Rheem Heat Pump: RPNL / RPQL Re: Outdoor Fan Not Working These heat pump models have a control board which directly controls compressor and outdoor fan operation (no contactor). In the Cooling Mode, this condition should cause a Code 23: Hi Pressure Fault In the Heating Mode, this...

Rheem Heat Pumps: RPNL/RPQL Re: Lockout Codes "L" Terminal Output Flashes Description 1 Compressor running extremely long cycles 2 Low or High Pressure control trip 3 Unit short cycling 5 Compressor will not run 8 Control mis-operation ...

Rheem Heat Pump: RPNL / RPQL Re: Cooling - Low Pressure Lockout - Code L21 These heat pump models have a control board which monitors equipment operation. If the low pressure switch trips three times during a run-cycle, a "Hard-Lockout" Code L21 is generated and must be manually reset. ...