DPF differential pressure too high; ECU logs DPF restriction; engine derates and exhaust temperature rises.

Safety: Exhaust components are extremely hot during regeneration. Keep clear of exhaust outlet and flammable materials.

• Inspect pressure hoses: Locate the DPF differential pressure sensor and its hoses to the inlet and outlet of the DPF. Check for cracks, melting, or blockage. Clean or replace hoses as needed.
• Check sensor connector: Ensure the electrical connector is clean and fully seated. Replace the sensor if readings are erratic or out of range.
• Perform regeneration: Use Volvo Penta diagnostics or the generator controller to initiate a stationary DPF regeneration if allowed by the system. Follow all on-screen safety instructions.
• Review operating profile: Standby sets that rarely run at rated load can accumulate soot. Periodically run the generator at 60–80% load for at least an hour to maintain DPF health.
• DPF service: If restriction remains high after regeneration, the DPF may require off-engine cleaning or replacement by a qualified service provider.