GE heat pump water heater displays F9 and may not heat properly.

Safety: Turn off power at the breaker. Refrigerant is under pressure and requires special handling.

User checks:

• Visual inspection: Look for oily residue on refrigerant lines, around joints, and on the evaporator or condenser coils, which can indicate a leak.
• Airflow and filters: Ensure air filters (if equipped) and grilles are clean to avoid false low-pressure conditions.
• Reset: Restore power and see if the code clears temporarily.

Professional diagnosis: A certified technician must connect gauges, locate leaks, repair tubing, replace the filter-drier if needed, evacuate, and recharge the system to GE specifications. The low-pressure switch may also need replacement.