Heater shows E12 and will not start; may occur after wiring changes

Safety first: Turn OFF power at the main breaker and verify with a meter that power is off before opening the electrical compartment.

• Confirm voltage: Using a multimeter (by a qualified person), verify that the supply voltage matches the Poolworld heater rating (typically 240 V). Incorrect voltage can trigger E12.
• Check polarity: Ensure line and neutral (if used) are connected to the correct terminals as labeled in the heater's junction box.
• Tighten terminals: Inspect all power lugs and tighten any loose screws. Look for signs of overheating or discoloration on wires and terminals.
• Dedicated circuit: Confirm the heater is on a dedicated circuit with the correct breaker size as specified by Poolworld. Overloaded circuits can cause low voltage under load.

Warning: If you are not experienced with electrical work, hire a licensed electrician. Incorrect wiring can cause fire or electric shock.