Any time you wish to turn your system off, simply move the SYSTEM switch to OFF. This will not affect your thermostat's programming in any way. To turn the system back on, move the SYSTEM switch to HEAT or COOL and press RUN PROG. The system will begin operating according to the current thermostat program, unless the thermostat is in the HOLD mode. See OPERATING YOUR THERMOSTAT in your Operating Guide.

Unless the thermostat appears to be damaged it will follow the program that is in the memory. The most common reason a thermostat will appear not to be following the program is a programming error. Verify that the AM or PM settings are correct for each period. Also verify that the Day of the week is set correctly. Models with EMR (Energy Management Recovery) start early to make the temperature they are programmed for by the time specified in the program. See your thermostat Operating Instructions or check this link for procedure to see if your thermostat has EMR and how to disable EMR if you do not want the thermostat to start early.

There is no need to select a time to stop a programming period. Starting a new programming period will stop the previous program period.

1F8X-XX Series Multi-stage and Heat Pump thermostats are designed to determine the optimum time to activate the second stage. Simply raising the temperature in heating or lowering it in cooling will not always force the thermostat to bring the second stage on quickly. There is a time delay from 0-25 minutes. The time element (0-25 minutes) of the delay varies depending on the performance of the first stage. In Heating for example, assume for the last 2 hours the thermostat is set on 70 and the room temperature is 70 with the equipment using only the first stage of heat. The thermostat calculates (internally) the performance of the system. Since the equipment is keeping the temperature within 1 degree of set point the thermostat will delay second stage for a longer time if you manually raise the temperature or if the room temperature quickly changes. Once the second stage comes on it will come on sooner the next time there is a difference between the set point and the room temperature. The net effect of the staging program is when the first stage is capable of making temperature the second stage will delay longer. When the thermostat calculates first stage cannot make temperature in a reasonable time the second stage will come on sooner. This is a built in function that automatically optimizes the use of additional stages of heat or cool. Most thermostat models have a method to bring the additional heat or cool stages on quickly for testing purposes listed in the installation instructions under the heading of “Testing Your Heat/Cool System".

AUX - Auxiliary Heat or the second stage of heat in the Heat mode. This is energized when the Heat Pump is not keeping up with the thermostat setting. It is normal operation with most pumps for the thermostat to call for auxiliary heat. If the auxiliary heat and emergency heat are using the same back-up heat source the thermostat may also show the Emergency Heat light whenever the Auxiliary heat is on.

EMER - Emergency Heat. When switched to Emergency the thermostat bypasses the pump and uses the back-up heat. This is useful if the pump is not operating correctly or if the temperature outside is so cold that the pump is not economical to run. If the Auxiliary Heat and Emergency Heat are using the same back-up heat source the thermostat may show the Auxiliary and Emergency Heat light on at the same time.

MALF - Malfunction. Malfunction indicates the heat pump system is sending a signal to the Malfunction Indicator on the thermostat terminal marked “L”. It does not indicate a malfunction in the thermostat. The manufacturer of the Heat Pump system can determine the likely cause of malfunction indication on the thermostat.

Adjustable Heating Cycle Times (also called Anticipation). Cooling is not adjustable.

Your thermostat is designed to cycle on and off in heating or cooling, keeping your building in an accurate temperature range. This maximizes your comfort by keeping the room temperature very close to the temperature you set. It is not unusual for your thermostat to be set for 70 and cycle on and off at 70 keeping you right on target.

Most 1F80 Series thermostats have a feature that allows you to increase or decrease the cycle times in heating. This is useful if you think your cycle times are too long or too short. 

A note on older style thermostats; Anticipation on older style thermostats (mercury bulb or mechanical) used the current draw of the equipment to set the anticipation. Some heating and cooling equipment manufacturers still refer to setting the anticipator to the current draw of the equipment. This does not apply to your new digital thermostat. Right from the box your new thermostat will do an excellent job of keeping your building at an accurate temperature. The information above allows you to customize the performance of your digital thermostat to your requirements.

See your thermostat Operating Instructions or check this link for procedure to adjust the cycle time (anticipation).

On Single-Stage models, heating can be set to A or H. Cooling is not adjustable. On Multi-Stage or Heat Pump models, heating can be set to F or S.

The chart below shows how this adjustment range affects thermostat performance.

† These numbers are approximate and represent operation with a typical system. Actual temperature differentials and run times will vary based on your building and equipment, as well as outdoor temperature conditions.

To bypass the program (on programmable models) and operate the thermostat manually (like a mechanical model) move the SYSTEM switch to Heat or Cool (whichever your prefer) and press HOLD. Use the Temp Up or Temp Down buttons to set the thermostat on the temperature you want. The temperature setting you choose will be held until you manually change it using the Temp Up or Temp Down buttons. The thermostat will remain in the HOLD mode when you change temperature and maintain whatever temperature you set. If you decide to return to the program press PROGRAM RUN to cancel the hold feature.

On 1F80-XX models with batteries, we recommend replacing the batteries once a year.

The temperature display on a digital thermostat will normally read very accurately. If however, the heating and/or cooling system is oversized or undersized or the location of the thermostat is not ideal it can cause the temperature display for the room to read high or low.

See your thermostat Operating Instructions or check this link for procedure to adjust the temperature display.

Your thermostat display can be set to display temperature in Fahrenheit or Celsius. See your thermostat Operating Instructions or check this link for procedure to change your display between °F and °C.

No Heat:
With the system set to heat, when the set point temperature is raised or lowered past the room temperature, the thermostat will make a soft click sound within about 5 seconds. Usually the sound indicates correct thermostat operation. If the heat does not come on after raising the temperature and hearing the click, check the fuses or breakers, make sure the furnace is switched on, and verify the blower compartment door is closed properly. If no click sound is heard try resetting the thermostat as described below. If the no heat or no cool condition persists after resetting the thermostat, you may wish to contact your heating/cooling service person for assistance.

No Cool:
Air conditioning systems usually include an outdoor compressor and an indoor blower. With the thermostat set to COOL and the temperature lowered below the room temperature by a couple of degrees there can be up to a five minute delay before the thermostat activates the compressor and an indoor blower. If both the compressor and an indoor blower are running and the air is not cool it may indicate loss of refrigerant in the compressor. If the blower or compressor do not come on or do not shut off try  resetting the thermostat as described below. If the no heat or no cool condition persists after resetting the thermostat, you may wish to contact your heating/cooling service person for assistance.

Reset Operation:
Check this link for procedure to reset your thermostat.

Operating Manuals for most 1F80 Series thermostats are available on-line in pdf format. You must have Adobe Reader loaded to view the manuals.