Raypak
Raypak Pool Pumps Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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AO
Raypak variable‑speed pump display shows AO or ALARM OVERCURRENT; pump stops or will not start.
Motor Overcurrent Protection Trip
dE
Raypak pump controller shows dE or DRIVE ERROR; pump will not run.
Internal Drive Electronics Fault
Er1
Raypak heat pump or controller displays Er1; unit will not operate.
Water Inlet Temperature Sensor Error
Er2
Raypak controller shows Er2; heating is disabled.
Water Outlet Temperature Sensor Error
Er3
Raypak heat pump displays Er3; unit may run fan only or shut down.
Ambient Air Temperature Sensor Error
Er4
Raypak controller shows Er4; unit will not heat.
Defrost Sensor or Coil Sensor Error
Er5
Raypak heat pump shows Er5; compressor will not start.
Compressor Overload or Discharge Temperature Error
Er6
Raypak controller displays Er6; unit is locked out.
Internal Control Board Communication Error
Er7
Raypak heat pump shows Er7; unit may not respond to keypad inputs.
Keypad or User Interface Error
Er8
Raypak controller shows Er8; unit may operate erratically or not at all.
EEPROM or Configuration Memory Error
FLO
Display shows FLO or FL0 and the Raypak unit will not run the compressor or heater; may click but not start.
Insufficient Water Flow / Flow Switch Open
FS
Raypak controller shows FS or FLOW SW error; unit will not start heating even though the pump is running.
Flow Switch Circuit Fault
HI
Display shows HI or HIGH TEMP; Raypak unit shuts down and will not heat until cooled.
High Water Temperature or Outlet Sensor Trip
HP
Pool pump / heat pump stops and display shows HP; unit may shut down shortly after starting, especially in hot weather or with restricted water flow.
High Pressure Refrigerant Lockout
LO
Raypak heat pump or pump/heat combo displays LO or LOW TEMP and will not heat; unit may run fan only.
Low Ambient Temperature Lockout
LO FLO
Raypak display alternates between LO FLO and water temperature; unit may start and stop repeatedly.
Marginal Water Flow Condition
LP
Raypak pool heat pump or pump/heat combo displays LP and will not heat; unit may attempt to start and then shut down.
Low Pressure Refrigerant Lockout
OC
Raypak pump display shows OC or OVERCURRENT; pump may start then trip quickly.
Overcurrent / Locked Rotor Condition
OV
Display shows OV or OVERVOLT; Raypak pump shuts down to protect electronics.
Overvoltage Supply Fault
Pr
Raypak variable‑speed pump display shows Pr or PRIME FAIL; pump shuts off after a priming attempt.
Priming Failure / Loss of Suction
PS
Display shows PS or PRESS SW error; Raypak unit will not start or shuts down shortly after starting.
Water Pressure Switch Open
SEN
Display shows SEN, SENSOR, or a similar code; unit may not start or may shut down intermittently.
Water Temperature Sensor Fault
UV
Raypak variable‑speed pump or control shows UV or UNDERVOLT; pump may not start or may run erratically.
Undervoltage Supply Fault
Symptom
Raypak heat pump display is blank or unreadable, but the unit still seems to run.
Display or User Interface Failure
Symptom
Raypak heat pump emits a strong chemical or burning smell during operation.
Overheating Electrical or Plastic Components
Symptom
Raypak heat pump fan does not run, but compressor attempts to start or runs briefly.
Condenser Fan Failure
Symptom
Raypak heat pump frequently cycles on and off; short run times with frequent starts.
Short Cycling
Symptom
Raypak heat pump or pump/heat combo is excessively vibrating and noisy during operation.
Mechanical Vibration / Mounting Issue
Symptom
Raypak heat pump runs but causes the pool pump breaker to trip intermittently.
Electrical Overload or Short
Symptom
Raypak heat pump runs but does not heat the pool; water temperature does not increase.
No Heat Output
Symptom
Raypak heat pump trips the GFCI breaker immediately when turned on.
Ground Fault or Leakage Current
Symptom
Raypak pool pump hums but does not start; may trip breaker after a few seconds.
Locked Rotor or Failed Start Circuit
Symptom
Raypak pool pump runs but has very low flow; weak return jets and poor skimming.
Reduced Hydraulic Performance
Symptom
Raypak pool pump will not start at all; no lights or display on the pump or controller.
No Power to Pump
Symptom
Raypak pump is very noisy, with grinding or screeching sounds during operation.
Motor Bearing Failure
Symptom
Raypak pump loses prime and sucks air; pump basket runs dry or partially full of air.
Suction Air Leak / Loss of Prime
Symptom
Raypak pump makes a loud cavitation or rattling noise and the pump basket is full of bubbles.
Cavitation Due to Restricted Suction or Low Inlet Pressure
Symptom
Raypak pump or heat pump is leaking water from the bottom of the unit.
