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Too much pressure from a power washer can have a variety of causes, but one of the most common is a spray nozzle that is too small. Pressure washer repair in this case is a matter of using the right sized nozzle, simple as that. Another common problem is a broken pressure gauge, which can show no pressure, too much pressure, or any combination of false readings. Check these two areas first when trying to diagnose a pressure problem with your power washer. If those two problems are ruled out, you could have a faulty regulator or an improperly adjusted unloader.