Controller displays E10, generator shuts down under load

Safety first: Turn OFF the generator and open the main breaker. Confirm that the ATS has transferred back to utility before working on the generator.

• Step 1 – Check load size: Review the connected loads on the ATS. Compare total running kW to the Multiquip generator's rated kW. If loads exceed rating, have an electrician redistribute or shed non‑critical loads.
• Step 2 – Inspect air and fuel systems: Replace a dirty air filter and fuel filter if service is overdue. Verify fuel supply pressure (for gas units) or fuel level and line condition (for diesel units).
• Step 3 – Inspect alternator and AVR wiring: With power off, check all alternator output lugs and AVR sense wires for tightness and corrosion. Clean and tighten as needed.
• Step 4 – Test no‑load voltage: Start the generator with no load and measure voltage. If it is low even with no load, suspect the AVR or alternator windings. Replace the AVR if adjustments do not restore correct voltage.
• Step 5 – Clear code and test under partial load: Clear E10, then apply a moderate load (50–75% rated) and monitor voltage. If undervoltage persists, a technician should test the alternator and engine output.