around here, once the Ansul ring is pulled,
EVERYTHING electrical on
the cooking line must be de-energized,

the gas valve must close ,

the MUA for the hood is shut down,

and the hood exhaust fans shall continue to run....

is the Ansul system cocked ? it sounds like it is tripped and needs to be reset.

unwire the ansul switch and reset the shunt breaker , that should tell you

pizza ovens in parallel or series???

Tom