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Error code reference

Thermador Cooktop Error Code E0513

DBUS2 communication failure between the modules

Thermador codesThermador cooktop codes

DBUS2 communication failure between the modules — the DBUS2 communication bus is not working between one or more modules.

First step from the service manual

See Checklist E0513 flowchart; check continuity between 5V, STB, GND and Dbus2 pins between TFT and filter board-power supply.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What E0513 means on a Thermador cooktop

Error code E0513 on a Thermador cooktop indicates a DBUS2 communication failure between internal control modules. DBUS2 is a digital communication bus that carries data signals between the cooktop's TFT display module and the filter board/power supply module. When this bus is not functioning correctly, the modules cannot exchange the control and status signals they require to operate in coordination, which causes the cooktop to halt normal operation and display this fault code.

The DBUS2 bus relies on four key signal lines: 5V power, STB (standby), GND (ground), and the DBUS2 data line itself. A failure on any one of these lines between the TFT module and the filter board/power supply is sufficient to trigger E0513. Common physical causes include broken or intermittent wiring in the harness connecting these boards, a loose or corroded connector at either end, or a damaged pin at one of the connection points. Internal failures within either the TFT board or the filter board/power supply can also disrupt communication if a component on one of those boards is no longer driving or receiving the bus signal properly.

Diagnosis begins with the E0513 flowchart procedure, which directs the technician to check continuity across the 5V, STB, GND, and DBUS2 pins between the TFT module and the filter board/power supply. Any break in continuity, or a short to ground or adjacent lines, pinpoints the fault location. If wiring and connectors check out, one or both of the connected boards may need replacement.

Source: manufacturer service documentation.

Common causes of E0513

  1. 01

    Loose or disconnected wiring harness connector

    Wiring / connection

    The connector linking the TFT display module to the filter board/power supply may have come loose, partially unseated, or vibrated free. Inspect both ends of the harness for secure seating and confirm each pin is fully engaged.

  2. 02

    Broken or open wire in the DBUS2 harness

    Part replacement

    One or more of the four signal wires (5V, STB, GND, DBUS2) may have a break in continuity due to chafing, pinching, or heat damage. Use a multimeter to verify continuity on each line between the TFT and filter board connectors.

  3. 03

    Corroded or damaged connector pins

    Part replacement

    Moisture or heat exposure can corrode the pins at either connector, increasing resistance and disrupting the low-voltage DBUS2 signal. Visually inspect pins for discoloration, pitting, or bent contacts.

  4. 04

    Failed TFT display board

    Part replacement

    If wiring and connectors test good, the TFT module itself may have failed internally and is no longer able to drive or receive signals on the DBUS2 bus. Board replacement is required after ruling out all wiring faults.

  5. 05

    Failed filter board or power supply module

    Part replacement

    The filter board/power supply module on the other end of the DBUS2 bus may have an internal component failure that prevents proper communication. This is typically confirmed after the wiring, connectors, and TFT board have been evaluated.

See the test procedure for each cause

Frequently asked questions about E0513

What does E0513 mean on a Thermador cooktop?
E0513 indicates a DBUS2 communication bus failure between the cooktop's internal control modules, specifically between the TFT display module and the filter board/power supply. The four signal lines involved are 5V, STB, GND, and DBUS2. When any of these lines loses continuity or a module fails internally, the boards can no longer communicate and the cooktop displays this fault code. The cooktop will not operate normally until the communication fault is resolved.
Can I fix E0513 on my Thermador cooktop myself?
A knowledgeable DIYer can inspect and reseat wiring harness connectors between the TFT module and the filter board/power supply, which sometimes resolves the fault if a connector had simply come loose. Checking wire continuity with a multimeter across the 5V, STB, GND, and DBUS2 pins is also within reach for someone comfortable with basic electrical testing. However, if a control board needs replacement, the repair becomes more involved and working inside a cooktop carries electrical risk, so a qualified technician is recommended for board-level repairs.
Is it safe to use my Thermador cooktop while E0513 is displayed?
You should not attempt to operate the cooktop while E0513 is active. A communication failure between the control modules means the cooktop cannot properly coordinate burner control and safety functions. Continued use without addressing the fault could result in unpredictable behavior. Disconnect power to the unit until the fault has been diagnosed and repaired.
Will resetting my Thermador cooktop clear the E0513 error?
A power reset by disconnecting the cooktop from its power source for several minutes may temporarily clear the displayed code, but the fault will return if the underlying communication problem has not been fixed. E0513 is caused by a hardware issue in the wiring or control boards, not a software glitch, so a reset alone is not a repair. The DBUS2 signal path needs to be physically inspected and confirmed functional before the fault is genuinely resolved.
How much does it cost to repair a Thermador cooktop showing E0513?
Repair costs vary depending on the root cause. If the fix is a reseated connector or a replacement wiring harness, costs may range from roughly $100 to $250 including labor. If a control board such as the TFT module or the filter board/power supply requires replacement, parts alone can range from $150 to $450 or more, with labor added on top. Getting a diagnostic estimate from a Thermador-authorized technician before authorizing parts is recommended.

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