What this code means, briefly
F42 on this cooktop means there may be a problem with the cooktop power control board, or with the wiring associated with it — that is what the manufacturer published for it, and no more. Treat the cooktop as out of use: the board this reading names is the one that switches power to the zones. One of the checks below is an owner check, and the rest of the work is behind a panel.
Error codes
Reference| Code | Meaning |
|---|---|
| F42 | There may be a problem with the Cooktop Power Control Board, or the associated wiring. |
What you actually observe
- More than one zone is affected, but not all of them — That pattern follows the connections on the power side rather than a single element.
- The function that the cooktop power control board serves is dead or erratic — The code names the part and its wiring together, and both present the same way from outside.
- NEAR MISS — several unrelated functions are out at once — That is upstream of the cooktop power control board — a supply or a control fault — and it is not this code.
What triggers F42, most likely first
- A high-current connection running hot at the board — It goes first because these are the heaviest connections in the appliance and the reading covers them: one that has loosened heats under load, and heat makes it worse, which is why it is found before the board is judged.
- Moisture or contamination at the connection — Steam, spillage and cleaning water all reach the connector before they reach the part, and a bridged or corroded pin fails the same check.
- A control board that no longer drives or reads that circuit — Last, deliberately: it is the most expensive candidate and it cannot be diagnosed at all until the three cheaper ones are cleared.
What to check first, second, third
- Record which zones fail and whether they fail cold or under load — Cold refusal and dropping out under load point at different halves of this reading.
- Ask whether anything smells hot after use — A hot smell near a high-current connection is a reason to stop using the appliance now rather than later.
- Body: Pin the symptom to one function before opening anything — a single dead function and a general misbehaviour lead to completely different work.
What an owner can safely do
- Check the outside of the appliance for what moved — A recent move, a service visit or a panel that has been off puts a loose connector at the top of the list.
About 10 min
- Switch off at the breaker, then note which zones failed and whether anything smelled hot — If there is any smell of heat or burning, leave the appliance isolated until it has been looked at.
About 10 min
- Copy the model details from the rating plate — This code covers a part and a harness that both differ across the family, so the plate decides the part.
About 5 min
- STOP HERE — the cooktop power control board and its wiring are behind a panel — Everything past this point is work next to live terminals, which is where an owner check ends.
Safety first
Safety
Isolate the cooktop at its circuit breaker before any panel comes off — a capacitor can hold a charge after the power is off, and this is a fixed high-current appliance rather than one you unplug. Put nothing cold or wet on hot glass. On a gas model, if you smell gas, leave the building and call the gas utility from outside.
When to call a technician
Call straight away if the appliance behaves unpredictably rather than simply missing one function, or if you can see or smell heat damage at a connector.
Nearby codes on the same appliance
Scope of this reading
What is written here is generalized to the KitchenAid cooktop line rather than to a single family. Deliberately absent: connector positions, wiring colours, part numbers and the service sequences for your particular build, all of which vary across the line and belong in the manual for your model. If a model-specific page for this code has been published it is linked from the index below, and that page outranks this one for your unit.
Links: - [KitchenAid cooktop error codes](/blog/kitchenaid-cooktop-error-codes)
The code index
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
