6 SPECIFICATIONS
ELECTRICAL DATA
Electrical Rating:
0 to 30 VAC 50/60 Hz. or D.C.
0.05to 1.0 Amps (Load per terminal)
1.5Amps Maximum Total Load (All terminals combined)
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
7 TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation you can reset the thermo-
stat by pressing 
and 
at the same time while moving the SYSTEM switch from OFF to HEAT. This also resets the factory defaults. If the thermostat has power, has been reset
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® alkaline batteries.
Symptom | Possible Cause | Corrective Action | |
No Heat | 1. | Blown fuse or tripped circuit breaker. | Replace fuse or reset breaker. |
(common problems) | 2. | Furnace power switch to OFF. | Turn switch to ON. |
| 3. | Furnace blower compartment door or | Replace door panel in proper position to engage safety interlock or door switch. |
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| panel loose or not properly installed. |
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No Heat | 1. | Pilot light not lit. |
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| 2. | SYSTEM Switch not set to HEAT. | Set SYSTEM Switch to HEAT and raise temperature above room temperature. |
| 3. | Loose connection to thermostat or system. | Verify thermostat and system wires are securely attached. |
| 4. | Furnace | Many furnaces have safety devices that shut down when a |
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| be intermittent. | occurs. If the heat works intermittently contact the furnace manufacturer or |
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| local service person for assistance. |
| 5. | Heating system requires service or | Diagonistic: Set SYSTEM Switch to HEAT and raise the setpoint above room |
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| thermostat requires replacement. | temperature. Within a few seconds the thermostat should make a soft click |
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| sound. This sound usually indicates the thermostat is operating properly. If the |
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| thermostat does not click, try the reset operation listed above. If the thermostat |
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| does not click after being reset contact your heating and cooling service person |
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| or place of purchase for a replacement. If the thermostat clicks, contact the |
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| furnace manufacturer or a service person to verify the heating is operating |
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| correctly. |
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Heat, Runs | 1. | Possible short in wiring. | Check each wire connection to verify they are not shorted or touching together. |
Constantly | 2. | Possible short in thermostat. | No bare wire should stick out from under terminal screws. Try resetting the |
| 3. | Possible short in heat system. | thermostat as described above. If the condition persists the manufacturer of your |
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| system or service person can instruct you on how to test the Heat system for |
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| correct operation. If the system operates correctly, replace the thermostat. |
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Furnace Cycles Too | 1. | The location of the thermostat and/or the | Digital thermostats normally provide precise temperature control and may cycle |
Fast or Too Slow |
| size of the Heating System may be | faster than some older mechanical models. A faster cycle rate means the unit |
(narrow or wide |
| influencing the cycle rate. | turns on and off more frequently but runs for a shorter time so there is no |
temperature swing) |
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| increase in energy use. If you would like to increase the cycle time, clip |
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| Jumper |
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| is not possible to shorten the cycle time. If an acceptable cycle rate is not |
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| achieved as received or by clipping |
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| additional suggestions. |
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Thermostat Setting and | 1. | Thermostat thermometer setting requires | The thermometer can be adjusted +/- 3 degrees. See Temperature Display |
Thermostat |
| adjustment. | Adjustment in the Operation section. |
Thermometer Disagree |
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Blank Display and/or | 1. | Voltage spike or static discharge. | Replace batteries and check heat/cool system for proper operation. If a voltage |
Keypad Not Responding | 2. | Battery change required. | spike occurs use the Reset Operation listed above. |
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