperature gets below 68 (or some other level) and heat to go off once room reaches 70.
To adjust the temperature on/off range for the Honeywell T4 thermostat, follow these steps:
1. Access the Installer Setup Menu:
- Press and hold the Menu and + (Up) buttons together for about 5 seconds.
- This will enter the installer settings mode.
2. Navigate to Temperature Limits:
- Use the + (Up) or - (Down) buttons to scroll through the settings.
- Look for the maximum temperature limit (range stop high) and minimum temperature limit (range stop low) options.
3. Adjust the Temperature Range:
- Select the desired maximum and minimum temperature limits using the + (Up) or - (Down) buttons.
- Confirm the selection by pressing Select or Done (depending on the model).
4. Save and Exit:
- Continue scrolling until you see the option to Exit or Done.
- Press the corresponding button to save the settings and return to the home screen.
This will allow you to change the maximum and minimum temperature settings according to your needs.
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Is tHere a special setting for oil fired boilers in the t4r menu
Yes, the Honeywell T4 has a special setting for oil-fired boilers. The minimum ON time should be set to 4 minutes, and the cycle per hour should be set to 3.
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Hi, I used the - to turn the temperature down to 19 C . Now I think it has set to be 19C 24 h constantly On the right side it says auto. How do I know it it is turned to the auto settings? Or it is on constant override?
On the Honeywell T4 thermostat screen, check the fan setting. If it displays "Fan Auto," the thermostat is set to automatic mode, meaning the fan will run only when heating or cooling is active. If it displays "Fan On," the thermostat is in constant override mode, meaning the fan runs continuously regardless of heating or cooling status.
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How do I change the batteries
To change the batteries in a Honeywell T4 thermostat:
1. Turn off the thermostat by selecting the "Off" mode.
2. Remove the thermostat from the wall by detaching it from the backing plate.
3. Locate and remove the two AA batteries from the back of the thermostat.
4. Check the battery terminals for any corrosion and clean them with a Q-tip and isopropyl alcohol if needed.
5. Insert new AA batteries, ensuring correct polarity.
6. Reattach the thermostat to the wall plate.
7. Turn the thermostat back on and ensure it functions properly.
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I want to set on manual only too switch on and off.
To set the Honeywell T4 thermostat to manual mode (turning the schedule off and following a single adjustable temperature), follow these steps:
1. Press the ▲ or ▼ button to select the schedule menu and press OK.
2. Press the ▲ or ▼ button to select OFF and press OK.
3. Press the ▲ or ▼ button to adjust the permanent temperature.
4. To revert to the schedule mode, repeat the steps and choose ON instead.
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