If I put unit at low pressure the soap should Dipense but it does not.

Hi,
Sold by Home Depot and they have their own website at:
Husky Home Depot Power washers, Home Depot Husky Powerwasher Accessories, Parts for Husky Powerwasher (http://huskypowerwasher.com/index.php)
Peace,
Clarke
PS Sounds like a plugged line or failed wand.