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Error code · Dishwasher

Thermador Dishwasher E27: Supply Voltage Is Too Low

The dishwasher refuses to run properly, or stops shortly after starting, and the display shows E27. Thermador documents this code as supply voltage that sits too low. Rather than something inside the machine breaking, the control…

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Code
E27
Appliance
Dishwasher
Brand
Thermador
Warranty
30-day workmanship

What E27 means

The dishwasher refuses to run properly, or stops shortly after starting, and the display shows E27. Thermador documents this code as supply voltage that sits too low. Rather than something inside the machine breaking, the control is reporting that the electricity arriving at it is below what it needs to operate. Fixing it therefore starts with the electrical supply and not with replacing dishwasher parts.

Usual causes of E27

  • A problem with the home's electrical supply
  • A circuit that is undersized or overloaded
✓ A safe check worth trying

1. Do not open any panel or touch wiring. 2. Check whether other lights or appliances on the same circuit dim or misbehave when the dishwasher starts. 3. Unplug or switch off anything else sharing that circuit and try again. 4. If E27 stays, ask a licensed electrician to measure the voltage and inspect the circuit.

! Why you should stop here
  • Low voltage is an electrical-supply matter outside the dishwasher, and it needs an electrician's diagnosis.
  • Replacing parts in a dishwasher that is being fed low voltage will not remove the cause.
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 Dishwasher codes

E3100Thermador Dishwasher E3100 Trips Leak Protection Over Water in the Base Tray E3200Thermador Dishwasher E3200: Fill Falls Short of the Level the Board Wants E3300Thermador Dishwasher E3300: Intake Blocked or Absent E3400Thermador Dishwasher E3400 and Water That Keeps Running In E6102Thermador Dishwasher E6102, Draining Trouble With Easy Culprits E6103Thermador Dishwasher E6103 When Nothing Drains After Installation E9240Thermador Dishwasher E9240: Water Will Not Leave the Tub E9210Thermador Dishwasher E9210 Flags a Bottom Spray Arm That Will Not Turn
E27E27 questions
Might neighboring appliances share the blame?

Yes. A shared circuit that is overloaded can drag the voltage down. It is worth mentioning to your electrician so they look at everything that is connected.

May I keep using the dishwasher meanwhile?

The code is about low supply rather than a safety trip, but a struggling circuit deserves attention. Avoid repeated restarts and have the voltage measured soon.

Will you replace anything for E27?

Only if testing shows the dishwasher itself is to blame. Should the supply turn out to be the cause, we will tell you so and suggest the electrician instead of selling you a repair.

Request service

Is E27 still showing?

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

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