TROUBLESHOOTING
Symptom | Possible Cause | Corrective Action | |
NoHeat/NoCool/NoFan | 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 |
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| panel loose or not properly installed. | safety interlock or door switch. |
No Heat | 1. | Pilot light not lit. | |
| 2. | System Switch not set to Heat. | Set System Switch to Heat and raise setpoint |
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| above room temperature. |
| 3. | Loose connection to thermostat or system. | Verify thermostat and system wires are securely |
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| attached. |
| 4. | Furnace | Many furnaces have safety devices that shut the |
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| be intermittent. | system down when a |
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| If the heat works intermittently contact the furnace |
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| manufacturer or local service person for assistance. |
| 5. Heating System requires service or | Diagnostic: Set System Switch to Heat and raise | |
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| thermostat requires replacement. | the setpoint above room temperature. Within a few |
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| seconds the thermostat should make a soft click |
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| sound. This sound usually indicates the thermostat |
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| is operating properly. If the thermostat does not |
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| click, try the reset operation listed above. If the |
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| thermostat does not click after being reset contact |
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| your heating and cooling service person or place |
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| of purchase for a replacement. If the thermostat |
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| clicks, contact the furnace manufacturer or a |
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| service person to verify the heating system is |
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| operating correctly. |
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). |
Heat, Cool or Fan Runs Constantly. | 1. | Possible short in wiring. | Check each wire connection to verify they are |
| 2. | Possible short in thermostat. | not shorted or touching together. No bare wire |
| 3. | Possible short in Heat/Cool/Fan system. | should stick out from under terminal screws. |
| 4. | Fan Switch set to Fan On. | Try resetting the thermostat. If the condition |
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| persists the manufacturer of your system |
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| or service person can instruct you on how |
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| to test the Heat/Cool system for correct |
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| operation. If the system operates correctly, |
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| 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 for |
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| 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. |
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. |
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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| 7 | occurs use the Reset Operation listed above. |
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