Dyna-glo parts. I have a natural gas wall mounted Dyna-glo heater about 5 years old . Model # is

Question

I have a natural gas wall mounted Dyna-glo heater about 5 years old . Model # is RMC-40NGT.... I am trying to find a source for replacement parts as i believe that the thermocouple has died. The pilot lights but goes out after releasing it .. Sometimes it will light but goes out a few seconds later, and a small "click is heard..