Pump trips the circuit breaker or RCD/GFCI immediately or within a few seconds of starting.

Safety first: Do not repeatedly reset a tripping breaker; this indicates a potentially dangerous fault. Turn off power and lock out if possible.

• Inspect cable and plug: Check the Emaux pump power cable and plug (if fitted) for cuts, burns, or crushed sections. Replace if damaged.
• Check terminal box: With power off, open the motor terminal box and look for moisture, corrosion, or burnt connections. Dry and clean as needed.
• Test insulation: Have a qualified electrician perform insulation resistance tests on the motor to determine if the windings are shorted to earth.
• Separate loads: Ensure the pump is on a dedicated circuit and that the breaker and RCD are correctly rated for the pump.

If tests show low insulation resistance or visible damage, replace the motor assembly. Do not operate the pump until the fault is corrected.