You adaptice defrost timer is bad, this is item 13 in the diagram below, it is part number 61005988 and can be ordered at www.apwagner.com or www.repairclinic.com, just check one more thing turn the temps all the way up and see if the unit starts, I have seen customers accidently turn off thier units and did not realize it.
Home Appliance Technician
Maytag , Whirlpool & Kenmore Factory Trained Service Tech