TROUBLESHOOTING
Symptom | Possible Cause | Corrective Action |
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Furnace Inducer Fan, | In power stealing mode (RC/PS Switch | 1. Add a common connection from the system |
Blower or Heat Turns On | set to PS), the thermostat draws a small | transformer to the "C" terminal on the thermostat |
with No Call for Heat or | amount of power through the heating | and set the RC/PS switch to RC. |
does not Turn Off when | circuit to operate. Some furnace | 2. If the system has a standard cooling contactor |
Call for Heat Ends | systems using high impedance input | and no common connection is available at the |
| electronic modules may react to the | thermostat, clip jumper |
| current draw and actuate system | ends. This prevents the thermostat from drawing |
| components. | power from the W1 (heating) circuit. If the condition |
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| persists after clipping the jumper, a heating and |
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| cooling service person can install an isolation relay |
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| to the system or add a common wire as mentioned |
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| above. |
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Antenna + Fault | 1. Loss of power from heating/cooling | 1. Verify the thermostat is operating on AC power by |
| system to thermostat. | removing the thermostat batteries. If display goes |
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| blank, AC power is lost. |
| 2. Remote sensor too far from | 2. Change remote sensor location. |
| thermostat. |
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| 3. Thermostat or remote sensor set to | 3. Verify the thermostat and remote sensor are set |
| different channels or a different | to the same channel and frequency offset. |
| frequency offset. |
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| 4. Incorrect sensor identification | 4. For indoor sensor, verify sensor identification |
| selected. | selected is A, B or C. For an outdoor sensor, verify |
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| the sensor identification selected is O. |
| 5. Replacement Sensor requires | 5. If the sensor did not come with this thermostat |
| running learn mode. | from the factory, perform the learn procedure for |
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| thermostat and sensor. |
| 6. Remote sensor requires replacement. | 6. If the sensor display indicate E0 or E1, replace |
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| the remote sensor. |
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Temperature Difference | 1. Improper system sizing or improper | Selecting a high or low priority for the thermostat or |
between Thermostat | heating and cooling distribution | sensor location during program periods can help |
and Remote Location | between areas. | even out minor temperature imbalances between |
| 2. An uneven change in occupancy | the thermostat and remote sensor locations. This is |
| level, sun load or conditioned space | also useful for scheduled or predictable events like |
| activities (cooking, washing dishes, | occupancy level or sun load during particular times |
| showers, etc.) between the areas. | of the day. If the temperature difference remains |
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| large after assigning priorities, system modification |
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| or zoning may be necessary to balance the tem- |
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| perature distribution. |
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Heat, Cool or Fan | 1. Possible short in wiring. | Check each wire connection to verify they are not |
Runs Constantly | 2. Possible short in thermostat. | shorted or touching together. No bare wire should |
| 3. Possible short in heat/cool/fan | stick out from under terminal screws. Try resetting |
| system. | the thermostat as described above. If the condition |
| 4. FAN Switch set to Fan ON. | persists the manufacturer of your system or service |
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| person can instruct you on how to test the Heat/Cool |
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| system for correct operation. If the system operates |
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| correctly, replace the thermostat. |
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