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Error code reference

Thermador Cooktop Error Code E0142

Left ADB error checking induction module component: A/D current converter

Thermador codesThermador cooktop codes

Left ADB error checking induction module component: A/D current converter — error measuring the current through the inductors.

First step from the service manual

Replace the left relay board (ADB).

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

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What E0142 means on a Thermador cooktop

Error code E0142 on a Thermador induction cooktop indicates a fault within the left ADB (Analog Distribution Board) related to the A/D current converter circuit. The ADB is responsible for monitoring and regulating power delivery to the induction coils beneath the cooking surface. The analog-to-digital converter within this module continuously samples current flowing through the inductors and translates those readings into digital signals that the control system uses to maintain precise power output. When the A/D converter fails to measure current accurately, the system flags E0142 and disables the affected induction zone to prevent unsafe operation.

The most likely source of this fault is an internal failure within the left relay board (ADB) itself. The A/D conversion circuitry relies on stable reference voltages and properly functioning sensing components. A degraded current sensing resistor, a failed op-amp, or corrupted signal processing within the ADB can all produce inaccurate current readings that trigger this error. Because the ADB integrates multiple functions including relay switching and signal conditioning, a fault in any part of the current measurement path will generate this code.

The primary recommended diagnostic action is replacement of the left relay board (ADB). Before ordering parts, technicians should verify that the wiring harness connections between the ADB and the main control board are secure and free of corrosion or heat damage, since a loose or degraded connector can introduce signal noise that mimics an internal ADB failure. If connections are intact and the error persists after reseating, board replacement is the appropriate next step.

Source: manufacturer service documentation.

Common causes of E0142

  1. 01

    Failed left ADB (relay board) internal circuitry

    Part replacement

    The A/D current converter circuit within the left ADB has failed or is producing out-of-range readings. This is the most common root cause and replacing the left relay board is the primary recommended repair.

  2. 02

    Loose or corroded wiring harness connector

    Wiring / connection

    A poor connection between the ADB and the main control board can introduce signal noise that causes the A/D converter to read incorrect current values. Inspect and reseat all connectors to the left ADB before replacing the board.

  3. 03

    Heat-damaged ADB board traces or components

    Part replacement

    High operating temperatures near the induction coils can degrade solder joints or components on the ADB over time, causing intermittent or permanent current measurement failures. Visually inspect the board for discoloration, burnt spots, or cracked solder joints.

  4. 04

    Inductor coil short or overload condition

    Part replacement

    A partial short in the left induction coil can drive abnormal current levels that exceed the A/D converter's measurable range, triggering the fault. Testing coil resistance may reveal an out-of-spec winding before condemning the ADB.

  5. 05

    Main control board communication fault

    Part replacement

    If the main control board is not properly communicating with the ADB, it may misinterpret or fail to receive current sensor data, generating E0142. This is less common but should be considered if ADB replacement does not resolve the error.

See the test procedure for each cause

Frequently asked questions about E0142

What does E0142 mean on a Thermador cooktop?
E0142 indicates that the left ADB (Analog Distribution Board) has detected an error in its A/D current converter circuit, meaning it cannot accurately measure the current flowing through the left induction coils. The cooktop disables the affected zone when this fault is present to prevent uncontrolled power delivery. The primary fix is replacement of the left relay board.
Can I fix E0142 myself, or do I need a professional technician?
Replacing the left ADB relay board requires working inside the cooktop with components that can carry high voltages. While an experienced DIYer comfortable with appliance repair may be able to complete the board replacement, most homeowners should hire a certified appliance technician. Disconnecting power at the breaker before any disassembly is essential.
Is it safe to use my Thermador cooktop while E0142 is displayed?
No. When E0142 is active, the cooktop's ability to regulate power to the left induction zone is compromised. Continuing to use the affected zone creates a risk of uncontrolled heating or electrical damage. The right-side zones may still function, but the left side should remain unused until the fault is repaired.
Will resetting the cooktop clear the E0142 error code?
A power reset by switching off the circuit breaker for 30 seconds and restoring power may temporarily clear the display, but the error will return if the underlying ADB fault is still present. A reset does not repair the A/D current converter circuit, so the code should be treated as an active hardware fault requiring board diagnosis or replacement.
How much does it cost to repair a Thermador cooktop showing E0142?
Repair costs vary depending on parts pricing and local labor rates. The left ADB relay board typically falls in the range of $150 to $400 for the part alone, and professional labor to diagnose and replace it can add another $100 to $250. Total repair costs commonly range from $250 to $650, though prices differ by region and service provider.

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