I have a couple that sya 3, and I have 2 that say 5.
Atleast one of the ones that says 5 is from 4 seasons training.
A rep from some place gave me several of them.
Contractor locator map
How many times must one fix something before it is fixed?
I've run across several units in the last few days with too small Frags and overcharged. Everything worked fine until something changed or went wrong. I always check airflow first.