I could walk you through a list of tests, but the truth is the unit will need service. The good news is, you can now contact Durabrand and get the tests directly from their website. Please click on the link below:

Durabrand Technical Support, Parts and Accessories

http://1800customersupport.com/

If you require any additional assistance do not hesitate to click on the "ASK ME" button and I will respond to your request as soon sa I can.