i need to increase the water to full up the pot
First off, how long has this machine been in service? It may need De-scaling. Start by checking the strainer on the back of the machine to ensure it is clear and has a good flow. Line pressure has to be above 20 lb's. The timer is set for 2 min and 15 seconds. If you have adequate water pressure and flow this should provide a full pot. Next remove the dispersal nozzle and run you Bunn snake through the line to break out any minerals. Place on a empty basket and run a pot to flush. Replace the spray head. Now run a test pot. If it still is not full, you will have to tweak the timer.
FWIW,, I had been meticulously trying to program our bunn pots to be perfectly topped off. Multiple tries of water only or water plus grounds. Over and over. Recently had bunn training with some our new liquid coffee dispensers and was able to inquire with the instructor on an easier way to gets the pots full. He asked why do I want the pot full. Guess I didn't have a good answer other than that it just made sense to me. His answer was to follow the recipe from the coffee manufacturer. Whatever ounces of water they say to use set the pot to that. Whether it's full or not. Who cares. Lol. Seems so simple now. Not sure if that's what you're aiming for but figured I'd share some humility
It is desirable to have the pot full when just water, but the grounds do absorb some moisture and will normally be just below the bell at the end of brew for the maximum profit. But for me, I go more to flavor.
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