TROUBLESHOOTING
Reset Operation
Note: When thermostat is reset, installer confi guration menu settings and programming will reset to factory settings.
If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation, you can reset the thermo- stat by removing the wires from terminals R and C (do not short them together) and removing batteries for 2 minutes. After resetting the thermostat, replace the wires and batteries. If the thermostat has been reset and still does not function correctly contact your heating/cooling service person or place of purchase.
Note: Be sure to review the installer confi guration menu settings.
To reset the programming, clock and confi guration settings, press 
and 
and the VENT button simultaneously. The thermostat should go blank and then all segments will be displayed momentarily.
Symptom | Possible Cause | Corrective Action | |
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No Heat/No Cool/No | 1. | Blown fuse or tripped circuit breaker. | Replace fuse or reset breaker. |
Fan (common | 2. | Furnace power switch to OFF. | Turn switch to ON. |
problems) | 3. | Furnace blower compartment door or | Replace door panel in proper position to engage safety interlock |
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| panel loose or not properly installed. | or door switch. |
| 4. | Loose connection to thermostat or system. | Tighten connections. |
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No Heat | 1. | Pilot light not lit. | |
| 2. | Furnace | Many furnaces have safety devices that shut down when a lock- |
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| may also be intermittent. | out condition occurs. If the heat works intermittently contact the |
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| furnace manufacturer or local HVAC service person for assis- |
| 3. | Heating system requires service or | tance. |
| Diagnostic: Set SISTEMA Switch to Calor and raise the set- | ||
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| thermostat requires replacement. | point above room temperature. Within a few seconds the thermo- |
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| stat should make a soft click sound. This sound usually indicates |
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| the thermostat is operating properly. If the thermostat does not |
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| click, try the reset operation listed above. If the thermostat does |
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| not click after being reset contact your heating and cooling |
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| service person or place of purchase for a replacement. If the |
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| thermostat clicks, contact the furnace manufacturer or a HVAC |
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| service person to verify the heating is operating correctly. |
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No Cool | 1. | Cooling system requires service or | Same as diagnostic for No Heat condition except set the thermo- |
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| thermostat requires replacement. | stat to Frio and lower the setpoint below the room temperature. |
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| There may be up to a fi ve minute delay before the thermostat |
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| clicks in Cooling. |
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Heat, Cool or Fan | 1. | Possible short in wiring. | Check each wire connection to verify they are not shorted or |
Runs Constantly | 2. | Possible short in thermostat. | touching together. No bare wire should stick out from under ter- |
| 3. | Possible short in heat/cool/fan system. | minal block. Try resetting the thermostat as described above. If |
| 4. | VENT Switch set to VENT ON. | the condition persists the manufacturer of your system or service |
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| person can instruct you on how to test the Heat/Cool system for |
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| correct operation. If the system operates correctly, replace the |
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| thermostat. |
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Thermostat Setting & | 1. | Thermostat thermometer setting | The thermometer can be adjusted +/- 4 degrees. See Tempera- |
ThermostatThermometer |
| requires adjustment. | ture Display Adjustment in the Confi guration Menu section. |
Disagree |
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Furnace | 1. | The location of the thermostat and/or | Digital thermostats provide precise control and cycle |
(Air Conditioner) |
| the size of the Heating System may | faster than older mechanical models. The system turns |
Cycles Too Fast or Too |
| be infl uencing the cycle rate. | on and off more frequently but runs for a shorter time so |
Slow (narrow or wide |
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| there is no increase in energy use. If you would like an in- |
temperature swing) |
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| creased cycle time, choose bA for slow cycle in the Con- |
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| fi guration menu, step 6 (heat), 7 (cool) or 8 (heat pump). |
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| If an acceptable cycle rate is not achieved, contact a local |
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| service person for additional suggestions. |
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The Emerson logo is a trademark and service mark of Emerson Electric Co.
HOMEOWNER HELP LINE:
St. Louis, Missouri
