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Error code reference

Bosch Range Error Code F190

Power over voltage at power-up

Bosch codesBosch range codes

Power over voltage at power-up — 240V power installed incorrectly (non-faulty condition).

First step from the service manual

Check wiring on input power block; 240V has been applied to L1 and neutral. Look for L2 and neutral being swapped.

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

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What F190 means on a Bosch range

F190 is a power supply fault logged by the Bosch range control board at the moment the unit powers on. The board samples incoming line voltage during its startup sequence and compares it against a defined acceptable range. When it detects voltage above the upper threshold, it sets F190 and typically halts normal operation to protect downstream components, including the control board itself, the oven relay board, and any electronically controlled burner modules.

For homeowners, this code means the range measured too much electrical voltage coming from your home's outlet or circuit at the moment it turned on. Think of it like a surge protector tripping, except the range's own control board caught the problem. This can happen because of a genuine overvoltage condition from the utility, a wiring problem in your home's electrical panel or outlet, or a fault inside the range affecting how the board reads incoming power.

The most common triggers are a high-voltage event from the utility grid, a loose or mis-wired neutral connection at the outlet or panel, or a failing control board that is misreading the supply voltage. Before replacing any parts, verify the actual line voltage at the outlet with a multimeter, since a true overvoltage from the grid requires an electrician, not a range repair.

Source: manufacturer service documentation.

Common causes of F190

  1. 01

    Utility or household overvoltage at the outlet

    Wiring / connection

    If the voltage at the 240V range outlet exceeds approximately 132V per leg, the control board triggers F190 at startup. This can result from a loose neutral at the utility transformer or service panel, which causes one leg of the 240V supply to rise significantly above normal.

  2. 02

    Loose or corroded neutral wire at the outlet or terminal block

    Wiring / connection

    A high-resistance or open neutral connection in the range's wiring circuit causes voltage imbalance between the two hot legs, effectively creating an overvoltage condition that the board detects during power-on sampling. Inspecting and securing the neutral at the outlet, junction box, and range terminal block often resolves this.

  3. 03

    Faulty main control board misreading supply voltage

    Part replacement

    The voltage sensing circuit on the main control board can fail internally, causing it to report an overvoltage condition even when actual line voltage is within spec. If measured outlet voltage is normal and wiring connections are secure, a defective control board is the likely source.

  4. 04

    Power surge event damaging the control board's voltage sensing components

    Part replacement

    A sudden voltage spike from the grid, such as during a storm or utility switching, can damage the sensing components on the control board without destroying the board entirely, leaving it in a state where it permanently reads overvoltage at startup.

See the test procedure for each cause

Frequently asked questions about F190

What does F190 mean on a Bosch range?
F190 means the range's control board detected an overvoltage condition on the incoming power supply at the moment the unit powered on. The board measures line voltage during its startup sequence and shuts down or restricts operation if the voltage reads above its acceptable limit. The problem can originate from the utility, your home's wiring, or a faulty sensing circuit on the control board itself.
Is it safe to use my Bosch range when F190 is displayed?
You should not continue using the range while F190 is active. The code indicates the control board detected excessive voltage, which can damage the board, relay components, and electronically controlled burner modules if the unit keeps running under those conditions. Stop using the range and measure the outlet voltage with a multimeter before attempting to reset or restart it.
How do I fix F190 on a Bosch range?
Start by measuring the voltage at the 240V range outlet with a multimeter. Each leg to neutral should read approximately 120V, and leg-to-leg should read approximately 240V. If voltage is elevated, contact your utility or a licensed electrician to address the supply issue. If voltage is normal, inspect the neutral wire connections at the outlet, junction box, and range terminal block for looseness or corrosion. If connections are solid and voltage is correct, the main control board likely needs replacement.
How much does it cost to repair F190 on a Bosch range?
If the fix is a wiring correction at the outlet or panel, an electrician may charge between $75 and $200 depending on the scope of work. If the main control board needs replacement, the part typically costs $150 to $350 depending on the range model, with labor adding $100 to $200 if you hire a technician. A capable DIY repair person comfortable with appliance disassembly can replace the control board themselves using the model-specific service manual, which reduces cost to the part alone.
Will turning the Bosch range off and back on clear F190?
Cycling power may temporarily clear F190 if the original trigger was a brief voltage spike that has since resolved. However, if the underlying cause, such as a loose neutral or elevated utility voltage, is still present, the code will return at the next power-on cycle. Confirm actual outlet voltage is within spec before relying on a reset as a solution.

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