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Error code · Cooktop

Older Thermador Induction Cooktop “E” Plus Number Display (Er): Electronic System Error on CIT365GB, CIT304GB and CIT365DS Models

If the display on an older Thermador induction cooktop shows the letter E followed by a string of numbers, the manual says the electronic system has a problem. The manual lists CIT365GB/GM, CIT304GB/GM, CIS365GB, CIT365DS and…

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Code
E + series of numbers (Er)
Appliance
Cooktop
Brand
Thermador
Warranty
30-day workmanship

What E + series of numbers (Er) means

If the display on an older Thermador induction cooktop shows the letter E followed by a string of numbers, the manual says the electronic system has a problem. The manual lists CIT365GB/GM, CIT304GB/GM, CIS365GB, CIT365DS and CIT304E as the older units using this wording. Turn the cooktop off and on again at the fuse or breaker, and call for help if the same display returns.

Usual causes of E + series of numbers (Er)

  • Temporary electronic glitch cleared by a power cycle
  • Control board or electronic module failing
  • Power supply to the cooktop unstable
  • Wiring or connection problem at the cooktop
✓ A safe check worth trying

1. Turn every zone off. 2. Switch the cooktop off at the fuse or circuit breaker and wait a few seconds. 3. Switch it back on and see whether the display is clear. 4. If the same E and numbers appear again, stop using the cooktop, write down the full number, and call for service.

! Why you should stop here
  • Board-level problems need meters and the exact code sequence read on site.
  • Repeated electronic errors can stress other parts if the cooktop is kept running.
  • We quote in writing, and confirm parts by model number for older units.
Taking off a panel yourself does not by default void a manufacturer warranty, yet it can lead to accidental damage, and some manufacturers attach their own service terms. Read your warranty paperwork, or ask us, before you decide.
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More Cooktop codes

F1Thermador Induction Cooktop F1 / F6 Error Code c2 / c3Legacy Thermador Cooktop c2 / c3 on CIT365DS and CIT304E Induction Units: Element Overheated, Deactivated F9Thermador Induction Cooktop F9 Error Code (Flex Zone) U400Older Thermador Cooktop U400 on CIT365DS and CIT304E Induction Models: Cooktop Connected Incorrectly U400Thermador Cooktop U400 Voltage Error Code E7015Thermador Cooktop E7015 on Current Masterpiece and Freedom Induction Models: Electronics Overheated E8207Thermador Cooktop E8207, Current Masterpiece and Freedom Induction: Zone Shut Off, Electronics Hot E8208Thermador Cooktop E8208 on Current Induction Models (Masterpiece/Freedom): Overheated Electronics
E + series of numbers (Er)E + series of numbers (Er) questions
Why does the display show so many different numbers?

The manual only says an E and a series of numbers means an electronic system problem. Those digits tell a technician what the board saw, so write them down before you reset.

Will resetting at the breaker fix it?

Sometimes. The manual's first step is to turn the cooktop off and on at the fuse or breaker. If the same display appears again after the reset, the problem is real and needs service.

Is this the same as the E codes on new Thermador cooktops?

Not necessarily. Current cooktops list specific E numbers with their own wording. This older entry is a general electronic-system message for the models named in the manual.

Request service

Is E + series of numbers (Er) still showing?

Our technician checks it in your home and hands you a written price before touching anything.

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