icomfort
Touch Screen 7−Day Programmable Thermostat
Page 35
Alarm Codes and Troubleshooting
Alarm ID
Action required to Clear/Recover
Message 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.
