Hayward Electrical Interference or Voltage Drop

Heater display flickers or resets when pump or other equipment turns on.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Shared circuit with high-load equipment, Loose neutral or ground, Undersized wiring, Electrical noise from variable-speed drive

Safety First: Turn off power at the breaker before tightening any electrical connections.

Dedicated circuit: Verify the heater is on a dedicated circuit sized per Hayward specifications.
Tighten connections: Check all lugs at the heater terminal block, breaker, and junction boxes for tightness.
Measure voltage: Have an electrician measure voltage at the heater during pump startup to check for excessive drop.
Install surge/noise protection: Consider adding a surge protector or line filter if electrical noise is suspected.

Hard 4/5

Power Wiring Harness

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