Gas source is balloon 33 liters. we have used these since very beginning when we started roasting some 5 years ago. This problem has never occurred before. The regulator is correct one. With exact 50 mbar pressure transformer.
The problem appears even with full balloons
The problem is new. First time it happened aprox. few months ago.
No settings has been modified on roaster cause i am in charge of all roasting stuff. And i have not changed anything.
The thing is that the problem appears and after 2-4 batches it disappears. :/
Might it be an issue inside flame controller or burner? Thou, the burner is not logical to cause such problem.