Generator cranks but will not start; no error code displayed on Siemens controller.

Safety first: Disable auto-start and keep clear of moving parts during crank attempts.

• Verify controller mode: Ensure the Siemens controller is set to AUTO or MANUAL as required and that a start command is actually being issued (utility fail or manual start button).
• Check fuel: Confirm gas valves are open and gas supply is available, or that diesel tank has sufficient fuel. For diesel, prime the fuel system using the manual pump and bleed air at injector lines if necessary.
• Inspect ignition (gas): For gas engines, remove a spark plug lead and use a spark tester to verify spark during crank. Replace ignition coil pack or spark plugs if no spark is present.
• Review recent changes: If wiring or settings were recently changed, restore them to the last known good configuration.
• Call technician if unresolved: Persistent no-start without codes may indicate deeper engine or controller issues requiring professional diagnostics.