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Error code reference

Thermador Range Error Code F190

Power over voltage.

Thermador codesThermador range codes

Power over voltage.

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What F190 means on a Thermador range

The F190 error code on a Thermador range indicates a power over voltage condition. This means the control board has detected that the incoming AC line voltage is exceeding the acceptable operating threshold for the appliance. Thermador ranges are designed to operate within a standard voltage range, and when the supply voltage rises above that ceiling, the control system triggers this fault to protect internal electronics and heating components from damage.

Over voltage conditions can originate from the utility supply itself, from wiring issues within the home's electrical panel, or from a failing voltage regulation component within the range's power supply circuit. The control board monitors incoming voltage continuously, and a sustained spike or elevated voltage reading will latch this fault code. This is distinct from a brief transient surge, which may or may not trigger the code depending on duration and severity.

The most practical first step is to verify the actual line voltage at the range's terminal block or receptacle using a multimeter. If the measured voltage is within the normal range for the appliance and the error persists, the control board itself may be misreading the incoming supply, pointing to a faulty main control board. Addressing the root cause of the over voltage condition, whether utility-side or internal, is critical before returning the unit to service.

Source: manufacturer service documentation.

Common causes of F190

  1. 01

    High utility supply voltage

    Wiring / connection

    The incoming voltage from the power company may be running above the acceptable level for the range. Check the voltage at the wall receptacle or terminal block with a multimeter to confirm whether the supply voltage is elevated.

  2. 02

    Faulty main control board

    Part replacement

    If the incoming line voltage tests within a normal range but the F190 code persists, the main control board may be incorrectly sensing or misreporting the voltage level. Replacing the control board would be the next step in this scenario.

  3. 03

    Wiring or connection issues at the terminal block

    Wiring / connection

    Loose, corroded, or improperly terminated wiring at the range's terminal block can cause abnormal voltage readings. Inspect all connections for tightness and signs of arcing or heat damage.

  4. 04

    Electrical panel problems

    Wiring / connection

    A failing circuit breaker or improper neutral connection in the home's electrical panel can create voltage imbalances that push the measured voltage above normal limits. A licensed electrician should inspect the panel if the supply voltage is confirmed to be out of range.

  5. 05

    Power surge event

    Wiring / connection

    A significant voltage surge from a nearby lightning strike or utility switching event can trigger this code and latch it in the control board's memory. Resetting the unit may clear the fault if the surge was temporary and no components were damaged.

See the test procedure for each cause

Frequently asked questions about F190

What does F190 mean on a Thermador range?
The F190 code on a Thermador range indicates that the control board has detected a power over voltage condition, meaning the incoming electrical supply voltage is above the acceptable operating range for the appliance. The range triggers this fault to protect its electronics and heating components from damage caused by excessive voltage. The issue can originate from the utility supply, home wiring, or a faulty control board.
Is it safe to use my Thermador range when the F190 code is displayed?
It is not advisable to continue operating the range while the F190 error is active. An over voltage condition can damage the control board, heating elements, and other internal components over time. Turn the range off and disconnect it from power until the source of the voltage issue has been identified and resolved.
Will resetting my Thermador range clear the F190 error code?
A reset by powering the range off at the circuit breaker for several minutes may clear the F190 code if the over voltage condition was caused by a temporary surge that has since passed. However, if the underlying cause such as elevated utility voltage or a faulty control board is still present, the code will likely return. Always verify the actual line voltage before assuming the problem is resolved.
How do I fix the F190 error on my Thermador range?
Start by measuring the incoming line voltage at the range's receptacle or terminal block using a multimeter. If the voltage is confirmed to be too high, contact your utility provider or a licensed electrician to address the supply issue. If the voltage is within a normal range but the code persists, the main control board may need to be inspected and potentially replaced by a qualified technician.
How much does it cost to repair a Thermador range showing the F190 error?
Repair costs vary depending on the root cause. If the issue is limited to a supply voltage problem corrected at the electrical panel or utility level, electrician service fees could range from $100 to $300 or more. If the main control board requires replacement, parts and labor combined can range from $300 to $700 or higher depending on the specific model and local labor rates.

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