Listed below are links to installation/operating instructions for 80 Series Digital thermostats.

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.

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.

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.

For Single Stage models there are 3 possibilities to consider (excluding tampering):

Loss of power from the system and back-up batteries not functioning.
You may want to see if the thermostat maintains the display when removed from the subbase to
determine if the batteries are functioning on power loss. You may want to check the fuses or breakers, the on/off switch on the furnace and the door to the blower compartment. If the blower compartment door is loose there may be a switch inside the door that disconnects power to your system. Also consult the furnace manufacturer to see if they have any other ideas on what could drop out the system power.

Static electricity or a voltage spike from the heating equipment might be resetting the thermostat. Static electricity can be eliminated by touching something before touching the thermostat to dissipate the static charge. A voltage spike from the equipment can be eliminated using an isolation relay as described in the link below.

http://www.white-rodgers.com/pdfs/instruction_sheets/0037_5426_A.pdf

You can also check the wire routing to verify the thermostat or remote wires are not running parallel to High voltage lines with high inductive loads that could (in extreme cases) create a voltage spike at the thermostat.

For Multi-Stage or Heat Pump staging models there are other possibilities to consider and they are as follows:

Loss of power from the system. You may want to check the fuses or breakers, the on/off switch on the furnace and the door to the blower compartment. If the blower compartment door is loose there may be a switch inside the door that disconnects power to your system. Also consult the furnace manufacturer to see if they have any other ideas on what could drop out the system power.

Static electricity can be eliminated by touching something before touching the thermostat to dissipate the static charge.

A voltage spike from the heating equipment might be resetting the thermostat and if you have a system that generates a high voltage spark (D.S.I.) you may want to contact the Equipment manufacturer for information on how to eliminate that condition. You can check the wire routing to verify the thermostat or remote wires are not running parallel to high voltage lines with high inductive loads that could (in extreme cases) create a voltage spike at the thermostat.

In cooling, as the room temperature falls you will eventually reach the setpoint temperature. The system will continue to run until it reaches the low side of the temperature setting. As an example: If set to 78° with the room temperature falling the thermostat will continue to call for cool as the temperature decreases in the following manner. 78.9 °, 78.8 °, 78.7 °, 78.6 °, 78.5 °, 78.4 °, 78.3 °, 78.2 °. At approximately 78.2 ° the thermostat will quit calling for cool. This is why it is not unusual for the room temperature and set temperature to read the same but the system continues to run. The amount of time it takes for the system to shut off is dependent on system sizing, thermostat location, etc. Note: The thermostat display only displays whole numbers. Internally the thermostat calculates decimals. In heating as the room temperature increases the system will continue to run until the thermostat reaches the high side of the temperature setpoint.

The L icon means that you either have your HEAT/COOL or both limited ranges set. The L icon flashes to indicate the Limit was trying to be exceeded.

When the thermostat compressor time delay occurs it will flash the setpoint for about five minutes. This is intended to help protect the compressor from short cycling.

On the front page of your instructions under SPECIFICATIONS (APPLICATIONS) there is a listing of compatible systems that this thermostat can be used on.

The Snowflake icon is displayed (flashing) if the thermostat is in lockout mode to prevent the compressor from cycling too quickly. The Flame and Snowflake icons flashing simultaneously on the 1F82-261 & 1F89-211 models indicate a Compressor Lockout. Also the Flame icon flashing on its own in the heat mode for both models indicates that Auxiliary Heat is energized.

If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation you can reset the thermostat. See Reset Operation in "My Heating or Cooling does not work. What can I do?" above.

No. This thermostat has permanent memory, although you will have to reset your clock.

The display light in the 1F80 series is not a replaceable item. On single stage thermostats (1-heat/1-cool) the light uses battery power. If the light is not coming on, replace the batteries and/or clean the battery contacts inside the back of the thermostat. Use a pencil eraser to gently polish each of the battery contacts. Do not bend them up and down or they may break. When complete they should be as shiny as a mirror. This will assure proper battery back-up and allow the backlight to work correctly. The multi-stage and heat pump models obtain power for the light from the 24 volt transformer so if anything in the system interrupts power to the thermostat the light will not operate.

Possible short in wiring, Check each wire connection to verify they are not shorted or touching together. Possible short in thermostat, no bare wire should stick out from under terminal screws. Fan Switch slid to Fan On, or FAN button pushed to display FAN ON. If the condition persists, the manufacturer of your system or service person can instruct you on how to test the Heat/Cool system for correct operation. If the system operates correctly, replace the thermostat.

Any time you wish to turn your system off, simply slide the SYSTEM switch to the OFF position or push the SYSTEM button until OFF is displayed. This will not affect your thermostat's programming in any way.

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 it's program is a program 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 the Configuration Menu of your thermostat Operating Instructions for information on 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-XXX 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 0-30 minutes. The time element (0-30 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 setpoint 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 setpoint 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".

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. Your 80 Series thermostats have an option that allows you to select a fast or slow heating cycle rate. 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.

The thermostat can hold any temperature within it's range for an indefinite period without reverting to the programmed temperature. Momentarily press the HOLD button. HOLD will be displayed. Then choose the desired temperature by pressing the Temperature Up or Temperature Down arrow. The thermostat will hold the room temperature at the selected setting until you press the RUN button to start program operation again.

For optimum performance we recommend that you replace the batteries once a year with "AA" Alkaline batteries.

Yes. The thermometer can be adjusted +/- 4 degrees as listed in the Installation/Configuration Menu.

Your thermostat display can be set to display temperature in Fahrenheit or Celsius. Refer to your instructions under Installation/Configuration Menu.

No Heat: With the system set to heat, when the setpoint 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, verify the blower compartment door is closed properly and if your furnace has a pilot verify that the pilot is lit. 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. 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:
1F80-224= Press Temperature Up, Temperature Down, and TIME simultaneously.
1F80-240= Press Temperature Up, Temperature Down, and TIME simultaneously.
1F80-241= Press Temperature Up, Temperature Down, and TIME simultaneously.
1F80-261= Press Temperature Up, Temperature Down, and TIME simultaneously.
1F80-361= Press Temperature Up, Temperature Down, and TIME simultaneously.
1F81-261= Press Temperature Up, Temperature Down, and TIME simultaneously.
1F82-261= Press Temperature Up, Temperature Down, and TIME simultaneously.
1F83-261= Press and hold Temperature Up and Temperature Down, and move the SYSTEM switch from OFF to HEAT.
1F83-277= Press the SYSTEM button until OFF is displayed, then press UP, DOWN and the SYSTEM
button at the same time.
1F85-275= Press the SYSTEM button until OFF is displayed, then press UP, DOWN and the SYSTEM
button at the same time.
1F85-277= Press the SYSTEM button until OFF is displayed, then press UP, DOWN and the SYSTEM
button at the same time.
1F86-241= Press and hold Temperature Up and Temperature Down, and move the SYSTEM switch from OFF to HEAT.
1F86-244= Press and hold Temperature Up and Temperature Down, and move the SYSTEM switch from OFF to HEAT.
1F87-251= Press Temperature Up, Temperature Down, and TIME simultaneously.
1F87-361= Press Temperature Up, Temperature Down, and TIME simultaneously.
1F89-211= Press and hold Temperature Up and Temperature Down, and move the SYSTEM switch from OFF to HEAT.