Pump display shows E14 indicating DC bus undervoltage; motor may stall or fail to start at higher speeds.

Safety First: Turn OFF power before tightening any terminals.

• Check supply voltage under load: With the pump running (if possible), measure voltage at the pump terminals. Significant drop when starting or at high speed indicates wiring or supply issues.
• Tighten terminals: Turn power OFF and tighten all line and neutral lugs in the Rheem pump and at the breaker panel. Look for heat discoloration indicating poor connections.
• Verify wire size: Compare installed wire gauge and run length to Rheem's installation guide. Upgrade wiring if voltage drop exceeds recommended limits.
• Inspect drive components: If supply is stable but E14 persists, the rectifier or DC bus capacitors may be failing. Replace the Rheem drive/motor assembly.
• Avoid shared circuits: Ensure the pump is on a dedicated circuit to prevent voltage sag when other large loads start.