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Error code reference

Thermador Range Error Code F170

Power failure.

Thermador codesThermador range codes

Power failure.

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What F170 means on a Thermador range

The F170 error code on a Thermador range indicates a power failure event. This code is triggered when the control board detects an interruption or abnormality in the incoming electrical supply to the unit. The range's main control board continuously monitors the power supply, and when voltage drops below the acceptable operating threshold or is lost entirely, the board logs this fault and displays the F170 code upon power restoration.

Power failure faults can originate from several points in the electrical circuit. A momentary grid outage, a tripped circuit breaker, a loose or corroded connection at the terminal block, or an issue with the household wiring feeding the range can all trigger this code. Because the control board retains the fault in memory, the error will display even after power has been restored, requiring a manual acknowledgment or reset to clear it.

In some cases, the F170 code may point to a recurring instability in the power supply rather than a single outage event. Voltage fluctuations caused by a failing outlet, a shared high-load circuit, or deteriorating wiring in the home can cause the control board to log repeated power failure faults. If the code returns frequently without an obvious outage, the incoming voltage and wiring connections should be inspected carefully before assuming the control board itself is at fault.

Source: manufacturer service documentation.

Common causes of F170

  1. 01

    Household power outage or interruption

    Wiring / connection

    A brief or extended grid outage is the most frequent trigger for F170. The control board logs the event and displays the fault after power is restored, even if the outage was only momentary.

  2. 02

    Tripped circuit breaker

    Wiring / connection

    A tripped breaker in the home's electrical panel cuts power to the range and triggers the fault. Check the dedicated circuit breaker for the range and reset it if it has tripped.

  3. 03

    Loose or corroded terminal block connections

    Wiring / connection

    The terminal block where the power supply cable connects to the range can develop loose or corroded connections over time, causing intermittent power interruptions that register as F170 faults. Inspect and tighten all connections at the terminal block.

  4. 04

    Faulty or undersized household wiring

    Wiring / connection

    Deteriorating, undersized, or overloaded wiring feeding the range circuit can cause voltage drops that the control board interprets as a power failure. Repeated F170 codes without a known outage suggest this possibility and require inspection by a licensed electrician.

  5. 05

    Defective main control board

    Part replacement

    If wiring and power supply checks are normal and the code persists or appears without any actual power interruption, the main control board itself may be malfunctioning and logging false power failure faults. Replacement of the control board would be required in this scenario.

See the test procedure for each cause

Frequently asked questions about F170

What does F170 mean on a Thermador range?
F170 on a Thermador range indicates that the control board detected a power failure or interruption to the unit. The board stores this fault in memory and displays the code after power is restored. It is essentially the range's way of logging that it lost power at some point. In many cases, a simple reset will clear the code if the underlying power issue has been resolved.
Will resetting the range clear the F170 error code?
Yes, in most cases resetting the range will clear the F170 code if the original power disruption has passed. You can reset the range by turning off the dedicated circuit breaker for 30 seconds and then turning it back on. If the code returns repeatedly, there is likely an ongoing issue with the power supply or wiring that needs to be addressed.
Is it safe to use my Thermador range when it shows F170?
The F170 code itself is a notification of a past power event rather than an indicator of a dangerous component failure. However, you should confirm that the range is operating normally before using it, especially the oven and burners. If the code keeps returning or the range behaves erratically, stop using it and have the electrical supply and unit inspected before continuing.
How much does it cost to fix an F170 error on a Thermador range?
If the cause is simply a power outage or tripped breaker, there is no repair cost. If wiring connections at the terminal block need servicing, a technician visit typically runs in the range of $100 to $250 depending on your area. If a main control board replacement is needed, parts and labor combined can range from $350 to $700 or more. Having an electrician inspect the home wiring circuit may add additional costs.
Why does my Thermador range keep showing F170 even after resetting?
Recurring F170 codes after resetting usually point to an ongoing instability in the power supply rather than a one-time outage. Possible causes include a loose terminal block connection, a weakening circuit breaker, voltage fluctuations from the utility, or deteriorating household wiring. If basic electrical checks at the breaker and terminal block do not resolve the issue, a licensed electrician should evaluate the dedicated circuit feeding the range.

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