All service and warranty issues are handled directly with Philips Medical with Coffey Medical’s oversight to make sure our great customers are being taken care of promptly and professionally. Philips Customer Support for Zymed Holter can be reached at (800) 722-9377 ext 3 Option 1. Zymed DigiTrak XT Monitors have a 2 year warranty. Zymed software has a 90 day warranty that starts after installation and onsite training. A Service Agreement does not need to be purchased to handle software related questions.