Error code
Thermador connectivity error code H3404
Thermador error code H3404: the manufacturer's own service is not answering. What the code covers, what to check first, and what it does not tell you — on dishwashers and wall ovens & steam ovens and professional ranges and cooktops & rangetops and built-in refrigerators & columns and range hoods & ventilation.
- From $95 diagnostic, credited to the repair
- 59 cities and neighborhoods covered
- OEM parts available on order
- In writing the price, before anything is opened
What we can confirm
Code H3404, from the manufacturer's own documentation
A code is only meaningful together with the generation showing it — the same two digits mean different things across generations.
What it narrows down to
Service unavailable
What you are probably seeing
Diagnostic
From $95, credited to the repair
What it looks like from the kitchen
The symptom this code usually arrives with
A code names the subsystem; the symptom is what sent you to look at the display in the first place. That page says what it usually turns out to be, cheapest cause first.
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Rarely the appliance Appliance will not connect to the app
Pairing that fails, an appliance that shows as offline, or a connection that drops during a software update. Thirty of the published codes on this make are about the connection rather than the machine.
- Pairing fails partway through
- Appliance shows offline in the app
- An update that stopped halfway
In more detail
About Thermador connectivity error code H3404
What this one means
The manufacturer's own service is not answering. It is a code the manufacturer publishes for this appliance, not one we have worked out — and it is decoded here rather than left as three characters on a display.
What the code covers
A published cause names a circuit rather than a component, which is the single most useful thing to know before ordering a part. This one covers:
- The Home Connect service
What to try yourself
- Try again later
Then what
Nothing on this side is broken and nothing on this side will fix it.
This code is published for dishwashers and wall ovens & steam ovens and professional ranges and cooktops & rangetops and built-in refrigerators & columns and range hoods & ventilation. The full list of codes has the rest of them, searchable, including the labels older and newer machines use for the same conditions.
This article is based on:
- Official manufacturer documentation
- Internal repair procedures
- Technician repair history
- Company quality standards