JennAir JMV Code E23: oven never reached pre-heat temperature

What E23 means

Owners of JennAir over-the-range microwave hoods such as the JMV9196CS or the JMV8000 series see E23 when the oven fails to reach its pre-heat temperature within thirty minutes. In practice this appears during convection or heated cooking, where the cavity should warm up. The heater, the appliance control board and the wiring between them are the areas the official guidance points to.

Common causes of E23

Heater element is weak or not heating
Wiring to the heater has a loose or burned connection
Appliance control board is not sending power to the heater

✓ One safe check you can try

1. Cancel the cycle and let the oven cool with the door open. 2. Confirm the circuit breaker for the microwave is on and not tripped. 3. Check that the vent openings are clear. 4. Try the preheat once more with a clean, empty cavity and nothing on the turntable. 5. If E23 returns after another thirty minutes, stop using that mode and call us.

! Why to stop there

Heater and control checks require an opened unit and live meter readings.
Repeated thirty-minute preheat attempts waste electricity and heat the housing above your cooktop.
The cause may be the heater, a wire, or the board, and only measurements tell which one.
Our price is written down before work begins, with a 30-day workmanship warranty.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Microwave codes

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E23E23 questions

Why does E23 only show up in heated modes?

The message is about reaching pre-heat temperature in thirty minutes, which only matters when the heater is supposed to run. Plain microwave power uses a different path, so it can keep working while E23 is active.

Should I leave the oven preheating to see if it recovers?

No. If it could not get there in thirty minutes, more time will not help. Cancel, cool it down and avoid repeating the attempt until the heating system is checked.

Does a tripped breaker cause E23?

A power drop could slow heating, but a clean breaker trip usually ends the display altogether. Resetting a tripped breaker once is fine. If E23 comes back with the breaker on, the heating parts need a look.