This is my first time commenting on anything here so be gentle.
I may be wrong but the photo of the t'stat looks like it is outside the refrigerated space, if not sorry, the A19BBC-2 has three terminals. C-NO-NC, a simple check to ground on any one will confirm voltage and which way t'stat is switched.
17 oz of refrigerant sounds to me like a reach in unit maybe two door.
Probably not much for safeties in circuit.
If you have not checked pressures and subcooling and superheat yet, don't call for help untill you do.