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6
SPECIFICATIONS
ELECTRICAL DATA
Electrical Rating:
0 to 30 VAC 50/60 Hz. or D.C.
0.05 to 1.0 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
7
TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display or
causes erratic thermostat operation you can reset the thermostat
by pressing
and
SYSTEM switch from OFF to HEAT. This also resets the factory
defaults. If the thermostat has power, has been reset
Symptom
Possible Cause
No Heat
1.
(common problems)
2.
3.
No Heat
1.
2.
3.
4.
5.
Heat, Runs
1.
Constantly
2.
3.
Furnace Cycles Too
1.
Fast or Too Slow
(narrow or wide
temperature swing)
Thermostat Setting and
1.
Thermostat Thermometer
Disagree
Blank Display and/or
1.
Keypad Not Responding
2.
White-Rodgers is a division
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
4
of Emerson Electric Co.
at the same time while moving the
Blown fuse or tripped circuit breaker.
Furnace power switch to OFF.
Furnace blower compartment door or panel
loose or not properly installed.
Pilot light not lit.
HEAT.
SYSTEM Switch not set to
Loose connection to thermostat or system.
Furnace Lock-Out Condition. Heat may also be
intermittent.
Heating system requires service or thermostat
requires replacement.
Possible short in wiring.
Possible short in thermostat.
Possible short in heat system.
The location of the thermostat and/or the
size of the Heating System may be
influencing the cycle rate.
Thermostat thermometer setting requires
adjustment.
Voltage spike or static discharge.
Battery change required.
Homeowner Help Line: 1-800-284-2925
www.white-rodgers.com
www.emersonclimate.com
THERMAL DATA
Setpoint Temperature Range: 45°F to 90°F (7°C to 32°C)
Operating Ambient Temperature Range: 32°F to 105°F
Operating Humidity Range: 0 to 90% RH (non-condensing)
Shipping Temperature Range: -40°F to 150°F
and still does not function correctly contact your heating/cooling
service person or place of purchase.
Batteries
For optimum performance, we recommend replacing batteries
once a year with fresh "AAA" Energizer
Corrective Action
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety interlock or door switch.
Re-light pilot.
Set SYSTEM Switch to HEAT and raise temperature above room temperature.
Verify thermostat and system wires are securely attached.
Many furnaces have safety devices that shutdown when a lock-out condition
occurs. If the heat works intermittently contact the furnace manufacturer or local
service person for assistance.
Diagnostic: Set SYSTEM Switch to HEAT and raise the setpoint above room
temperature. Within a few seconds the thermostat should make a soft click sound.
This sound usually indicates the thermostat is operating properly. If the thermo-
stat does not click, try the reset operation listed above. If the thermostat does not
click after being reset contact your heating and cooling service person or place of
purchase for a replacement. If the thermostat clicks, contact the furnace manufac-
turer or a service person to verify the heating is operating correctly.
Check each wire connection to verify they are not shorted or touching together.
No bare wire should stick out from under terminal screws. Try resetting the
thermostat as described above. If the condition persists the manufacturer of your
system or service person can instruct you on how to test the Heat system for
correct operation. If the system operates correctly, replace the thermostat.
Digital thermostats normally provide precise temperature control and may
cycle faster than some older mechanical models. A faster cycle rate means the
unit turns on and off more frequently but runs for a shorter time so there is no
increase in energy use. If you would like to increase the cycle time, clip Jumper
W-905 as mentioned in the instructions for Hydronic Heating Systems. It is not
possible to shorten the cycle time. If an acceptable cycle rate is not achieved
as received or by clipping W-905 contact a local service person for additional
suggestions.
The thermometer can be adjusted +/- 3 degrees. See Temperature Display
Adjustment in the Operation section.
Replace batteries and check heat/cool system for proper operation. If a voltage
spike occurs use the Reset Operation listed above.
®
alkaline batteries.
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