FHP - Flashing Code 1

Florida Heat Pump: EM015

Re: Error Code 1 / Fault Code 1

Code 1 = High Pressure Switch Fault

Possible Causes (From Most to Least Likely):

1. High Refrigerant Discharge Pressure
   • Cooling
     • Low Water Flow
     • Refrigerant Overcharge
   • Heating
     • Low Airflow
     • Refrigerant Overcharge
2. Bad Pressure Switch

CHECKOUT

1. Check Refrigerant Pressures
   1. Cooling
      • Hook-up refrigerant gauges to the system.
      • Start unit and monitor pressures.
        • Normal R-22 Pressures = 55 - 75 Suction, 200 - 275 Discharge.
        • Normal R410A Pressures = 100 - 150 Suction, 275 - 400 Discharge.
      • Check temperature rise on water lines at the unit.
        • Normal water temperature rise = 9-15 deg.
      • High Head Pressure & Normal Temperature Rise = Refrigerant Overcharge
      • High Head Pressure & High Temperature Rise = Low Water Flow
   2. Heating
      • Hook-up refrigerant gauges to the system.
      • Start unit and monitor pressures.
        • Normal R-22 Pressures = 55 - 75 Suction, 200 - 275 Discharge.
        • Normal R410A Pressures = 100 - 150 Suction, 275 - 400 Discharge.
      • Check liquid line temperature entering expansion valve.
        • Normal temperature = ? deg.
      • High Head Pressure & Normal Temperature = Refrigerant Overcharge
      • High Head Pressure & High Temperature = Low Air Flow
2. Check Pressure Switch
   • If refrigerant discharge pressure stays in a normal range but still shows Code 1:
     • Check Pressure Switch
       • Without removing wires, check for 2VAC on both sides of the pressure switch.
         • Power on both sides = Switch Closed
         • Power on one side only = Switch Open (Bad Switch)