F2
Aprilaire
Low Refrigerant Pressure / Low Suction Pressure Fault
Aprilaire dehumidifier shows F2 and cycles off quickly
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Low refrigerant charge due to leak, Severely restricted airflow across evaporator, Frosted or iced evaporator coil, Faulty low-pressure switch
How to Fix / Troubleshooting
Safety first: Turn off power before opening the cabinet. Refrigerant diagnosis must be done by a licensed technician.
- Inspect filter and coil: Check and clean/replace the air filter. Inspect the evaporator coil for dirt or ice buildup. If iced, allow to thaw completely and correct airflow issues.
- Check fan operation: Ensure the blower runs at full speed during operation. A weak or failing blower motor can cause low suction pressure.
- Look for oil stains: Visually inspect refrigerant tubing and joints for oily residue, which can indicate a leak.
- Professional leak check: If F2 persists after airflow corrections, have an HVAC technician perform a leak search, repair any leaks, evacuate, and recharge the system to factory specifications.
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Repair Difficulty
Professional Required
5/5
Required Part
Aprilaire Dehumidifier Sealed Refrigeration System
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