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I have had this since may and was using it today with my foam lance. It seams to have a fault. It will constantly turn on and off every couple of seconds.
Sounds like the pump has failed, common enough problem, happened to me twice in the past with units I have owned, should be fixed under warranty by any authorised repairer.
Odd, from the noise you said it was making I'd have sworn it would have been a pump problem, but maybe it is the gun - just get it into a service agent methinks!