I get no pressure

Sounds like a bad unloader valve. Do a search on "pressure washer unloader valve symptoms". When they are faulty there will either be little pressure or it will stop an engine abruptly. The engine will not just die down as it you were turning it off. It would stop cold.

possibly have worn seals inspect them and also unloader valve which normally has a spring

I found a small long spring disconnected from my throttle which made the engine run rough It is easy to reconnect and makes a big difference in engine performance. also, if there is a very dirty air filter-oil/dirt it will not start-replace filter.

Most people I run into with this problem are trying to get the cleaning solution to work with one of the high pressure tips, usually red, green, white or yellow. The only way to make the machine use the cleaning solution is with the low pressure, soap tip, usually black. With the high pressure tips there is too much back pressure for the solution to be picked up and mixed into the water stream.

http://www.husqvarna.com/us/support/

regulator

This could be your unloader valve taking in account the engine isn't surging. Does the engine run smooth? Do you have at least 50 psi water pressure feeding the pump? Inlet screen clogged? ALL tips act same way or no change?

check the non-return valves in the pump block. if these are damaged or dirty you pressure will be greatly reduced. they are located behind the 3 lage brass hexagonal caps.

I hope this helps

Replace the bypass valve, this is the most common problem. Failing that remove high & low pressure valves and ensure they are not blocked or worn