Answer: Honeywell thermostats have a model number that begins with a TH, T, RTH, CT, TL or RLV. The location of the model number varies depending upon the thermostat. If the thermostat is battery operated and the batteries are accessed from the front of the thermostat, please check the area around the batteries. If the batteries are on the back of the thermostat or if the thermostat is not battery operated, the model number should be on the back of the thermostat once the thermostat is removed from its base. If your thermostat has a mechanical clock, the model number is on a sticker on the horizontal surface above the clock.

Answer: 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.

Answer: 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.

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

Answer: Your thermostat is designed to control temperature to +/- 1 F. How often your heat turns on and off depends on may factors including the type of heating system you have, as well as how much your system needs to run to maintain your temperature setting (in other words, how cool or cold it is outside). A typical forced air system will cycle about five times in an hour (5CPH), this is normal. A typical hot water system would cycle less then that

Answer: 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.

Answer: "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.

Answer: 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.

Answer: A heat pump is a single system that provides both heating and cooling to the home. For example, the air conditioner may prove both heating and cooling to the home - this is called a heat pump. 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.

Answer: 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.

Answer: Honeywell digital thermostats are designed to display the room temperature in a way similar to how people sense temperature. This means the thermostat takes into account not just the ambient air temperature but also the radiant temperature of objects in the room (i.e., wall and furniture). Room thermometers often only read ambient air temperature so they will not match the thermostat reading. Also, Honeywell thermostats do round in the display to the nearest whole number (half number in Celsius) and to the temperature setting. For example, if you have the thermostat set to 72 degrees the system will turn on and off but the inside reading on the thermostat never changes from 72. The actual temperature did fall to 71 or up to 73 and that is what turned on the heating or cooling but the thermostat display will stay at 70 to avoid jumping up and down constantly.

Answer: 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.

Answer: 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.

Answer: 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.

Answer: 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.