8 TROUBLESHOOTING
Symptom | Possible Cause | Corrective Action | |
No Heat (continued) | 5. | Heating system requires service or | Diagnostic: Set SYSTEM Switch to HEAT and |
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| raise 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 thermo- |
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| stat is operating properly. If the thermostat does |
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| not 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 is operating |
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| correctly. |
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No Cool | 1. | SYSTEM Switch not set to COOL. | Set SYSTEM Switch to COOL and lower setpoint |
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| temperature 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 | Same procedure as diagnostic for No Heat |
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| thermostat 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 the |
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| thermostat clicks in Cooling. |
Heat, Cool or Fan Runs Constantly. | 1. | Possible short in wiring. | Check each wire connection to verify they are not |
| 2. | Possible short in thermostat. | shorted or touching together. No bare wire should |
| 3. | Possible short in heat/cool/fan system. | stick out from under terminal screws. Try resetting |
| 4. | FAN Switch set to Fan ON. | the thermostat as described above. 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. |
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Furnace Cycles Too Fast or Too Slow | 1. | The location of the thermostat and/or the | Digital thermostats normally provide precise |
(narrow or wide temperature swing) |
| size of the Heating System may be | temperature control and may cycle faster than |
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| influencing the cycle rate. | some older mechanical models. A faster cycle |
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| rate means the unit turns on and off more |
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| frequently but runs for a shorter time so there is |
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| no increase in energy use. If you would like to |
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| increase the cycle time, clip Jumper |
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| mentioned in the instructions for Hydronic Heating |
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| Systems. It is not possible to shorten the cycle |
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| time. If an acceptable cycle rate is not achieved as |
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| received or by clipping |
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| service person for additional suggestions. |
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Cooling Cycles Too Fast or Too Slow | 1. | The location of the thermostat and the size | The cycle rate for cooling is fixed and can not be |
(narrow or wide temperature swing) |
| of the Cooling System can influence the | adjusted. Contact a local service person for |
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| cycle rate. | suggestions. |
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Thermostat Setting and Thermostat | 1. | Thermostat thermometer setting requires | The thermometer can be adjusted +/- 3 degrees. |
Thermometer Disagree |
| adjustment. | See Temperature Display Adjustment in the |
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| Operation section. |
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Thermostat Does Not Follow Program | 1. | AM or PM set incorrectly in program. | Check current clock and program settings |
| 2. | AM or PM set incorrectly on the clock. | including the AM or PM designations for each |
| 3. | Voltage spike or static discharge. | time period. If a voltage spike or a static discharge |
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| occurs use the Reset Operation listed above. |
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Blank Display and/or Keypad | 1. | Voltage spike or static discharge. | Replace batteries and check heat/cool system |
Not Responding | 2. | Battery change required. | for proper operation. If a voltage spike occurs use |
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| the Reset Operation listed above. |
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