Rheem M5350ti Installation Instructions - Page 16

Fault Code OFF LP & LP3 HP & HP3 FLo & FL3 FS -- Meaning of Code The desired programmed temperature point is lower than 60°F (15°C). Shortage of refrigerant gas in the unit or faulty low pressure control. The unit will show (LP3) after 3 LP faults and shuts down the unit and pool pump for protection. If this occurs, you should call for service. Low water flow in the unit or faulty high pressure control. Check water flow/backwash. The unit will show (HP3) after 3 HP faults. This will stop the unit for protection. Possible causes: • The filter is in backwash position. • The filter pump is stopped. • The filter is dirty. • Shortage of water to pool pump. • FIL parameter must be set to activate pool pump. • Water pressure switch must be adjusted or it is broken. • The unit is in the protection mode and will show (FL3), press any key to restart the unit. FL3 code will stop the unit and pool pump. Unit is in the defrosting cycle. (The fan works but the compressor is stopped.) Keypad is pressing down on both buttons. Replace keypad. Table C: Control Board Fault Codes - Digital Models 16