Pump runs briefly then stops with E08, especially under heavy load

Safety first: Turn off power before tightening any terminals. Use a properly rated multimeter.

• Measure running voltage: Start the pump and measure voltage at the pump terminals under load. If it drops significantly below the nameplate value, investigate the supply.
• Check cable sizing: Compare installed cable size and run length with Lowara’s recommendations. Upgrade to a larger gauge if voltage drop exceeds acceptable limits.
• Inspect connections: Tighten all line and neutral terminals in the distribution board, contactor, and pump control box.
• Dedicated circuit: Ensure the pump is on a dedicated circuit not shared with large appliances that cause dips.
• When to call a pro: If supply issues cannot be corrected locally, consult an electrician or the utility. Persistent E08 with correct voltage may indicate a faulty voltage sensing circuit in the drive.