If your airless spray pump primes and pressurises but nothing happens when the trigger is pulled, and it is not the airless spray tip that is blocked, the actual spray gun hand piece could be where the problem is located.
The first thing that needs to be done is relieve all pressure from the airless spray system by opening the prime spray or bypass valve and turn the machine off.
Airless spray tip blocking is annoying and can ruin the spray painted surface with spatter or heavy lines of paint. There are a few common reasons causing airless spray tips to block and one of the most common is a problem with filtration of the paint within the airless spray equipment.
How many times have you gone to your local airless spray outlet to pick up an airless spray tip for a specific airless spray job and the airless tip size you need is not in stock? You may even end up phoning or travelling around several other outlets who stock airless spray tips and still not find the airless tip you need.
These days there are many places online where you can order brand-name quality airless spray tips and have the airless tip delivered for $20 to $25.
Apart for regular cleaning, lubricating, correct storage, and minor adjustment procedures, all of which can be carried out by owner operators of an airless spray machine, there is not usually any manufactuer issued servicing schedules for airless spray pumps that require regular "service" visits to a airless spray service centre.
A most common cause of airless spray gun problems and early failure are a result of incorrect cleaning and airless paint sprayer storage procedures.
When your airless paint spray job has completed the first step is to recover as much of the remaining paint that still remains in the airless spray unit. Consult your airless paint sprayer operation manual for the recommended procedure to remove any remaining paint from the airless machine and to properly flush the airless unit out.