Hello, we have an empire RH65 propane B-vent heater and we replaced the thermocouple to try to correct the pilot problem but it didnt help...heater does the same thing..... this is what happens....depress the pilot button to get started, but we light the pilot flame with a lighter because the piezo sparker has no wire. (this is a "used" heater which worked last year but gave trouble toward end of season. it had piezo ignitor broken when got it.) but when you release the pilot button after depressing for well enough time..several minutes, the pilot goes out.Pilot will go out when you turn the knob to ON position to light main burner too. the pilot flame is big and blue and covers the thermocouple. There does not appear to be any "adjustment" on their placement anyway, they have a set bracket. So...any ideas? is there some "magnet" in the valve body that goes bad, turning gas flow off? or does the crazy vent blocking "eco switch" go bad? if there was dirt in the pilot orifice...would that produce a poor pilot flame? The pilot flame is good size. The propane tank regulator, as far as I know is producing adequate gas pressure to the heater itself. this seems to be a common problem with b-vents....any help on the specifics of this model would be very helpful. Thank you.