| Alarm Codes and Troubleshooting | |
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Alarm ID | Message Name | Action required to Clear/Recover |
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410 | Open Low Pressure Switch | Remove any blockages or restrictions from indoor coils and/or fans. Check refrigerant charge and system operation. |
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411 | Low Pressure Switch Strikes Lockout | Check system charge using approach and sub cooling temperatures. Reset by putting outdoor board in test |
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| mode or resetting low voltage power. |
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412 | Open High Pressure Switch | Check system operating pressures and compare to unit charging charts. |
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413 | High Pressure Switch Strikes Lockout | Check system charge using approach and sub cooling temperatures. Reset by putting outdoor board in test |
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| mode or resetting low voltage power. |
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414 | High Discharge Line Temperature | Check system operating pressures and compare to unit charging charts. |
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415 | High Discharge Line Temperature Strikes Lock- | Check system charge using approach and sub cooling temperatures. Reset by putting outdoor board in test |
| out | mode or resetting low voltage power. |
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416 | Outdoor Coil Sensor Faulty | Sensor being detected open or shorted or out of temperature range. Board will not perform demand or time/tem- |
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| perature defrost operation. (System will still heat or cool). |
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417 | Discharge Sensor Faulty | The board detects open sensor or out of temperature sensor range. This fault is detected by allowing the unit to |
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| run for 90 seconds before checking sensor resistance. If the sensor resistances not within range after 90 sec- |
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| onds, the board will count one fault. After 5 faults, the board will lockout. |
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418 | W Output Hardware Fault | Replace the control board. |
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419 | W Output Hardware Fault Lockout |
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420 | Defrost Out of Control | Defrost longer than 20 minutes. Check HP operation. |
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421 | W External Miswire Alarm | Check and correct the wiring. |
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530 | Damper End Switch Failed to Close | Repair/replace damper. |
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531 | Damper End Switch Failed to Open | Repair/replace damper. |
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532 | Damper Control Module Alarm | Check/replace if needed. |
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594 | Discharge Air Temperature Sensor Problem | Check wiring. Ohm out sensor and check to temperature/resistance chart. |
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700 | Comfort Sensor Temperature Sensor Problem | Recalibrate stat to clear, replace thermostat if needed. |
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701 | Comfort Sensor Temperature Too High | Recalibrate stat to clear, cool down stat, adjust setpoint, replace thermostat if needed. |
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702 | Comfort Sensor Temperature Too Low | Recalibrate stat to clear, warm up stat, adjust setpoint, replace thermostat if needed. |
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703 | Comfort Sensor Humidity Sensor Problem | Recalibrate stat to clear, adjust setpoint, replace thermostat if needed. |
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704 | Comfort Sensor Humidity Too High | Recalibrate stat to clear, replace thermostat if needed. |
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705 | Comfort Sensor Humidity Too Low | Recalibrate stat to clear replace thermostat if needed. |
Page 35 | icomfortt Touch Screen 7−Day Programmable Thermostat |
