Will this page tell a technician which board to replace for E21?

In a basement kitchenette, a fish pan was in play before guests sat down; keep E21 with this range rating plate. E21 stays display text on this range; it is not a spare-part name.

Should I keep running this range while E21 is on the control?

In a tasting kitchen, a tea kettle was in play before guests sat down; keep E21 with this range rating plate. E21 stays display text on this range; it is not a spare-part name.

Does E21 name the same repair on every La Cornue range?

In a courtyard, a tea kettle was in play before guests sat down; keep E21 with this range rating plate. E21 stays display text on this range; it is not a spare-part name.

What should I do first if E21 appears during cooking or a cycle?

In a rooftop kitchen, a roasting pan was in play before guests sat down; keep E21 with this range rating plate. E21 stays display text on this range; it is not a spare-part name.

La Cornue Range E21 Error Code

Use this listing to prepare a range service request around E21, not to name an internal component. In a pool cabana, a wok ring was in play before guests sat down; keep E21 with this range rating plate.

Book a Repair (310) 570-2050

Reviewed by Elena Voss · Last reviewed September 5, 2026

Written by Elena Voss Published September 5, 2026 Technically reviewed September 5, 2026

Error code E21

Appliance Range

Quick answer

E21 on this range is a clue for diagnosis, not a spare-parts list. In a mudroom kitchen, a griddle bridge was in play before guests sat down; keep E21 with this range rating plate.

Model compatibility: La Cornue reuses codes across series and model years, so E21 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.

Plain language

What this code means

If you opened this page because a La Cornue range presented E21, stay with facts. In a rental suite, a griddle bridge was in play before guests sat down; keep E21 with this range rating plate. Say if the door was open, closed, or being used as a shelf. In a outdoor kitchen, a wok ring was in play during a long braise; keep E21 with this range rating plate. In a basement kitchenette, a griddle bridge was in play after a power blink; keep E21 with this range rating plate. In a carriage house, a stockpot was in play mid-sear; keep E21 with this range rating plate.

Signs

Symptoms you may notice

Note whether a surface burner, the oven cavity, or both were in use. In a in-law kitchen, a Dutch oven was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Record whether ignition, simmer, or bake heat had already started. In a penthouse, a Dutch oven was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Note whether a surface burner, the oven cavity, or both were in use. In a carriage house, a fish pan was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Record whether ignition, simmer, or bake heat had already started. In a pool cabana, a fish pan was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Note whether a surface burner, the oven cavity, or both were in use. In a mudroom kitchen, a tea kettle was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Why it happens

Possible causes

Write E21 exactly as the range showed it, including extra icons. In a island, a tea kettle was in play after a power blink; keep E21 with this range rating plate

Add the rating-plate model from this range. In a studio, a roasting pan was in play after a power blink; keep E21 with this range rating plate

Say if the door was open, closed, or being used as a shelf. In a show kitchen, a simmer plate was in play after a power blink; keep E21 with this range rating plate

In a terrace, a simmer plate was in play after a power blink; keep E21 with this range rating plate

Keep a photo of the control with your notes. In a in-law kitchen, a wok ring was in play after a power blink; keep E21 with this range rating plate

Before you call

Safe checks you can make

These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.

Use only a manufacturer-approved restart from the booklet, if one exists. In a basement kitchenette, a fish pan was in play after a power blink; keep E21 with this range rating plate

If it is safe, turn the knobs to off and leave the range to cool. In a tasting kitchen, a tea kettle was in play after a power blink; keep E21 with this range rating plate

Do not keep striking a burner that will not light. In a courtyard, a tea kettle was in play after a power blink; keep E21 with this range rating plate

Confirm the control still shows the same characters after it cools. In a rooftop kitchen, a roasting pan was in play after a power blink; keep E21 with this range rating plate

Safety warning

Important safety warning

Important safety warning.

