U.S. Motors Pool Pumps Error Codes

E01

Digital U.S. Motors pool pump controller will not start the motor; display shows E01 and beeps once when START is pressed.

Low Line Voltage / Under-Voltage Lockout

E02

U.S. Motors variable-speed pool pump attempts to start, then stops within a few seconds and displays E02.

Over-Voltage / High Line Voltage Protection

E03

U.S. Motors digital pool pump shows E03 and will not run; sometimes starts then immediately shuts down.

Phase Loss / Phase Imbalance (Three-Phase Models)

E04

U.S. Motors variable-speed pool pump displays E04 and shuts down during operation, often when running at higher speeds.

Overcurrent / Motor Overload Trip

E05

U.S. Motors pool pump controller shows E05 immediately when START is pressed; motor does not attempt to turn.

Motor Open Circuit / No Motor Detected

E06

U.S. Motors variable-speed pool pump displays E06 and stops; may occur randomly during operation.

Ground Fault / Ground Leakage Detected

E07

U.S. Motors digital pool pump shows E07 and shuts down shortly after starting, especially in hot weather or when running at high speed.

Drive Over-Temperature / Electronics Overheat

E08

U.S. Motors variable-speed pool pump displays E08 and will not start; sometimes accompanied by a humming noise from the motor.

Stall Detection / Rotor Locked

E09

U.S. Motors pool pump controller shows E09 and the motor speed fluctuates or fails to reach set RPM.

Speed Feedback / Tachometer Fault (VS Motor)

E10

U.S. Motors digital pool pump displays E10 and stops; may occur when starting or during speed changes.

Internal Drive Fault / Self-Test Failure

E11

U.S. Motors pool pump controller shows E11 and the motor will not start; sometimes occurs after a power outage.

EEPROM / Memory Error

E12

U.S. Motors variable-speed pool pump shows E12 and runs only at a fixed low speed or not at all.

Communication Error Between User Interface and Drive

E13

U.S. Motors pool pump controller displays E13 and ignores external automation commands.

External Control Input Fault

E14

U.S. Motors variable-speed pool pump shows E14 and shuts down; may be accompanied by a loud electrical click.

Internal Relay / Contactor Fault

E15

U.S. Motors pool pump controller shows E15 and the motor runs briefly then stops, repeating this cycle.

Current Sensor / Shunt Fault

E16

U.S. Motors variable-speed pool pump displays E16 and refuses to start; may occur after incorrect wiring changes.

Incorrect Motor Wiring / Configuration Error

E17

U.S. Motors pool pump controller shows E17 and the display is dim or flickers; pump may shut off unexpectedly.

Low Control Voltage / Auxiliary Power Fault

E18

U.S. Motors variable-speed pool pump shows E18 and runs at reduced speed or shuts down when water flow is low.

Dry-Run / Low-Flow Protection (if equipped)

E19

U.S. Motors pool pump controller displays E19 and the pump will not respond to schedule changes or speed commands.

Internal Clock / Real-Time Clock Failure

Symptom

U.S. Motors pool pump causes loud water hammer or banging noises in the plumbing when starting or stopping.

Hydraulic Shock / Water Hammer

Symptom

U.S. Motors pool pump emits a burning smell or visible smoke from the motor housing.

Motor Winding Overheating / Electrical Short

Symptom

U.S. Motors pool pump emits a loud cavitation or gravelly sound, especially at higher speeds; pump basket may show swirling air.

Cavitation Due to Inadequate Suction Head

Symptom

U.S. Motors pool pump hums but will not start; motor housing gets warm and trips the breaker or thermal overload.

Failed Start Capacitor / Start Circuit (Single-Phase Motor)

Symptom

U.S. Motors pool pump is noisy with a rattling or grinding sound from the wet end; flow is reduced.

Impeller Damage or Debris

Symptom

U.S. Motors pool pump is very loud during operation, with a high-pitched whine or grinding noise from the motor end.

Motor Bearing Failure

Symptom

U.S. Motors pool pump leaks at the clear lid on top of the strainer housing; air bubbles may be visible under the lid.

Leaking Pump Lid O-Ring / Strainer Cover Seal

Symptom

U.S. Motors pool pump leaks water between the pump housing and motor, often dripping from the bottom of the motor.

Failed Mechanical Shaft Seal

Symptom

U.S. Motors pool pump loses prime frequently; pump basket does not stay full of water and suction is weak.

Suction Air Leak / Loss of Prime

Symptom

U.S. Motors pool pump motor is extremely hot to the touch but still running; thermal overload has not yet tripped.

Marginal Overheating / Ventilation Issue

Symptom

U.S. Motors pool pump motor runs but the pump does not move water; basket does not fill.

Loss of Prime / Disconnected Impeller

Symptom

U.S. Motors pool pump runs but has low flow; filter pressure is higher than normal.

Discharge Restriction / Dirty Filter

Symptom

U.S. Motors pool pump runs but has very low flow; pressure at the filter gauge is lower than normal.

Suction Restriction / Impeller Clog

Symptom

U.S. Motors pool pump runs but trips the breaker or thermal overload after 5–30 minutes of operation.

Overheating Motor / Continuous Overload

Symptom

U.S. Motors pool pump runs intermittently; it starts and stops randomly without user input.

Intermittent Power or Control Fault

Symptom

U.S. Motors pool pump trips a GFCI breaker immediately or within a few seconds of starting.

Ground Fault / Leakage Current

Symptom

U.S. Motors pool pump vibrates excessively and may move on the pad; plumbing shakes during operation.

Imbalance / Misalignment / Mounting Issues

Symptom

U.S. Motors pool pump will not start at all; no hum, no sound, and the motor shaft does not move.

No Power / Open Circuit to Pump

Symptom

U.S. Motors variable-speed pool pump display is blank or unreadable, but the pump may still run at a default speed.

Display / HMI Failure

Symptom

U.S. Motors variable-speed pool pump runs only at one speed and does not respond to speed changes on the keypad.

Control Interface / Keypad Failure