How do I find my Thermostat model number?

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, RCHT, 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. Most modern thermostats separate from the wall plate by pulling the thermostat straight off the wall.  Grasp the thermostat with the fingers of your hand on the top and your thumb on the bottom and try pulling the thermostat directly off the wall plate.  If it does not separate you will need to refer to your owners guide as to how it removes from the wall. 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.

Why is the “Cool On,” “Heat On,” “Snowflake,” or “Flame” blinking on the thermostat display?

The thermostat has a built-in 5 minute delay to protect your equipment. If “wait” is in the screen or “cool on” is flashing – wait 5 minutes for the system to safely respond.

Is the packaging for this thermostat recyclable?

Yes, the packaging contained with the thermostat is recyclable. Information about recycling thermostats containing mercury can be found at: thermostat-recycle.org/

Why is my cooling not working?

There are several items you can check. First check that the thermostat is set to the Cool position. Make sure the temperature is set lower than the Inside temperature reading. Also check the circuit breaker and reset if necessary. Make sure that the furnace door is closed securely. If “wait” is in the screen or “cool on” is flashing – wait 5 minutes for the system to safely respond. The thermostat will indicate it is asking for the cooling to turn on when “cool on” or a “snowflake” in the display. If this message is in the display, the thermostat is asking for the heat to be on and there is a likely a problem outside of the thermostat preventing the cooling from running.

Why is my thermostat starting the heat or cool before the program time?

The thermostat has a feature called Adaptive Intelligent Recovery(AIR) or Smart Response or Early Start. This allows the thermostat to “learn” how long the heating and cooling system will take to reach the programmed temperature settings. So the temperature is reached at the time you set. For example: Set the Wake time to 6am, and the temperature to 70F. The heat will come on before 6am, so the temperature is 70F by the time you wake at 6am. The message “recovery” is displayed when the system is activated before a scheduled time period.

Why is my heat not working?

There are several items you can check.

  • First check that the thermostat is set to the Heat position. Make sure the temperature is set higher than the Inside temperature reading.
  • Also check the circuit breaker and reset if necessary.
  • Make sure that the furnace door is closed securely.
  • If “wait” is in the screen or “heat on” is flashing – wait 5 minutes for the system to safely respond.
  • The thermostat will indicate it is asking for the heat to turn on when “heat on” or a “flame” in the display. If this message is in the display, the thermostat is asking for the heat to be on and there is a likely a problem outside of the thermostat preventing the heat from running.

Please see the steps below to troubleshoot this issue:

  1. Verify the call for heat is being made
  2. Check the configuration of the thermostat to make sure it is controlling the equipment properly.
  3. Verify that the thermostat is wired correctly.
  4. Make sure all of the wires are secure and in the correct terminals.
  5. Make sure the voltages are between 18 and 30 VAC or 20 and 30 VAC depending on the thermostat model.
  6. Make sure the thermostat faceplate is firmly in place against the wall plate

For more information on the Honeywell heating and cooling systems, please click here to see a list of instructional videos.

Stage two of heat or cool turns on right away when I move the temperature higher or lower. Why?

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.

What is a changeover valve on a heat pump?

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.

Specifications

5-1-1 Day Programmable Thermostat

Thermostat TypeProgrammable
ColorWhite
Program Modes5-1-1 Programmable
Utility RewardsNo
Display TypeLCD Screen
Warranty1.5 Years
Control FunctionsHeating, Cooling
Alerts and RemindersFilter Change 1, Battery Replacement, Memory Error, Unknown Time, Internal Sensor Failure

Downloads

Quick Installation Guide [pdf]: RTH7400, RTH7500 Series Programmable Thermostat

Quick Installation Guide [pdf]: RTH7400 and RTH7500 Series Programmable Thermostat

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