PRO 4000 5-2 Day Programmable Thermostat

PRO 4000

Simple by design. Quality by reputation.

There’s a reason why Honeywell is the No. 1 brand of thermostats: it’s thermostats like our PRO 4000 5-2 Day Programmable Thermostat. You can set one program for weekdays and another for weekends to save on energy costs and maintain comfort. Other features are designed for you, such as the easy-to-read digital display and a special slide switch for selecting heat, cool or operating the fan. Even the instructions for using the thermostat are built in, so they’re easily accessible.

  • Weekday/weekend programming
  • Digital display
  • Display options (available in backlit or standard)
  • Built-in instructions
  • Five-year warranty
  • Professional installation
Program to suit your weekday/weekend schedule
Precision Temperature Control
Within +/-1 degree F for maximum comfort
Basic Operation
Simple to operate. Use slide switch to select heat or cool mode or operate the fan.
  • Model numbers: TH4110D1007, TH4210D1005
  • Color: White
  • Dimensions: 3-13/16 in. High X 5-3/8 in. Wide X 1-1/4 in. Deep


Each Honeywell thermostat model has a unique number that can help you get support for your product faster and easier . Depending on your model, this number is preceded by the letters TH, T, RTH, CT, TL or RLV.

Please watch this video for a quick visual guide on how to find your thermostat model number:

The fastest way to see your thermostat model number is to look for it on your thermostat ID card. If you do not have a product ID card, the fastest way to find the model number is by removing the thermostat from the wall-plate. Depending on your model, the thermostat will separate from the wall-plate with moderate pressure or there might be small screws holding the device in place. After removing the thermostat, flip it over and look for the model number, which is printed on the back of the case, starting with the group of letters mentioned above.

If the thermostat is battery operated and the batteries are accessed from the front of the thermostat, please check the area around the batteries. You can also check this list of our battery operated thermostats to find your model number.

If your thermostat has a mechanical clock, the model number is on a sticker on the horizontal surface above the clock.

Yes, the packaging contained with the thermostat is recyclable. Information about recycling thermostats containing mercury can be found at:
The thermostat takes the temperature override as a need to reach the new temperature setting right away. It will run the second or third stage only as long as necessary to reach new temperature setting.
"Auto" under "System" indicates that it is setup to automatically switch between heating and cooling. If your thermostat does not show auto, you may not have this feature.
The changeover valve is a device which reverses the flow of refrigerant in the heat pump. This will allow the freon to reverse and heat the home or cool the home. Honeywell uses an O terminal to energize the valve in cooling and a B terminal to energize the valve in heating. Some manufacturers of heat pumps may use the B terminal to energize in heating, while a vast majority energize the O terminal in cooling.
The FAN selection key has two or three positions: Auto and On and sometimes Circ (Circulate). The Auto position will allow the system fan to operate whenever the heating or cooling system is turned on by the thermostat. The On position will turn the fan on to run continuously, regardless whether heating or cooling system is turned on by the thermostat or not. The Circ (Circulate) position if available will run the fan approximately 35% of the time, minus any time the fan will run with the heating or cooling system.
Honeywell offers thermostats for both low voltage (24 volts) and line voltage (120 or 240 volts) systems. The most common type of voltage from a central heating and/or cooling system is 24 volts (24Vac). The old thermostat may say somewhere on the thermostat that it is for 24 volt (24Vac) or maximum 30 volts (30Vac). If you see 120 Vac or 240 Vac on the thermostat, a low voltage thermostat will NOT work with your system. You will need a line voltage thermostat. This type of voltage is common with electric baseboard heating. Regardless of the voltage, Honeywell strongly suggests that you turn off the power to the system at the furnace, at the fuse, or at the circuit breaker panel before installing or replacing a thermostat. If you are unsure about your voltage, please contact a local heating and cooling contractor in your area for assistance.
Your thermostat is designed to control temperature to +/- 1 F. How often your heat turns on and off depends on several factors including the type of heating system you have and load conditions (in other words, how hot or cold it is outside). A typical mid-efficiency forced air system will cycle about five times in an hour (5CPH) under typical load conditions. A typical high efficiency furnace or hot water system would cycle less than that. The installer can adjust the cycle rate setting on the thermostat.
A heat pump uses the outdoor unit for both heating and cooling. Often the heat pump also has some sort of backup or auxiliary heat for when it is cold outside. The backup or auxiliary heat could be electric heat strips or a fossil fuel furnace. Thermostats that control heat pumps with backup or auxiliary heat typically have an Em Heat (Emergency heat) position. When the system switch is moved to the Em Ht. position, the auxiliary heat is activated on a call for heat. The compressor is disabled. If replacing a thermostat on a heat pump system, verify your thermostat is compatible.
Honeywell thermostats do not have the capability of making an audible noise such as a beeping sound. The noise you are hearing is likely from another electronic device which is near the thermostat. Check for a smoke detector, door bell, or security system.

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Download PDF
PRO 4000 5-2 Day Programmable Thermostat Operating Manual
Model: TH4000
English, French
Download PDF
PRO 4000 5-2 Day Programmable Thermostat Owner's Manual
Model: TH4110D1007, TH4210D1005
English, French, Spanish
Download PDF
PRO 4000 5-2 Day Programmable Thermostat Product Information Sheet
Model: TH4110, TH4210, TH4000, TH4110D1007, TH4110D1015, TH4210D1005, TH4210D1013
English, French, Spanish

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