Pump Fault
Nilfisk Pressure Washer
Severity: ModerateWhat Does This Error Mean?
A Nilfisk pump that pulses or loses pressure usually has an air lock, a worn inlet valve, or a damaged seal. Purge the air first, then inspect seals and valves.
How to Fix It
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Purge air from the system
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Tighten inlet connections
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Check the inlet and outlet valves
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Inspect for pump leaks
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Check for freeze damage
Frequently Asked Questions
What causes a Nilfisk pump to pulse or surge?
Pulsing is caused by air in the pump system, a blocked inlet filter reducing flow rate, or a sticking pressure relief valve. Start with air purging and nozzle/filter checks.
How do I winterise a Nilfisk pressure washer?
After use, disconnect the water supply and run the machine briefly to expel residual water from the pump and hose. Then add a small amount of antifreeze solution through the inlet to protect the pump if storing in freezing conditions.
Is it worth repairing a Nilfisk pump or buying a new machine?
Pump seal kits cost under $20 and extend pump life significantly. For machines under 5 years old, a pump rebuild is usually worth it. Older machines with multiple faults may not justify repair.