TROUBLESHOOTING
Symptom | Possible Cause | Corrective Action | |
No Cool | 1. | SYSTEM Switch not set to COOL | Set SYSTEM Switch to COOL and lower setpoint |
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| below room temperature. |
| 2. | Loose connection to thermostat or system. | Verify thermostat and system wires are securely |
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| attached. |
| 3. | Cooling System requires service or thermostat | Same procedure as diagnostic for No Heat |
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| requires replacement. | condition except set the thermostat to COOL and |
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| lower the setpoint below the room temperature. |
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| There may be up to a five minute delay before |
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| the thermostat clicks in Cooling if the compressor |
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| menu (Item 6). |
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Heat, Cool or Fan Runs Constantly. | 1. | FAN Switch set to Fan ON. | Check each wire connection to verify they are |
| 2. | Possible short in wiring. | not shorted or touching together. No bare wire |
| 3. | Possible short in thermostat. | should stick out from under terminal screws. |
| 4. | Possible short in Heat/Cool/Fan system. | Try resetting the thermostat. If the condition |
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| persists the manufacturer of your system or |
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| service person can instruct you on how to test the |
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| Heat/Cool system for correct operation. If the |
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| system operates correctly, replace the thermostat. |
Furnace Cycles Too Fast or Too Slow | 1. The location of the thermostat and/or the size | Item 2 in the Configuration Menu is the adjustment | |
(narrow or wide temperature swing) |
| of the Heating System may be influencing the | that controls the cycle rate. If an acceptable cycle |
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| cycle rate. | rate is not achieved using the FA (Fast) or SL |
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| (Slow) adjustment contact a local service person |
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| for additional suggestions. |
Cooling Cycles Too Fast or Too Slow | 1. The location of the thermostat and/or the size | The cycle rate for cooling is fixed and can not be | |
(narrow or wide temperature swing) |
| of the Cooling System may be influencing the | adjusted. Contact a local service person for |
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| cycle rate. | suggestions. |
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Thermostat Setting and Thermometer | 1. | Thermostat thermometer setting requires | The thermometer can be adjusted +/- 4 degrees as |
Disagree |
| adjustment. | listed in item 7 of the Configuration Menu. No other |
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| adjustment is possible. |
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Clock Loses or Gains Time | 1. | Loss of power to thermostat and low batteries. | The thermostat will maintain its program in memory |
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| even with no power/no batteries but the clock time |
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| will be incorrect when power is restored. See No |
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| Heat/No Cool/No Fan (common problems) above |
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| for items to check in the system. |
Heat or Cool Starts Early | 1. | EMR activated | See Configuration Menu (Item 4). |
Thermostat Does Not Follow Program | 1. | AM or PM set incorrectly in program. | Check current clock and program settings including |
| 2. | AM or PM set incorrectly on the clock. | the AM or PM designations for each time period. |
| 3. | Voltage spike or static discharge. | If a voltage spike or static discharge occurs use the |
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| Reset Operation listed above. |
Blank Display and/or Keypad Not | 1. | Loss of power and dead batteries. | Replace batteries and check heat/cool system for |
Responding | 2. | Voltage Spike or Static Discharge. | proper operation. If a voltage spike or static discharge |
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| occurs use the Reset Operation listed above. |
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HOMEOWNER HELP LINE: 1-800-284-2925
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