The short answer
The manufacturer's published entry for E91 gives a remedy rather than a component: power the unit down at its breaker for about a minute, then bring it back. That phrasing is deliberate — the code is documented as a transient that the control latched rather than a part that has failed. If it comes back after a proper power-down, it is no longer transient and the next step is a technician rather than another reset.
Error codes
Reference| Code | Meaning |
|---|---|
| E91 | Power unit down by turning off the circuit breaker(s) for one (1) minute. |
What you observe, and what to record
- The code appears and the display stops responding usefully — A latched state holds until power is removed, which is what the documented remedy is for.
- Whether anything on the same circuit misbehaves — Lights that dim, a breaker that has tripped before, or another appliance acting up all move the search away from this one.
- Whether the display shows anything besides the code — A second code, a flashing indicator or a missing segment is information the code number alone does not carry.
Causes, most likely first on this cooktop
- A momentary supply disturbance — First, because it explains the documented remedy exactly: a brownout, a surge or a brief interruption leaves the board in a state it cannot leave on its own.
- An internal communication hiccup between boards — Second: these appliances run more than one board, and a message lost between them latches rather than retries.
- A connector that is marginal rather than broken — Third: a connection that works most of the time produces a code that clears on a reset and returns days later.
Check in this order, and why
- Do the reset properly, at the breaker — Cutting power at the breaker is not the same as switching the appliance off at its panel, and only the first removes power from the board.
- Count how long it stays away — Minutes, days or weeks — that interval is the most useful thing an owner can record.
- Note what else is on the circuit — A repeat code on a circuit shared with a heavy motor load is worth mentioning.
What an owner can safely check
- Switch the breaker off for about a minute — switch the cooktop off at its breaker. A minute is long enough for the boards to lose their stored state.
About 5 min
- Keep a short log of when the code appears — Date, what the cooktop was doing, and how long it had been running. Two entries make a pattern; one does not.
About 5 min
- Clear the area around the ${A} before anyone visits — Access is charged for like anything else, and a technician who cannot reach the back of the appliance cannot test it.
About 15 min
- STOP HERE — do not reset repeatedly — Cycling power at a fault that keeps returning tells you nothing new and stresses the supply side.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off. An induction surface leaves the pan hot even where the glass beneath reads cool, so treat the cooking area as hot until you have checked it, and keep the residual-heat indication in view while you work.
When to call a technician
Call once the code returns after a proper breaker reset, and call rather than repeat the cycle if it now returns within minutes. A technician will want the interval between returns, what else shares the circuit, and what the cooktop was doing each time — collect those and the visit is much shorter.
Nearest Jenn-Air cooktop codes
What this page does not cover
This page reads E91 for Jenn-Air cooktops in general, from the manufacturer's shared code index. A code can be documented differently for one family, so where a model-line page exists for your unit it is the more specific answer and is linked below. Not here: wiring colours, connector positions and part numbers, which differ by family.
Links: - [Jenn Air Cooktop Error Codes](/blog/jenn-air-cooktop-error-codes)
Where to go next
Lead Appliance Repair Technician · 12 years experience
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