Thermador induction range
showing U400
U400 is another Thermador code for supply voltage outside the normal range.
Mon–Sat, 8am–8pm
- Controls and communication
- Knobs, switches and controls
- Source: Thermador
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What U400
actually means.
U400 is another Thermador code for supply voltage outside the normal range. Thermador treats it the same way as E9000.
Thermador range display
What to do when U400 shows on the rangeKind of codeControls and communication
The display, the main board or the induction power board lost contact with one another, or one of them failed its own self-check. A power dip, a loose cable or moisture from a boil-over is ruled out before a board is replaced, and a range that keeps heating while this code shows is switched off at the breaker.
Usually leads toKnobs, switches and controls
Knobs that spin or crack, touch keys that do nothing, blank displays, clocks that reset and control boards that switch the wrong thing.
Shows up asRange Keeps Tripping the Breaker
The range breaker trips when you switch on an element, the oven or self-clean, or it trips by itself with the range idle.
MakeThermador
A luxury BSH brand selling Pro Harmony and Pro Grand ranges in gas, dual-fuel and induction versions.
SourceThermador "Ranges - Error Codes" support page
U400 sits on Thermador's range code page under induction, which covers its induction ranges.
Before you book,
in this order.
Each step comes from Thermador's own guidance for U400 on its ranges. Follow it to the end: the last card says whether this is a visit.
Turn the range off at the breaker.
Have the supply measured; book a visit if the voltage is fine.
Still there?
It usually turns into knobs, switches and controls. Book with the code and the model number.
What not to do
U400 is not a zone or pan message.
What you may
notice with it.
The range problems U400 tends to arrive with. Answer these at the range before anyone is booked.
All problems
Range Keeps Tripping the Breaker
6 causes, cheapest first
Where U400 usually leads
Knobs, switches and controls.
Thermador
ranges.
A luxury BSH brand selling Pro Harmony and Pro Grand ranges in gas, dual-fuel and induction versions.
Thermador range repair
Gas range
Open flames on top and a gas-fired oven below, all fed by one supply line behind the range and lit by igniters rather than a match.
Dual-fuel range
Gas burners on top and an electric oven below, the combination most professional-style ranges use, needing both a gas line and a 240-volt circuit.
Induction range
A glass top that heats the pan itself through copper coils and power boards, over an electric oven, with electronics doing almost all the work.
In Thermador's own words
The supply voltage is incorrect.
Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. U400 sits on Thermador's range code page under induction, which covers its induction ranges.
Thermador U400 range repair,
where we come out.
The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered.
All service areasTampa BayFL · 31 areas
Miami / South FloridaFL · 47 areas
New York MetroNY · 75 areas
HoustonTX · 36 areas
ChicagoIL · 50 areas
Los AngelesCA · 95 areas
San DiegoCA · 31 areas
Questions
about U400.
Can I clear U400 myself?
Why does my Thermador show U400 only in the evening?
Should I keep cooking on a Thermador that shows U400?
Back to your everyday
Still showing U400?
Book with the code exactly as it appears, the full model number, and whether you notice any smell of gas or scorching — with a code, that is where the diagnosis begins.