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