Start-up
The LCD will show the factory default
display of 70°F (21°C) when
batteries are first installed, or after
the Reset button is pressed. The
temperature will update after a few
seconds.
System Selector Switch
The System Selector switch on the front of the thermostat determines the
operating mode of the thermostat. You may select COOL, OFF, HEAT. NOTE:
Anytime you install or remove the thermostat from the wallplate, slide
the System Selector to the OFF position to prevent the possibility of
a rapid system On-Off.
Fan Switch
The Fan switch should normally be located in the AUTO position. The Fan
will be turned on along with normal operation of your system. In a normal
gas or oil furnace, the Fan will be turned on by your furnace after its
warm-up delay. For electric heat and air conditioning operation, the Fan
will turn on with the system. To run the Fan on continuously, slide the
Fan switch to the ON position.
Review Current Set Temperature
Press either the up or down key for less than 1 second to see the
Set Temperature. The factory default is 68°F (20°C) when started
with the System Switch Off or Heat, and 78° (26°C) when started
with the System Switch on Cool.
Setting New Temperature
• Press either the up or down key and hold for longer than 1 second.
• The display will flash to show that you are in Set Temperature
mode, then you can release the key.
• Press either up or down again to change to your desired Set Temperature.
Hold the key down for over 2 seconds to fast-advance the Set Temperature.
The display will return to the normal room temperature after the keys
have been released for 3 seconds.
Filter Monitor
The Model 42999 thermostat counts the number of hours your system’s
filter has been in use. To maximize your system’s performance and
energy efficiency, change or clean your filter regularly.
When the total system run time for heat and cool reaches 400 hours, the
Filter Change Indicator will flash as a reminder to check your system’s
filter.
After changing or cleaning the system filter, press and hold the Filter
key for 3 seconds. The display will blink, and the counter will be reset
to zero.
Note: Pressing the Filter key at any time for less than 3 seconds will
cause the Filter Change Indicator to appear on the LCD. This is only to
confirm key operation, and the counter is not affected unless the key
is held for greater than 3 seconds.
SPAN Setting
Your thermostat is set at the factory to cycle at 1°F (0.5°C)
above and below the set temperature. (Span = 2) This setting on your 42999
hunter thermostat has been designed to provide a comfortable room temperature
under most all conditions. However, if you find your system cycling too
fast or too slow, then the Span can be adjusted to modify the cycle time.
• Press and hold BOTH for three seconds. The display will flash,
and SPAN will be displayed on the LCD.
• Press to raise the Span to 3. This setting INCREASES the cycle
time by allowing your system to run LONGER.
• Press to lower the Span to 1. This setting DECREASES the cycle
time by causing your system to run SHORTER. The Span settings remain the
same for both HEAT and COOL, and can be changed in any System Switch position.
When batteries are installed in the thermostat, or the Reset key is pressed,
the Span is reset back to setting 2.
Low Battery Warning
Your thermostat has a two-stage low battery warning system. When the batteries
are first detected to be weak, the first stage low battery warning is
indicated by battery symbol flashing on the LCD display. At your earliest
convenience, you need to replace the batteries with 2 new AA alkaline
batteries.
When the batteries become too weak for normal operation, the thermostat
enters the second stage low battery warning which shuts down the thermostat.
In this condition, “BATT” flashes alone on the display, and
the thermostat will turn your system Off. Your system will remain shut-off
until the batteries are replaced.
Note: Your hunter digital thermostat model 42999 will still keep the current
Set Temperature and Filter run time in memory until new batteries are
installed. After confirming that new batteries have been inserted, the
thermostat will return to normal operation.
Error Mode
If the thermostat is unable to control your system due to an unexpected
battery problem, the thermostat will enter Error Mode. In this condition,
the thermostat flashes “Er” on the LCD display, and shuts
off your system.
To correct this problem, replace the batteries in your hunter thermostat
with 2 new AA alkaline batteries, even if you have recently replaced them.
Next, use a paper clip to press the RESET button next to the keypad. You
will need to reprogram your thermostat and confirm normal operation.
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