Trouble
-shooting
Page - 18
Pub. No.
Table 2 | Troubleshooting | ||
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Symptom | Possible Cause | Action | |
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| 1. Blown fuse or tripped circuit breaker. | 1. Replace fuse or reset breaker. | |
Display will not come on. | 2. Furnace power switch OFF. | 2. Turn switch to ON. | |
3. Furnace blower compartment door or panel | 3. Replace door panel in proper position to engage safety interlock or | ||
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| loose or not properly installed. | door switch. | |
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Temperature display is incorrect. | Temperature display needs calibration. | Calibrate Sensor - User Setup Step 49. | |
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Cannot set Heating setpoint | Deadband between Heating and Cooling set to high | Decrease Deadband setting - User Setup Step 42. | |
above 80 degrees | |||
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"Service" Flashing on and off. | Control EEPROM write error. | Press any key and Check / | |
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"Service" solid on and | Indoor temperature sensor open or shorted | Replace Control | |
temperature display. | |||
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| 1. Upper and/or lower temperature limits were | 1. Check the temperature setpoints: | |
Temperature setting will not | reached. | Heating limits are 40 - 85F. | |
change. (Example: Cannot set |
| Cooling limits are 65 - 90F. | |
heating higher or cooling lower). | 2. "Keypad locked" is displayed on LCD. | 2. Unlock keypad - press Up+Down arrow together until icon disappears. | |
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