Did you remove the fixed resistor that was across the two wires?
If so you have one of the Russian heaters that cannot use an external temp sensor as mentioned earlier - you are out of luck! Should have bought from a reputable source not cousin Vlad.
If so you have one of the Russian heaters that cannot use an external temp sensor as mentioned earlier - you are out of luck! Should have bought from a reputable source not cousin Vlad.