Walk-in Freezer repair not cooling enough in San Jose, California

The walk-in freezer showed 37F. And evaporator coil was fully over frozen. I did check defrost thermostat and heaters – they’re was ok. And then went to the roof and find that defrost timer won’t start defrost cycle. After replacing defrost timer – walk-in freezer started freezing as well.

https://fuseservice.cloud/freezer-true-t-49f-repair-in-san-jose-ca/

https://fuseservice.cloud/refrigerator-samsung-rs25h5111bc-fresh-food-side-not-cooling-enough-samsung-refrigerator-repair-san-jose-ca/