Generator attempts to start, cranks briefly, then stops and displays E1

Safety first: Move the generator control to OFF, open the main AC breaker, and disconnect the negative battery cable. Allow the engine to cool completely before checking oil.

• Check oil level: Remove the service panel and pull the dipstick. Oil should be between the FULL and ADD marks. Top up with the oil grade specified by Westinghouse (commonly SAE 5W-30 synthetic for many standby models) and recheck.
• Inspect for leaks: Look around the oil filter, drain plug, and crankcase gasket for fresh oil. Tighten the oil filter by hand (do not overtighten) and snug the drain plug if seeping is observed.
• Reset and test: Reconnect the battery, set the controller to MANUAL, and attempt a start. If the unit runs normally and E1 clears, monitor for recurring faults.
• Test oil pressure switch: With the battery disconnected, locate the oil pressure switch on the engine block. Disconnect its wire and check continuity to ground with a multimeter. On many designs, the switch is closed to ground with no pressure and opens when pressure builds. If it remains closed with the engine running (technician test only) or shows erratic readings, replace the switch.
• Inspect wiring: Trace the oil pressure switch lead back to the control board. Look for chafed insulation, loose spade connectors, or corrosion at terminals. Repair or replace damaged wiring.

If oil level and wiring are correct and E1 persists, have a technician verify actual oil pressure with a mechanical gauge; internal engine wear or oil pump failure may be present.