TROUBLESHOOTING
Reset Operation
Note: When thermostat is reset, installer configuration 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..
Symptom | Possible Cause | Corrective Action | |
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No Heat/No Cool/No Fan | 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 |
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| panel loose or not properly installed.. | interlock 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 |
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| may also be intermittent.. | a |
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| contact the furnace manufacturer or local HVAC service |
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| person for assistance.. |
| 3. | Heating system requires service or | Diagnostic: Set SYSTEM Switch to HEAT and raise the |
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| thermostat requires replacement.. | setpoint above room temperature.. Within a few seconds |
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| the thermostat should make a soft click sound.. This sound |
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| usually indicates the thermostat is operating properly.. If |
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| the thermostat does not click, try the reset operation listed |
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| above.. If the thermostat does not click after being reset |
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| contact your heating and cooling service person or place |
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| of purchase for a replacement.. If the thermostat clicks, |
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| contact the furnace manufacturer or a HVAC service |
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| 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 |
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| thermostat requires replacement.. | thermostat to COOL and lower the setpoint below the |
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| room temperature.. There may be up to a five minute delay |
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| before the thermostat 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 |
Runs Constantly | 2. | Possible short in thermostat.. | or touching together.. No bare wire should stick out from |
| 3. | Possible short in heat/cool/fan system.. | under terminal block.. Try resetting the thermostat as de- |
| 4. | FAN Switch set to Fan ON.. | scribed above.. If the condition persists the manufacturer |
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| of your system or service person can instruct you on how |
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| to test the Heat/Cool system for correct operation.. If the |
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| system operates correctly, replace the thermostat.. |
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Thermostat Setting & | 1. | Thermostat thermometer setting | The thermometer can be adjusted +/- 4 degrees.. See |
Thermostat Thermometer |
| requires adjustment.. | Temperature Display Adjustment in the Configuration |
Disagree |
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| Menu section.. |
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Furnace (Air Conditioner) | 1. | The location of the thermostat and/or | Digital thermostats provide precise control and cycle |
Cycles Too Fast or Too Slow |
| the size of the Heating System may | faster than older mechanical models.. The system turns |
(narrow or wide |
| be influencing the cycle rate.. | on and off more frequently but runs for a shorter time |
temperature swing) |
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| so there is no increase in energy use.. If you would like |
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| an increased cycle time, choose SL for slow cycle in the |
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| Configuration menu, step 7 (heat) or 8 (cool).. If an ac- |
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| ceptable cycle rate is not achieved, contact a local HVAC |
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| service person for additional suggestions.. |
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Forgot Keypad |
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| Press the menu key (key will disappear) and hold in for |
Lockout Code |
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| 20 seconds.. This unlocks the thermostat.. |
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Blank display any or keypad | 1.. Voltage Spike or static discharge | Use the Reset Operation shown above.. | |
not responding |
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"Call for Service" on display | Power applied to thermostat "L" terminal | Indicates the heat pump system is sending a signal (volt- | |
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| age) to the thermostat terminal marked "L".. It does not |
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| indicate a malfunction in the thermostat.. The manufac- |
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| turer of the Heat Pump system can determine the likely |
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| cause of Call for Service on the thermostat by identifying |
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| the component in the system sending power to the "L" |
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| terminal.. |
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Thermostat does not have | 1.. Earlier version of thermostat | To access the earlier version of instruction sheet | |
Menu Screen Numbers |
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| 1280 in Model Number Search |
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