FAQ Question for Honeywell Thermostat Model CT3200
- What is
cycle rate (System On-Time Setting)?
system type will deliver heat to the house at a slightly different rate. The
CT3200 provides you with the flexibility to set the cycle rate adjustment to
match your specific heating system, whether it is gas or oil forced air,
high efficiency forced air, electric forced air, or baseboard hot water.
- How do I
set the cycle rate (System On-Time Setting)?
Remove the thermostat from the wallplate. Pull the lower right corner of the
thermostat toward you until it detaches from the wallplate.
Step #2: Following the directions on the back of the thermostat or in the
table below, adjust the A and B screws to match your system type.
Step #3: Replace thermostat on the wallplate by lining up the top of the
thermostat with the top of the wallplate, and then pushing the thermostat
onto the wallplate until it snaps on.
|Warm Air Furnace
||A - in
||B - in
|90 plus High Efficiency Furnace
||A - out 1 turn
||B - in
|Hot Water Boiler
||A - out 1 turn
||B - in
||A - in
||B - out 1 turn
- Which kind
of batteries does the CT3200 require?
uses two AA alkaline batteries.
- Where are
the batteries located?
The two AA
alkaline batteries are located under the battery cover on the left side of
the thermostat. The cover is easily removed by pulling from the bottom of
the battery cover. There is also a small opening at the bottom of the
battery cover if you need to use a coin to release the cover.
- How often
should the batteries be replaced?
thermostat has a low battery indicator, replace the batteries once a year to
prevent the thermostat and heating/cooling system from shutting down due to
a lack of battery power. The optimum schedule would be to replace the
batteries every fall before the heating season.
- Is there a
low battery warning?
thermostat's display will read "bAt Lo" 1 to 2 months before the
batteries run out completely. Replace the batteries as soon as possible
after this indication appears in the display.
- What does
bAt Lo mean in my display?
batteries are running low, a "bAt Lo" indicator will flash for 1
to 2 months before batteries run out completely. Replace the batteries as
soon as possible after the indicator starts flashing. After the batteries
are completely dead, the "bAt Lo" indicator will disappear,
leaving a completely blank display. The thermostat will not operate the
heating or cooling system until new batteries are installed.
- It says bAt
Lo in my display, what can I do to clear this?
replace the batteries with a new set of AA alkaline batteries. If you insert
the new batteries within 20 to 30 seconds of removing the old ones, you will
not have to reprogram the thermostat. If the bAt Lo indication does not
clear itself once new batteries are placed in the device install the
batteries backward for 5 seconds, take them out, and reinstall correctly.
Eventually 1:00pm should come up and you can reprogram the thermostat.
You may also
want to clean the terminals with electrical contact cleaner and a soft
cloth. Do not use a sharp object like a screwdriver or knife to clean
terminals as this may cause permanent damage to the coating on the
If neither of
these options clear the bAt Lo indicator, the thermostat should be replaced.
- Will the
thermostat operate without batteries?
thermostat requires two AA alkaline batteries to operate.
happens when the batteries go dead?
thermostat will provide a 1 to 2 month warning (display will show "bAt
Lo") before the batteries go dead. Once the batteries go completely
dead, the display will be blank and the thermostat will not operate the
heating and/or cooling system. Replacing the batteries once a year should
prevent the heating/cooling system from shutting down due to lack of battery
- What is the
purpose of the fan operation switch?
thermostat fan operation switch, labeled FUEL SWITCH in the diagram below,
is factory-set in the "F" position. This is the correct setting
for most systems. If your system is an electric heat system, set the switch
to "E". The "E" setting will allow the fan to turn on
immediately with the heating or cooling in a system where the G terminal is
On some electric furnaces, the furnace itself controls the fan. In this
case, the switch can be left in the F position. Consult your furnace
manufacturer or contractor to determine the fan operation if you are unsure.
- Why is my
thermostat cycling so often?
digital thermostats are designed to maintain temperature within 1°F of the
setpoint. In heating, the thermostat is factory set for forced air systems.
This means lighter heating or cooling loads will change the cycling of your
thermostat to shorter on and off times, which is normal for forced air
systems. To ensure your thermostat cycle rate is matched to your system
type, see "How do I set the cycle rate?"
- Why did my
displayed temperature drop about 50 degrees (slipping into Celsius reading)?
