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White Rodgers M100 - User Manual

White Rodgers M100
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CONTENTS
Preparations ...........................................
Thermostat Features ..............................
Removing Old Thermostat ......................
Mounting and Wiring ...............................
Set Heat Anticipator ................................
New Thermostat Operation .....................
Specifications .........................................
Troubleshooting ......................................
2
THERMOSTAT FEATURES
1
PREPARATIONS
Before removing wires from old thermostat’s switching subbase,
label each wire with the terminal designation it was removed
from. Some models also include an adaptor plate to cover
unpainted surfaces. Thermostat wires pass through the adaptor
plate center opening.
1. Remove Old Thermostat: A standard heat/cool thermostat
consists of three basic parts:
a. The cover, which may be either a snap-on or hinge type.
b. The base, which is removed by loosening all captive screws.
c. The switching subbase, which is removed by unscrewing the
mounting screws that hold it on the wall or adaptor plate.
Make a note here of the anticipator setting on
the old thermostat for future reference and use in step 5.
The heat anticipator pointer, if adjustable, will be set at one of a
series of numbers representing the current rating of the primary
control in your furnace. The number will be one of the following:
.2, .4, .8, etc. or 0.2, 0.4, 0.8, etc.
If no heat anticipator/indication is showing, do not be concerned;
move on to the next step.
PART NO. 37-7268A
1137
Failure to follow and read all instructions carefully before
installing or operating this control could cause personal
injury and/or property damage
Assemble tools required as shown below.
WIRE CUTTER/STRIPPER
SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—
THERMOSTAT MUST BE LEVEL TO WORK PROPERLY
FLAT BLADE SCREWDRIVER
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
To prevent electrical shock and/or equipment damage,
disconnect electrical power to the system at the main fuse
or circuit breaker until installation is complete.
CAUTION
!
1
2
3
4
5
6
7
8
Installation Instructions for
Model M100
SUBBASE
(MODEL 300
ONLY)
BASE
COVER
ANTICIPATOR
CAPTIVE SCREWS
MOUNTING SCREWS
Figure 1.
Adaptor Plate
(optional)
YOUR THERMOSTAT REPLACES
Description
Standard Heating & Cooling Systems- 4 or 5 wires Yes
Standard Heat Only System Yes
Millivolt Heat Only Systems- Floor or Wall Furnaces Yes
Standard Central Air Conditioning Yes
Gas or Oil Heat Yes
Electric Furnace Yes
Hydronic (Hot Water) Zone Heat - 2 Wires Yes
Hydronic (Hot Water) Zone Heat - 3 Wires No
Heat Pump (No Aux or Emergency Heat) No
Heat Pump (with Aux or Emergency Heat) No
Baseboard Electric Heating or Line Voltage (120 or 240 Volt) No
3
REMOVING OLD THERMOSTAT
www.white-rodgers.com

Questions and Answers

  • J
    Jose GrayAug 15, 2025
    What to do if my White Rodgers Thermostat is not cooling?
    • A
      adavisAug 15, 2025
      If your White Rodgers Thermostat isn't cooling, first, check that the thermostat and system wires are securely attached. If the wiring is secure, and the cooling system is known to be working correctly, but the problem persists, the thermostat may need to be replaced. Also, ensure the System Switch is set to Cool and the temperature is set lower than the room temperature.
  • T
    Thomas HunterAug 19, 2025
    Why is my White Rodgers Thermostat not heating?
    • M
      Meagan CruzAug 19, 2025
      If your White Rodgers Thermostat is not providing heat, try these steps: 1. Re-light the pilot light, if applicable. 2. Verify that the thermostat and system wires are securely attached. 3. Set the System Switch to Heat and raise the temperature above room temperature. If the issue continues, have a qualified service person check the system before replacing the thermostat. A broken or melted anticipator wire, or a loose connection could also be the cause.
  • K
    Kelli ColemanAug 22, 2025
    How to troubleshoot no heat, no cool, or no fan on a White Rodgers Thermostat?
    • Z
      zacharyrodgersAug 22, 2025
      If your White Rodgers Thermostat is not providing heat, cool, or fan function, check the following: First, replace any blown fuses or reset tripped circuit breakers. Second, ensure the furnace power switch is set to ON. Finally, make sure the furnace blower compartment door or panel is correctly installed to engage the safety interlock or door switch.
  • J
    James BurchAug 25, 2025
    What to do if my White Rodgers M100 heat, cool, or fan runs constantly?
    • J
      Jennifer GrayAug 26, 2025
      If your White Rodgers Thermostat is constantly running heat, cool, or fan, inspect the wiring connections at the thermostat. Ensure each wire is neatly looped under the terminals with no extra wire sticking out. A short in the wiring, thermostat, or the heat/cool/fan system could be the cause.
  • K
    Keith BryanAug 28, 2025
    Why is my White Rodgers M100 cooling cycle too fast or slow?
    • C
      Christina HicksAug 29, 2025
      The cooling cycle rate for a White Rodgers Thermostat cannot be adjusted. However, the thermostat's location, the size of the cooling system, and the current draw can influence the cycle rate. Consider contacting a local service person for further assistance.
  • E
    emilycampbellSep 1, 2025
    Why is my White Rodgers M100 heat intermittent?
    • M
      maryharrisSep 1, 2025
      Many furnaces have safety devices that shut the system down when a lock-out condition occurs. If the heat works intermittently contact the furnace manufacturer or local service person for assistance.
  • M
    Michaela RobertsonSep 4, 2025
    How to adjust the heating cycle rate on a White Rodgers M100?
    • D
      drakematthewSep 4, 2025
      The anticipation setting is the only adjustment that effects the heating cycle rate. If an acceptable cycle rate is not achieved using the anticipator contact a local service person for additional suggestions. The location of the thermostat, size of the Heat/Cool System and current draw can influence the cycle rate.
  • K
    karlawrightSep 7, 2025
    How to adjust the thermometer on a White Rodgers Thermostat?
    • S
      smithcatherineSep 7, 2025
      The thermometer on the White Rodgers Thermostat is accurately calibrated at our factory but you can adjusted it by using a standard slotted screwdriver. Turn the thermometer pointer screw located inside the front cover to change the setting.
  • T
    Tyler GreerSep 12, 2025
    What to do if my White Rodgers M100 Thermostat setting and thermometer disagree?
    • K
      krystal79Sep 12, 2025
      You can adjust the thermometer on your White Rodgers Thermostat using a standard slotted screwdriver. Locate the thermometer pointer screw inside the front cover and turn it to change the setting. If you need to calibrate the setting lever, contact a local heating and cooling service person.

Summary

Preparations

Thermostat Features

Removing Old Thermostat

Electrical Safety Caution

Warning to disconnect power to prevent electrical shock or equipment damage during installation.

Mounting and Wiring

Remove Base from Subbase

Loosen screws on the base and remove it from the subbase.

Mount Switching Subbase;Adaptor Plate

Mount the subbase and adaptor plate to the wall using provided screws.

Attach Wires to Terminals

Connect system wires to the appropriate thermostat terminals based on system type.

Mount Thermostat Base

Push wires back into the wall and mount the thermostat base to the subbase.

Set Heat Anticipator

Snap on Cover

Align the cover with the base and snap it onto the base.

New Thermostat Operation

Specifications

Troubleshooting

White Rodgers M100 Specifications

General IconGeneral
BrandWhite Rodgers
ModelM100
CategoryThermostat
LanguageEnglish

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