Okay thank you for the clarification lol
To be honest I don't trust anything they sell at Petsmart or Petco...etc. There are so many better products out there. The one's they sell such as the thermostats are expensive and hardly work properly-- basically crap
I would definitely return it. Explain to them you cannot get it to work and see if you will give you a refund. Then take your money and invest in something like the Hydrofarm Thermostat on amazon. I had a dinky Thermo I had bought from Petsmart prior and I got so fed up with it.
The Hydrofarm is definitely a good product, inexpensive, and a great investment.
Here is the link:
http://www.amazon.com/Hydrofarm-MTPR...1546007&sr=8-1