There is a
temperature conversion screw marked "C" on the back of some
thermostats. When it is in tight, the thermostat will display temperature in
degrees Fahrenheit. When the screw is turned out (lose), the display reads
Celsius. Simply backing the screw out, re-tightening, and pressing the RUN
PROGRAM key should put your thermostat back into the Fahrenheit mode.
- Why does
this thermostat show a different temperature than another room
temperature sensorand radiant heat, an accurate electronic sensor, measures
air temperature. The air temperature is affected by the wall temperature and
objects in the room which are radiating heat. Its displayed temperature may
therefore be different than another thermostat or thermometer. Air movement
from behind the wall may also affect the temperature reading on the
thermostat. Plugging the opening in the wall behind the thermostat may
lessen the changes in temperature due to this type of air movement.
- Why does
the display temperature begin to climb when the cooling system is
displayed temperature climbs when the cooling system is running and it is
clear that the house is becoming cooler, this may be the result of high
current, causing the inside of the thermostat to heat up. Have your system
checked by a local contractor.
- Why does my
thermostat does not have the capability of making an audible noise such as a
beeping. The noise you are hearing is likely from another electronic device
which is near the thermostat. Check for a smoke detector or security system.
- What do I
do if my LCD display breaks?
There are no
replacement LCD displays available. If the LCD display breaks on your
thermostat, then the thermostat will need to be replaced.
- Why is
there a delay on my Air Conditioning coming on?
thermostat has a built-in five-minute delay on a request for air
conditioning. This is for the purpose of protecting your air conditioning
compressor from short cycling. This allows the pressure in your air
conditioning compressor time to stabilize before starting. If your air
conditioning has a built-in time delay as well, the two delays will run
- Why does my
thermostat turn off before it reaches my set temperature?
In order to
prevent overshooting your programmed temperature, the CT3200 is designed to
shut the system off (in both heating and cooling) before reaching the set
point. Shortly thereafter, it will bring the system back on, bringing the
room temperature to your programmed temperature. This is considered normal
operation. On rare occasions (e.g. very hot afternoons), the thermostat may
cycle the system on and off more than once prior to reaching your programmed
- Why doesn't
my heat and cooling switch between the two automatically?
called auto changeover is not available on this model of thermostat. This
feature allows the heating or cooling equipment to be turned on based on the
room temperature demand. This feature is used in climates that would require
the heating and cooling equipment to be on in the same day. Say in a dessert
or mountain area where you may have cool morning temperatures (that required
the heat to run) and hot afternoon temperatures (that require the cooling to
run). Models with this feature, like the Chronotherm IV, are available
through heating and cooling contractors.
- Why do the
temperatures appear different than a thermometer I have placed by the
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 reflective
temp of objects in the room (i.e., wall and furniture). The thermostat uses
two sensing elements to sense and display room temperature. One measures the
ambient air temperature while the other measures radiant heat. These two
readings are then taken together to give the displayed temperature. The
thermostat also rounds the displayed temperature to the current temperature
set point. For example, if the thermostat is set for 70 degrees, the
displayed temperature will show 70 degrees even if actual room temperature
is 69.4 degrees Fahrenheit.
- It mentions
in my owner's manual about needing a relay if my existing thermostat used 3
wires. Who do I contact, and what is this for?
installation of a relay is for certain types of three wire, heating only
applications. If you have a three wire, heating only application, we
recommend talking with a contractor to determine if you will need a relay in
order to use this thermostat.
- How do I
switch the thermostat from reading in Fahrenheit to Celsius, and vice
On the back
of the thermostat, there is a screw labeled C. To display the temperature in
Fahrenheit, adjust the screw in. To display the temperature in Celsius,
adjust the screw out one turn.
- I see an
arrow pointing towards System On, but there is no heat coming up. What
should I do?
the thermostat makes a call for heat, it will indicate this an arrow
pointing towards System On in the display. This means that the thermostat is
trying to get the heating system on, but for some reason, the heating system
is not responding to that call for heat. You can try to place the thermostat
switch in the Off Position for 5 minutes and try again. It is recommended to
call your heating and cooling contractor to have your system checked for
thermostat misses the program it is set for during the day. This happens a
few days during the week, but the other days seem to be fine. What is
causing this problem?
thermostat has four program periods for the weekdays, and two for the
weekends. This means that all program periods must be set for the exact time
and temperature you want the thermostat to maintain during these time
periods. It is recommended to recheck your programming, and verify all the
times are in chronological order.