when you release trigger on the spray gun the motor will not shut off. This only happens when using the variable spray nozzle.

Hi,
I know little of these machines save the fact they have their own website and are a Home Depot product. Never even seen one except the pictures on the site which is at:
Husky Power Washer, Home Depot Pressure Washer | Pages
And the manual is there, which says to call Customer Service for this situation at 800.381.0999.
Peace,
Clarke