Commercial oven down after a power surge.
Fuses that failed every time the oven switched on led us to a damaged contactor. Here’s how we isolated the problem—and what we found inside the removed part.
The call
A store called us about a commercial oven that wasn’t working. The kitchen had recently experienced a power surge that affected its equipment, so that history was an important part of the diagnosis.
Tracing the short
During inspection, we found that the oven’s internal fuses would blow when the oven turned on. Rather than treating the fuse as the problem, we traced what was happening at startup.
The fault appeared when the contactor energized: it would short and blow the fuse. A contactor is an electrically operated switch that controls power to equipment. In this case, it was the component behind the repeated fuse failures.
The repair—and the evidence
We replaced the faulty contactor. After removing it, we took it apart to inspect the coil inside. The coil had visible burn marks, supporting our diagnosis that the contactor had been damaged by the power surge the store reported.
The takeaway
A blown fuse is a symptom, not always the cause. When it fails repeatedly, the important question is what is creating the fault. In this oven, tracing the sequence led to a specific component repair—not a recommendation to replace the entire oven.
After a kitchen power surge
- Stop using equipment that repeatedly blows fuses or trips protection. Don’t keep resetting it to get through a shift.
- Tell your technician when the surge happened and which equipment was affected.
- Leave internal electrical checks to a qualified technician. Never bypass a fuse or install a higher-rated fuse to stop it blowing.