What summer storms do to a kitchen control board

North Florida gets on the order of sixty-eight thunderstorm days a year. Between June and September the afternoon storm is not weather, it is a schedule.

We replace more electronic controls in that stretch than in the other eight months combined, and the reason is not the dramatic one people assume.

It is almost never a direct strike

A direct strike destroys things visibly. Scorched traces, a smell, several appliances dead at once. It happens, and when it does the insurance conversation is straightforward because the evidence is obvious.

The common case is different and much duller. A storm cell causes a brief sag, a swell, or a fast transient on the supply. Nothing trips. Nothing looks different. The lights do not even flicker. But the power supply section of a control board — the part that turns line voltage into the low voltage the logic runs on — takes a small hit.

None of those hits kills it. The accumulation does. That is why boards fail on an afternoon when nothing in particular happened, months after the event that actually started it.

Why kitchen boards are more exposed than most electronics

Three things stack up.

They live hot. A board mounted under a cooking surface or beside an oven cavity runs at an ambient a laptop would refuse. Electrolytic capacitors age by temperature more than by time, and the power supply section is where the electrolytics are.

They are always energised. A cooking appliance is on the supply twenty-four hours a day whether or not it is cooking, so it is exposed to every event on the line, not only the ones during dinner.

They are single points of failure. When a board goes, the appliance is not degraded, it is off.

What the symptoms look like

• A display that is dark but the appliance still has power at the outlet.
• Controls that respond, then reset themselves after a few minutes.
• A hood whose lights work but whose fan will not start, or the reverse.
• An oven that reaches temperature but ignores a mode change.
• Anything that behaves differently after a storm than it did before one.

That last one is the useful sentence. If you can tell us the appliance changed behaviour on a specific afternoon, that saves us an hour.

What actually helps

A whole-house surge device at the panel. It is the only measure that catches events before they are inside your walls, and it is the one worth spending money on. It is an electrician’s job, not ours, but we will say plainly that it is the single most cost-effective thing a household on this coast can do for its built-in appliances.

Point-of-use protection where an appliance is plugged rather than hardwired. Useful, and much less useful than the panel device, because it only protects what is behind it.

Not unplugging things during a storm. People suggest this. It is impractical for hardwired cooking appliances and it does nothing about the sags and swells that do most of the actual damage.

What we do about it on a call

We check supply before we condemn a board. Voltage at the appliance, neutral integrity, and whether the circuit is the one the appliance expects — because an older kitchen sometimes is not giving a modern appliance what it needs, and a board that keeps dying is occasionally reporting a wiring problem rather than having a manufacturing one.

Replacing a board without asking why the last one died is how a customer buys the same part twice.