Internal Water Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| AO |
Raypak variable‑speed pump display shows AO or ALARM OVERCURRENT; pump stops or will not start.
|
Motor Overcurrent Protection Trip | View Details |
| dE |
Raypak pump controller shows dE or DRIVE ERROR; pump will not run.
|
Internal Drive Electronics Fault | View Details |
| Er1 |
Raypak heat pump or controller displays Er1; unit will not operate.
|
Water Inlet Temperature Sensor Error | View Details |
| Er2 |
Raypak controller shows Er2; heating is disabled.
|
Water Outlet Temperature Sensor Error | View Details |
| Er3 |
Raypak heat pump displays Er3; unit may run fan only or shut down.
|
Ambient Air Temperature Sensor Error | View Details |
| Er4 |
Raypak controller shows Er4; unit will not heat.
|
Defrost Sensor or Coil Sensor Error | View Details |
| Er5 |
Raypak heat pump shows Er5; compressor will not start.
|
Compressor Overload or Discharge Temperature Error | View Details |
| Er6 |
Raypak controller displays Er6; unit is locked out.
|
Internal Control Board Communication Error | View Details |
| Er7 |
Raypak heat pump shows Er7; unit may not respond to keypad inputs.
|
Keypad or User Interface Error | View Details |
| Er8 |
Raypak controller shows Er8; unit may operate erratically or not at all.
|
EEPROM or Configuration Memory Error | View Details |
| FLO |
Display shows FLO or FL0 and the Raypak unit will not run the compressor or heater; may click but not start.
|
Insufficient Water Flow / Flow Switch Open | View Details |
| FS |
Raypak controller shows FS or FLOW SW error; unit will not start heating even though the pump is running.
|
Flow Switch Circuit Fault | View Details |
| HI |
Display shows HI or HIGH TEMP; Raypak unit shuts down and will not heat until cooled.
|
High Water Temperature or Outlet Sensor Trip | View Details |
| HP |
Pool pump / heat pump stops and display shows HP; unit may shut down shortly after starting, especially in hot weather or with restricted water flow.
|
High Pressure Refrigerant Lockout | View Details |
| LO |
Raypak heat pump or pump/heat combo displays LO or LOW TEMP and will not heat; unit may run fan only.
|
Low Ambient Temperature Lockout | View Details |
| LO FLO |
Raypak display alternates between LO FLO and water temperature; unit may start and stop repeatedly.
|
Marginal Water Flow Condition | View Details |
| LP |
Raypak pool heat pump or pump/heat combo displays LP and will not heat; unit may attempt to start and then shut down.
|
Low Pressure Refrigerant Lockout | View Details |
| OC |
Raypak pump display shows OC or OVERCURRENT; pump may start then trip quickly.
|
Overcurrent / Locked Rotor Condition | View Details |
| OV |
Display shows OV or OVERVOLT; Raypak pump shuts down to protect electronics.
|
Overvoltage Supply Fault | View Details |
| Pr |
Raypak variable‑speed pump display shows Pr or PRIME FAIL; pump shuts off after a priming attempt.
|
Priming Failure / Loss of Suction | View Details |
| PS |
Display shows PS or PRESS SW error; Raypak unit will not start or shuts down shortly after starting.
|
Water Pressure Switch Open | View Details |
| SEN |
Display shows SEN, SENSOR, or a similar code; unit may not start or may shut down intermittently.
|
Water Temperature Sensor Fault | View Details |
| UV |
Raypak variable‑speed pump or control shows UV or UNDERVOLT; pump may not start or may run erratically.
|
Undervoltage Supply Fault | View Details |
| – |
Raypak heat pump display is blank or unreadable, but the unit still seems to run.
|
Display or User Interface Failure | View Details |
| – |
Raypak heat pump emits a strong chemical or burning smell during operation.
|
Overheating Electrical or Plastic Components | View Details |
| – |
Raypak heat pump fan does not run, but compressor attempts to start or runs briefly.
|
Condenser Fan Failure | View Details |
| – |
Raypak heat pump frequently cycles on and off; short run times with frequent starts.
|
Short Cycling | View Details |
| – |
Raypak heat pump or pump/heat combo is excessively vibrating and noisy during operation.
|
Mechanical Vibration / Mounting Issue | View Details |
| – |
Raypak heat pump runs but causes the pool pump breaker to trip intermittently.
|
Electrical Overload or Short | View Details |
| – |
Raypak heat pump runs but does not heat the pool; water temperature does not increase.
|
No Heat Output | View Details |
| – |
Raypak heat pump trips the GFCI breaker immediately when turned on.
|
Ground Fault or Leakage Current | View Details |
| – |
Raypak pool pump hums but does not start; may trip breaker after a few seconds.
|
Locked Rotor or Failed Start Circuit | View Details |
| – |
Raypak pool pump runs but has very low flow; weak return jets and poor skimming.
|
Reduced Hydraulic Performance | View Details |
| – |
Raypak pool pump will not start at all; no lights or display on the pump or controller.
|
No Power to Pump | View Details |
| – |
Raypak pump is very noisy, with grinding or screeching sounds during operation.
|
Motor Bearing Failure | View Details |
| – |
Raypak pump loses prime and sucks air; pump basket runs dry or partially full of air.
|
Suction Air Leak / Loss of Prime | View Details |
| – |
Raypak pump makes a loud cavitation or rattling noise and the pump basket is full of bubbles.
|
Cavitation Due to Restricted Suction or Low Inlet Pressure | View Details |
| – |
Raypak pump or heat pump is leaking water from the bottom of the unit.
|
Internal Water Leak | View Details |
No matching codes found
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