8 TROUBLESHOOTING
CONTINUED FROM SEVENTH PAGE |
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Symptom |
| Possible Cause |
| Corrective Action | |
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No Heat (continued) |
| 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 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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| below room temperature. |
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| 2. | Loose connection to thermostat or system. |
| Verify thermostat and system wires are securely |
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| attached. |
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| 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. |
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Heat, Cool or Fan Runs Constantly. |
| 1. | Possible short in wiring. |
| Check each wire connection to verify they are not |
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| 2. | Possible short in thermostat. |
| shorted or touching together. No bare wire should |
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| 3. | Possible short in heat/cool/fan system. |
| stick out from under terminal screws. Try resetting |
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| 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 (Air Conditioning) Cycles Too Fast |
| 1. | The location of the thermostat and/or the |
| Digital thermostats normally provide precise |
or Too Slow (narrow or wide temperature |
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| size of the Heating (Cooling) System may |
| temperature control and may cycle faster than |
swing) |
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| be 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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Thermostat Setting and Thermostat |
| 1. | Thermostat thermometer setting requires |
| The thermometer can be adjusted +/- 3 degrees. |
Thermometer Disagree |
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| 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 |
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| 2. | AM or PM set incorrectly on the clock. |
| including the AM or PM designations for each |
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| 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. |
Blank Display and/or Keypad |
| 1. | Voltage spike or static discharge. |
| Use the Reset Operation listed above. |
Not Responding |
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