I am a biomedical engineer and a user of the medtronic paradigm 522 insulin pump. I have recently ran into the dreaded button error that many people have with this specific pump. I have devised a work-around to make the pump usable again (until a replacement is sent.)
If you peel back the adhesive cover for the buttons, you will see the circuit and metallic part for the buttons..
The button error is caused by moisture getting in between the silver metal and gold contact. Use a blow dryer to drive out any moisture and test out the pump by turning it on
Hopes this helps somebody out there...
I can repair (or try to repair) your pump if you have NO OTHER OPTIONS and have NO INSURANCE. Leave me a message.
Shame on you Medtronic for not being able to repair such a simple problem..