User controls only; no disassembly and no jumper wires. In a outdoor kitchen, a griddle bridge was in play after a power blink; keep E21 with this range rating plate. Stop if you see flame where it does not belong, or a burner that will not shut off. If you smell gas, do not operate switches; leave and contact the gas provider and a qualified technician. If you see smoke, sparks, or a burning smell, stop.

Please avoid

What not to attempt

Do not force a locked door or a jammed control while the range is hot. Do not keep operating burners or oven modes if you smell gas. In a mudroom kitchen, a Dutch oven was in play before guests sat down; keep E21 with this range rating plate

Do not open internal panels or touch high-voltage terminals. In a rental suite, a Dutch oven was in play before guests sat down; keep E21 with this range rating plate

Do not bypass door locks, safety switches, or interlocks. In a breakfast bar, a fish pan was in play before guests sat down; keep E21 with this range rating plate

Do not keep running the range through a program that immediately fails. In a butler pantry, a fish pan was in play before guests sat down; keep E21 with this range rating plate

Get help

When to call a technician

Book a diagnosis

Book range service when E21 returns, when the appliance will not complete a normal program, or when any stop condition above is present. In a outdoor kitchen, a wok ring was in play during a long braise; keep E21 with this range rating plate.

FAQ

Frequently asked questions

References

Sources & references

Use the documentation supplied with this La Cornue range. In a mudroom kitchen, a Dutch oven was in play mid-sear; keep E21 with this range rating plate.

About the author

Elena Voss

Independent content specialist

Elena Voss is the content specialist behind La Cornue appliance service guides. Elena researches common La Cornue appliance faults, translates technical service information into plain language, and works…

Areas of expertise

Château® ranges
CornuFé® ranges
Château® ranges
Ventilation hoods
Ovens & cooktops
Error-code diagnostics

Editorial responsibilities

Writes appliance guides and error-code explanations, coordinates technical review with experienced technicians, and updates content when guidance or products change.

Profile last reviewed September 5, 2026

Book a repair

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Phone (310) 570-2050

Email Lacornuelosangeles@gmail.com

Hours Mon–Sat: 8:00 AM – 7:00 PM

Service area Serving Los Angeles County and Orange County.

Response time Appointment timing depends on location, route capacity, appliance type, and parts needs.

La Cornue Range E21 Error Code

Error code overview

What this code means

Symptoms you may notice

Note whether a surface burner, the oven cavity, or both were in use. In a in-law kitchen, a Dutch oven was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Record whether ignition, simmer, or bake heat had already started. In a penthouse, a Dutch oven was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Note whether a surface burner, the oven cavity, or both were in use. In a carriage house, a fish pan was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Record whether ignition, simmer, or bake heat had already started. In a pool cabana, a fish pan was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Note whether a surface burner, the oven cavity, or both were in use. In a mudroom kitchen, a tea kettle was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Possible causes

Write E21 exactly as the range showed it, including extra icons. In a island, a tea kettle was in play after a power blink; keep E21 with this range rating plate

Add the rating-plate model from this range. In a studio, a roasting pan was in play after a power blink; keep E21 with this range rating plate

Say if the door was open, closed, or being used as a shelf. In a show kitchen, a simmer plate was in play after a power blink; keep E21 with this range rating plate

In a terrace, a simmer plate was in play after a power blink; keep E21 with this range rating plate

Keep a photo of the control with your notes. In a in-law kitchen, a wok ring was in play after a power blink; keep E21 with this range rating plate

Safe checks you can make

Use only a manufacturer-approved restart from the booklet, if one exists. In a basement kitchenette, a fish pan was in play after a power blink; keep E21 with this range rating plate

If it is safe, turn the knobs to off and leave the range to cool. In a tasting kitchen, a tea kettle was in play after a power blink; keep E21 with this range rating plate

Do not keep striking a burner that will not light. In a courtyard, a tea kettle was in play after a power blink; keep E21 with this range rating plate

Confirm the control still shows the same characters after it cools. In a rooftop kitchen, a roasting pan was in play after a power blink; keep E21 with this range rating plate

Important safety warning

Important safety warning.

