In case of difficulty................................ 9
Customer assistance.......................... 10
2-year limited warranty........................11
PRO 1000 Series
About your new thermostat
Your new Honeywell thermostat has been designed to give you many years of
reliable service and easy-to-use, push-button climate control.
Features
•Backlit display is easy to read
•Displays ambient (measured) temperature at all times
•One-touch access to setpoint temperature
•Built-in compressor protection
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Operating Manual
Quick reference to controls
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Press to adjust temperature
Screen
Lit for 12 seconds when you press any button.
Fan Switch (see page 5)
•On: Fan runs continuously.
•Auto: Fan runs only when
heating or cooling is taking place.
System switch (see page 4)
•Cool: System is in Cooling mode.
•Off: System is off.
•Heat: System is in Heating mode.
•Em Heat: System is in Emergency Heat mode.
2
Quick reference to display
Setpoint indicator
Appears when the setpoint
temperature is displayed.
Low-battery warning
(see page 8)
System Status
• Cool On: Cooling is activated. *
• Heat On: Heating is activated. *
• Aux On: Auxiliary heat is activated. **
* If Heat On or Cool On is flashing, compressor protection is engaged (see page 7).
** Applies to TH1210D model only .
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Temperature display
The ambient (measured)
temperature is normally
displayed. To view the
setpoint temperature, press
either of the temperature
adjustment buttons once.
The setpoint temperature
will appear for five seconds.
PRO 1000 Series
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Operating Manual
System switch
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Use the System switch to place the system in one of the following
modes.
• Cool: System is in Cooling mode. (This mode is not available on
the TH1100D model.)
• Off: System is off.
• Heat: System is in Heating mode.
• Em Heat: System is in Emergency Heat mode. Only auxiliary
heating can be activated. The compressor is disabled. (This
mode is available on the TH1210D model only.)
CAUTION: EQUIPMENT DAMAGE HAZARD
Do not use Cooling mode when the outdoor temperature is below 50 °F (10 °C).
4
Fan switch (select models)
PRO 1000 Series
Use the Fan switch to select the fan operation.
• Auto: The fan runs only when heating or cooling is actually
taking place (commonly used setting).
• On: The fan runs continuously.
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Operating Manual
Temperature controls
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Press the or button
once to display the setpoint
temperature. Press either
button more than once to
change the setpoint.
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PRO 1000 Series
Built-in compressor protection (select models)
Your thermostat has a feature that helps prevent damage to the compressor of
your air conditioning or heat pump system. Because damage can occur if the
compressor is restarted too soon after shutdown, this feature forces the
compressor to wait 5 minutes before restarting. During the wait time, the message
Cool On or Heat On flashes on the screen. When the safe wait time has elapsed,
the message stops flashing and the compressor turns on.
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Operating Manual
Battery replacement
NOTE: Batteries are optional (and serve as backup power) only if your
thermostat is connected to 24 VAC.
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Install two fresh AAA batteries when Lo Batt (low batteries) flashes on
the screen. The message appear s for 60 days be fore the batt eries are
depleted.
Replace batteries once a year, or when you will be away for more than
a month.
The settings are stored in non- volatile (permanent) memory and are
thus preserved when the thermostat is without AC power or batteries.
NOTE: The low-battery icon will not appear when the batteries are depleted
if the thermostat is connected to 24 VAC.
Set the System switch to Off before removing the batteries.
Otherwise, the heating/cooling system could remain activated
even when batteries are removed.
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PRO 1000 Series
In case of difficulty
Screen is blank.• Check circuit breaker and reset if necessary.
Temperature settings cannot be
changed.
Cool On or Heat On is flashing.• The compressor protection delay has been activated. Wait for the
HI appears on the screen.• The ambient (measured) temperature is above 122 °F (50 °C).
LO appears on the screen.• The ambient (measured) temperature is below 32 °F (0 °C).
E1 appears on the screen.• The temperature sensor circuit is opened. Replace the thermostat.
E2 appears on the screen.• The temperature sensor circuit is shorted. Replace the thermost at.
• Ensure the heating/cooling system is powered up.
• Ensure the furnace door is properly closed.
• Ensure two fresh AAA alkaline batteries are correctly installed.
•The System switch is off.
• You are setting the temperatures out side their allowable ranges:
• Heat: 40 °F to 90 °F (4.5 °C to 32 °C).
• Cool: 50 °F to 99 °F (10 °C to 37 °C).
delay to end (maximum of 5 minutes).
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Operating Manual
Customer assistance
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For assistance with this product, please visit
http://yourhome.honeywell.com.
Or call Honeywell Customer Care toll-free at
1-800-468-1502.
To save time, please note your model number and
date code before calling.
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