AquaFlo
AquaFlo 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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E01
Pump will not start, digital controller powers on but motor does not run; a brief click or relay sound may be heard.
Motor Start Inhibit / No-Start Condition
E02
Pump starts then quickly shuts off within a few seconds; the controller may display E02 and will not restart until cooled.
Motor Thermal Overload Trip
E03
Digital display shows E03 and pump will not prime; the pump may run but no water flow is established.
Prime Failure / Dry-Run Protection
E04
Controller displays E04 and pump shuts down; this may occur during hot weather or long run cycles.
Controller Over-Temperature / Electronics Overheat
E05
Pump runs but the controller shows E05 and speed cannot be adjusted; the unit may be locked at one speed or shut down.
Speed Sensor / Tachometer Fault
E06
The display shows E06 and the pump will not run; this often occurs after a power surge or lightning event.
Overvoltage / Undervoltage Protection Trip
E07
The pump stops and displays E07; this may occur when the filter is dirty or valves are closed.
Overcurrent / Motor Overload Protection
E08
The controller shows E08 and the pump will not start; this is often accompanied by a humming noise or immediate trip.
Stalled Rotor / Locked Motor
E09
Display shows E09 and the pump stops; this may coincide with a GFCI or breaker tripping.
Ground Fault / Leakage Current Detected
E10
The controller displays E10, and the pump speed drops or shuts off; this may occur when filter pressure is very low.
Low Flow / Flow Sensor Fault
E11
E11 is displayed, and the pump will not respond to keypad commands; it may still run at a default speed.
Keypad / User Interface Communication Error
E12
The pump shows E12 and cannot communicate with an external automation system (e.g., pool controller).
External Communication / RS-485 Bus Error
E13
E13 is displayed; the pump stops unexpectedly and may restart after a delay.
Internal Drive Overheat / Inverter Protection
E14
The controller shows E14, and the pump will not start; this often occurs after incorrect wiring changes.
Phase Loss / Phase Imbalance (for 3-phase AquaFlo models)
E15
E15 is displayed; the pump runs erratically or stops when the speed is changed.
Parameter / Configuration Error
E16
The display shows E16; the pump may start but immediately shut down with a loud electrical buzz.
Short Circuit / Output Stage Fault
E17
E17 is displayed; the pump cannot detect water temperature or heater interlock status (on integrated systems).
Auxiliary Sensor / Heater Interlock Fault
E18
E18 is displayed; internal clock or schedule functions do not operate correctly.
Real-Time Clock / Backup Power Fault
E19
E19 displayed; pump cannot complete the priming cycle and times out repeatedly.
Extended Prime Timeout
E20
E20 displayed; pump indicates an internal memory or firmware error and may not start.
Internal Firmware / Memory Corruption
Symptom
Pump display is blank or very dim, but motor may still run or be controllable by automation.
Display / Power Supply Fault
Symptom
Pump emits a burning smell or visible smoke during operation.
Electrical Overheating / Insulation Breakdown
Symptom
Pump housing or plumbing vibrates excessively; the pump may move slightly on its base.
Excessive Vibration / Imbalance
Symptom
Pump hums but does not start; it may trip the breaker after a few seconds.
Failed Start Circuit / Capacitor
Symptom
Pump is leaking water from the area between the motor and the pump housing (drip from the bottom center).
Mechanical Shaft Seal Failure
Symptom
Pump is running but there is very low or no water flow at the pool returns; no error code is displayed.
Hydraulic Flow Restriction
Symptom
Pump makes loud grinding or screeching noises while running; the noise comes from the motor end.
Motor Bearing Failure
Symptom
Pump motor is extremely hot to the touch, even after short run times.
Overheating Motor
Symptom
Pump runs backwards (on 3‑phase models) with poor flow and noisy operation after wiring work.
Incorrect Phase Rotation
Symptom
Pump runs but is unusually loud with a rattling or cavitation sound; bubbles are visible under the pump lid.
Cavitation / Air Entrapment
Symptom
Pump runs but makes a high-pitched whine that changes with speed.
Drive or Electrical Noise
Symptom
Pump runs but pool water remains cloudy or dirty despite normal flow.
Inadequate Circulation / Filtration
Symptom
Pump shuts off when spa jets or water features are turned on; no error code shown.
Hydraulic Overload / High Head Condition
Symptom
Pump starts and stops repeatedly within short intervals without user input.
Short Cycling / Control Instability
Symptom
Pump trips the circuit breaker or GFCI immediately when turned on.
Short Circuit or Ground Fault
Symptom
Pump will not prime; the pump basket does not fill with water, and only air is visible under the lid.
Suction-Side Air Leak
Symptom
Pump will not start on schedule but runs when started manually.
Timer / Scheduling Misconfiguration
Symptom
Pump will not turn off from the keypad; continues running until breaker is switched off.
Stuck Relay / Control Logic Fault
Symptom
Water is leaking from the clear pump lid area when the pump is running.
Lid Seal Leak
Symptom
Water is leaking from the union connections at the pump inlet or outlet.
