TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation you can reset the thermo-
stat by pressing the reset button (see Fig 1). If the thermostat has power, has been reset and still does not function correctly contact your heating/cooling service person or place of pur- chase.
Symptom | Possible Cause | Corrective Action | |
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 |
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| panel loose or not properly installed. | safety interlock or door switch. |
No Heat | 1. | System Switch not set to Heat. | Set System Switch to Heat and raise setpoint |
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| above room temperature. |
| 2. | Loose connection to thermostat or system. | Verify thermostat and system wires are securely |
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| attached. |
| 3. | Heating System requires service or | Diagonistic: Set System Switch to Heat and raise |
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| thermostat requires replacement. | the setpoint above room temperature. Within a five |
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| minutes 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 7). |
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. Try |
| 4. | Fan Switch set to Fan On. | resetting the thermostat as described below. |
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| If the condition persists, the manufacturer of |
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| your system or service person can instruct you |
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| on how 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 8 of the Configuration Menu. No other |
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| adjustment is possible. |
Clock Loses or Gains Time | 1. | Loss of power to thermostat. | The thermostat will maintain its program in memory |
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| even with no power but the clock time will be |
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| 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 5). |
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. | Voltage Spike or Static Discharge. | If a voltage spike or static discharge occurs use the |
Responding |
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| Reset Operation listed above. |
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