Northeast Florida sees roughly 68 thunderstorm days a year. That number is the useful one, and it explains a failure pattern we see across all four First Coast counties every late summer: an appliance that worked faultlessly through the winter loses its display, its relay control or its ability to start a program in August or September.
The common assumption is that something was struck. Almost never. A direct strike destroys obviously and usually takes several things with it. What actually happens here is slower and much harder to see.
What a transient is, and why repetition matters
A nearby strike, a utility switching event, or a large motor starting on the same service produces a brief overvoltage on the line — microseconds to milliseconds, well above nominal. Appliance power supplies are built with some tolerance for this, and a single event usually passes without consequence.
The damage is cumulative. Each event stresses the same components: the metal-oxide varistor across the input, the electrolytic capacitors in the low-voltage supply, the solder joints under a relay that has been hammered. A varistor degrades a little every time it clamps, and it degrades silently — there is no indicator, and the appliance behaves normally right up until the protection is no longer there.
Over a season with 68 storm days, the count adds up. The board that fails in September is not failing because of the storm that week. It is failing because of the sixty before it.
How it presents
The early signs are behavioural rather than terminal, which is why they get dismissed:
- A program that will not start, then starts fine the next morning
- A display that resets or blanks briefly with no power interruption in the house
- A hood with working lights and a dead fan
- An oven that ignores one function while everything else works
- An appliance that trips the breaker only occasionally
- Several appliances behaving oddly in the same week
That last one is the diagnostic tell. Appliances do not coordinate. If the range, the dishwasher and the hood all develop personality in the same seven days, the common factor is the supply, not three simultaneous failures.
Why built-in kitchens are more exposed
A kitchen specified around built-in and professional equipment has far more electronics in it than a kitchen of freestanding appliances — an induction cooktop with inverter boards, wall ovens with their own controls, a refrigerator column, a dishwasher, a downdraft or hood control, sometimes a coffee system and a wine cabinet. Each is an independent target. The more boards on the circuit, the more likely one of them shows the damage first.
There is a second regional factor on the barrier islands. A board in a salt-laden, humid environment on 32082, 32250, 32266, 32233 or Amelia Island starts with less margin, because corrosion at the connectors and solder joints raises resistance before any transient arrives.
What actually reduces the risk
Whole-house surge protection at the panel. This is the measure that changes the odds. It clamps at the service entrance, before the energy reaches anything downstream, and it protects hard-wired appliances a plug-in strip cannot help. It is electrician work, not appliance work, but it is the recommendation we make most often on this subject.
Point-of-use protection where there is a plug. Useful as a second layer for anything cord-connected. It does nothing for a hard-wired cooktop or oven.
Replace protection that has done its job. A surge device that has absorbed years of events is not necessarily still working. Devices with a status indicator exist for exactly this reason.
In the historic belt, check the panel first. Riverside, Avondale, Old Ortega, San Marco and Old Mandarin kitchens frequently run on wiring that was extended rather than designed, and rarely have a dedicated 20-amp circuit for the kitchen at all. A marginal circuit does not cause transient damage, but it makes every other electrical symptom harder to read, and it is worth resolving before chasing an intermittent appliance fault.
When you call
Tell us the pattern, not just the symptom. “It stopped working” and “it stops working after a storm and is fine the next day” lead to two different visits. The second one tells us to bring diagnostic gear for the supply as well as for the appliance, and it is frequently the difference between one visit and two.