Union Seal Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Pump will not start, digital controller powers on but motor does not run; a brief click or relay sound may be heard.
|
Motor Start Inhibit / No-Start Condition | View Details |
| E02 |
Pump starts then quickly shuts off within a few seconds; the controller may display E02 and will not restart until cooled.
|
Motor Thermal Overload Trip | View Details |
| E03 |
Digital display shows E03 and pump will not prime; the pump may run but no water flow is established.
|
Prime Failure / Dry-Run Protection | View Details |
| E04 |
Controller displays E04 and pump shuts down; this may occur during hot weather or long run cycles.
|
Controller Over-Temperature / Electronics Overheat | View Details |
| E05 |
Pump runs but the controller shows E05 and speed cannot be adjusted; the unit may be locked at one speed or shut down.
|
Speed Sensor / Tachometer Fault | View Details |
| E06 |
The display shows E06 and the pump will not run; this often occurs after a power surge or lightning event.
|
Overvoltage / Undervoltage Protection Trip | View Details |
| E07 |
The pump stops and displays E07; this may occur when the filter is dirty or valves are closed.
|
Overcurrent / Motor Overload Protection | View Details |
| E08 |
The controller shows E08 and the pump will not start; this is often accompanied by a humming noise or immediate trip.
|
Stalled Rotor / Locked Motor | View Details |
| E09 |
Display shows E09 and the pump stops; this may coincide with a GFCI or breaker tripping.
|
Ground Fault / Leakage Current Detected | View Details |
| E10 |
The controller displays E10, and the pump speed drops or shuts off; this may occur when filter pressure is very low.
|
Low Flow / Flow Sensor Fault | View Details |
| E11 |
E11 is displayed, and the pump will not respond to keypad commands; it may still run at a default speed.
|
Keypad / User Interface Communication Error | View Details |
| E12 |
The pump shows E12 and cannot communicate with an external automation system (e.g., pool controller).
|
External Communication / RS-485 Bus Error | View Details |
| E13 |
E13 is displayed; the pump stops unexpectedly and may restart after a delay.
|
Internal Drive Overheat / Inverter Protection | View Details |
| E14 |
The controller shows E14, and the pump will not start; this often occurs after incorrect wiring changes.
|
Phase Loss / Phase Imbalance (for 3-phase AquaFlo models) | View Details |
| E15 |
E15 is displayed; the pump runs erratically or stops when the speed is changed.
|
Parameter / Configuration Error | View Details |
| E16 |
The display shows E16; the pump may start but immediately shut down with a loud electrical buzz.
|
Short Circuit / Output Stage Fault | View Details |
| E17 |
E17 is displayed; the pump cannot detect water temperature or heater interlock status (on integrated systems).
|
Auxiliary Sensor / Heater Interlock Fault | View Details |
| E18 |
E18 is displayed; internal clock or schedule functions do not operate correctly.
|
Real-Time Clock / Backup Power Fault | View Details |
| E19 |
E19 displayed; pump cannot complete the priming cycle and times out repeatedly.
|
Extended Prime Timeout | View Details |
| E20 |
E20 displayed; pump indicates an internal memory or firmware error and may not start.
|
Internal Firmware / Memory Corruption | View Details |
| – |
Pump display is blank or very dim, but motor may still run or be controllable by automation.
|
Display / Power Supply Fault | View Details |
| – |
Pump emits a burning smell or visible smoke during operation.
|
Electrical Overheating / Insulation Breakdown | View Details |
| – |
Pump housing or plumbing vibrates excessively; the pump may move slightly on its base.
|
Excessive Vibration / Imbalance | View Details |
| – |
Pump hums but does not start; it may trip the breaker after a few seconds.
|
Failed Start Circuit / Capacitor | View Details |
| – |
Pump is leaking water from the area between the motor and the pump housing (drip from the bottom center).
|
Mechanical Shaft Seal Failure | View Details |
| – |
Pump is running but there is very low or no water flow at the pool returns; no error code is displayed.
|
Hydraulic Flow Restriction | View Details |
| – |
Pump makes loud grinding or screeching noises while running; the noise comes from the motor end.
|
Motor Bearing Failure | View Details |
| – |
Pump motor is extremely hot to the touch, even after short run times.
|
Overheating Motor | View Details |
| – |
Pump runs backwards (on 3‑phase models) with poor flow and noisy operation after wiring work.
|
Incorrect Phase Rotation | View Details |
| – |
Pump runs but is unusually loud with a rattling or cavitation sound; bubbles are visible under the pump lid.
|
Cavitation / Air Entrapment | View Details |
| – |
Pump runs but makes a high-pitched whine that changes with speed.
|
Drive or Electrical Noise | View Details |
| – |
Pump runs but pool water remains cloudy or dirty despite normal flow.
|
Inadequate Circulation / Filtration | View Details |
| – |
Pump shuts off when spa jets or water features are turned on; no error code shown.
|
Hydraulic Overload / High Head Condition | View Details |
| – |
Pump starts and stops repeatedly within short intervals without user input.
|
Short Cycling / Control Instability | View Details |
| – |
Pump trips the circuit breaker or GFCI immediately when turned on.
|
Short Circuit or Ground Fault | View Details |
| – |
Pump will not prime; the pump basket does not fill with water, and only air is visible under the lid.
|
Suction-Side Air Leak | View Details |
| – |
Pump will not start on schedule but runs when started manually.
|
Timer / Scheduling Misconfiguration | View Details |
| – |
Pump will not turn off from the keypad; continues running until breaker is switched off.
|
Stuck Relay / Control Logic Fault | View Details |
| – |
Water is leaking from the clear pump lid area when the pump is running.
|
Lid Seal Leak | View Details |
| – |
Water is leaking from the union connections at the pump inlet or outlet.
|
Union Seal Leak | View Details |
No matching codes found
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