A qualified exterior house painter can walk you through the process of getting your house ready for a new coat of paint, from scraping and sanding to patching and priming. A pro can also recommend the best exterior paint for the job, whether your siding is wood, fiber cement, stucco, vinyl, or even metal. When it comes to getting the work done, your painter will arrive with all the tools and equipment needed to get the job done quickly, correctly and safely.
I agree with JHs. If there is no new color on it at all, just talk to the painter about it, if it was an honest mistake (which can happen very easily while painting) your painter should have no problem fixing it. However, in my years of experience, it is not unusual for 2 coats of door paint (good quality) not to cover very well at all. I once painted a red door 7 times, plus a tinted prime coat before I found the door to be a solid color.
Thanks, all, for your time & efforts adding to the article & comments, especially Dave urging requesting both General Liability AND Worker Compensation insurance certificates to protect from real & fraudulent liability--from my experience especially in California, where insurance fraud is a popular income thief, even causing car collisions to collect.