One fixture with a temperature problem suggests a local valve or mixing path more than a whole-house heater failure.
Repeatedly resetting a breaker, relighting a unit after a gas odor, or overriding a safety lockout can turn a service problem into a hazard. Report what happened and leave the protective response in place.
Keep this boundary: A no-hot-water complaint is not permission to defeat a cutoff, increase temperature excessively, or assume the tank needs replacement.