What not to attempt

Do not force a locked door or a jammed control while the range is hot. Do not keep operating burners or oven modes if you smell gas. In a mudroom kitchen, a Dutch oven was in play before guests sat down; keep E21 with this range rating plate

Do not open internal panels or touch high-voltage terminals. In a rental suite, a Dutch oven was in play before guests sat down; keep E21 with this range rating plate

Do not bypass door locks, safety switches, or interlocks. In a breakfast bar, a fish pan was in play before guests sat down; keep E21 with this range rating plate

Do not keep running the range through a program that immediately fails. In a butler pantry, a fish pan was in play before guests sat down; keep E21 with this range rating plate

When to call a technician

Book a diagnosis

Seeing this code on your La Cornue appliance?

Frequently asked questions

Sources & references

Ready to restore your La Cornue appliance?

Tell us what’s wrong — we’ll take it from there

La Cornue Range E21 Error Code

Note whether a surface burner, the oven cavity, or both were in use. In a in-law kitchen, a Dutch oven was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Record whether ignition, simmer, or bake heat had already started. In a penthouse, a Dutch oven was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Note whether a surface burner, the oven cavity, or both were in use. In a carriage house, a fish pan was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Record whether ignition, simmer, or bake heat had already started. In a pool cabana, a fish pan was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Note whether a surface burner, the oven cavity, or both were in use. In a mudroom kitchen, a tea kettle was in play late on a weeknight; keep E21 with this range rating plate while E21 is on the range

Write E21 exactly as the range showed it, including extra icons. In a island, a tea kettle was in play after a power blink; keep E21 with this range rating plate

Add the rating-plate model from this range. In a studio, a roasting pan was in play after a power blink; keep E21 with this range rating plate

Say if the door was open, closed, or being used as a shelf. In a show kitchen, a simmer plate was in play after a power blink; keep E21 with this range rating plate

In a terrace, a simmer plate was in play after a power blink; keep E21 with this range rating plate

Keep a photo of the control with your notes. In a in-law kitchen, a wok ring was in play after a power blink; keep E21 with this range rating plate

Use only a manufacturer-approved restart from the booklet, if one exists. In a basement kitchenette, a fish pan was in play after a power blink; keep E21 with this range rating plate

If it is safe, turn the knobs to off and leave the range to cool. In a tasting kitchen, a tea kettle was in play after a power blink; keep E21 with this range rating plate

Do not keep striking a burner that will not light. In a courtyard, a tea kettle was in play after a power blink; keep E21 with this range rating plate

Confirm the control still shows the same characters after it cools. In a rooftop kitchen, a roasting pan was in play after a power blink; keep E21 with this range rating plate

Important safety warning.

Do not force a locked door or a jammed control while the range is hot. Do not keep operating burners or oven modes if you smell gas. In a mudroom kitchen, a Dutch oven was in play before guests sat down; keep E21 with this range rating plate

Do not open internal panels or touch high-voltage terminals. In a rental suite, a Dutch oven was in play before guests sat down; keep E21 with this range rating plate

Do not bypass door locks, safety switches, or interlocks. In a breakfast bar, a fish pan was in play before guests sat down; keep E21 with this range rating plate

Do not keep running the range through a program that immediately fails. In a butler pantry, a fish pan was in play before guests sat down; keep E21 with this range rating plate

Book a diagnosis

Seeing this code on your La Cornue appliance?

Range Repair

La Cornue Range E22 Error Code

La Cornue Range E23 Error Code

La Cornue Range E24 Error Code

01 Will this page tell a technician which board to replace for E21?

02 Should I keep running this range while E21 is on the control?

03 Does E21 name the same repair on every La Cornue range?

04 What should I do first if E21 appears during cooking or a cycle?

Ready to restore your La Cornue appliance?

Tell us what’s wrong — we’ll take it from there