mypros+
Error code reference

Miele Refrigerator Error Code F120

Voltage below 95VAC (not visible to customer).

Miele codesMiele refrigerator codes

Voltage below 95VAC (not visible to customer).

MyPros+ Max

Get the full diagnostic procedure for F120.

  • 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
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What F120 means on a Miele refrigerator

The F120 error code on a Miele refrigerator indicates that the incoming AC supply voltage has dropped below 95 volts AC. This is a protective diagnostic flag generated by the refrigerator's control board, which continuously monitors the incoming mains voltage. Because the refrigerator's compressor, fans, and control electronics are designed to operate within a specific voltage range, sustained low voltage conditions can prevent proper operation and may cause damage to electrical components over time. This code is flagged internally and is not displayed to the end user under normal circumstances, making it a service-level diagnostic.

The root cause of F120 is almost always found in the external power supply rather than within the refrigerator itself. Low voltage at the outlet can result from utility supply issues, an overloaded household circuit, a failing breaker, undersized wiring, or a poor connection somewhere between the main panel and the outlet. In some cases, a shared circuit with high-draw appliances such as microwaves or dishwashers can cause momentary voltage sags that trigger this code.

Diagnosing F120 requires measuring the actual AC voltage at the wall outlet supplying the refrigerator using a reliable multimeter or plug-in voltage meter. If the outlet reads below 95VAC consistently or during compressor startup, the issue lies with the building's electrical supply and must be addressed before the refrigerator can operate reliably. A licensed electrician may be needed to assess the circuit, wiring, or panel connections.

Source: manufacturer service documentation.

Common causes of F120

  1. 01

    Low utility or household supply voltage

    Wiring / connection

    The overall voltage supplied by the utility or distributed through the home's electrical panel may be sagging below acceptable levels. Measure the outlet voltage with a multimeter to confirm readings below 95VAC.

  2. 02

    Overloaded or undersized circuit

    Wiring / connection

    If the refrigerator shares a circuit with other high-draw appliances, the combined load can pull voltage below 95VAC. Checking which devices share the circuit and reducing the load can confirm this cause.

  3. 03

    Loose or corroded wiring connection

    Part replacement

    A loose connection at the wall outlet, junction box, or breaker panel can create resistance that drops the effective voltage at the appliance. Inspecting and tightening connections at the outlet and panel may resolve the issue.

  4. 04

    Failing or weak circuit breaker

    Part replacement

    A breaker that is beginning to fail may allow current to pass but with increased resistance, resulting in reduced voltage at the outlet. A licensed electrician can test the breaker under load to determine if it needs replacement.

  5. 05

    Faulty or degraded wall outlet

    Part replacement

    The outlet itself may have worn contacts that create a high-resistance connection, reducing available voltage. Replacing the outlet and measuring voltage afterward will confirm if this was the source.

See the test procedure for each cause

Frequently asked questions about F120

What does F120 mean on a Miele refrigerator?
F120 is an internal diagnostic code indicating that the refrigerator's control board has detected incoming AC supply voltage below 95 volts AC. This code is not shown to the end user and is only visible during service-level diagnostics. It signals a problem with the power supply rather than a failure of the refrigerator's internal components. Correcting the voltage at the source is required to resolve it.
Can I fix the F120 error on my Miele refrigerator myself?
If you are comfortable using a multimeter, you can measure the voltage at the wall outlet to confirm whether the supply is below 95VAC. If the outlet is the problem, replacing it is a straightforward repair for someone familiar with basic electrical work. However, if the issue is in the circuit breaker, panel wiring, or utility supply, a licensed electrician should be contacted to perform the repairs safely.
Is the F120 error code on a Miele refrigerator a safety concern?
Sustained low voltage can pose indirect risks, as it can cause the compressor and other motors to draw higher current than normal, potentially leading to overheating over time. Food safety is also a concern if the refrigerator cannot maintain proper temperatures due to power issues. Addressing the underlying voltage problem promptly helps protect both the appliance and its contents.
How much will it cost to fix the F120 error on a Miele refrigerator?
If the fix is simply replacing a faulty wall outlet, costs are typically in the range of $75 to $200 including labor. If the issue requires circuit rewiring or a breaker replacement, costs can range from $150 to $500 or more depending on the scope of work. A utility-side voltage problem may require coordination with the power company and could involve little to no direct cost depending on the provider's policies.
Will resetting the Miele refrigerator clear the F120 error code?
Resetting the refrigerator by cycling power may temporarily clear the stored code, but if the supply voltage remains below 95VAC, the code will return as the control board continues to detect the low voltage condition. A reset does not address the underlying electrical issue. The error will only remain resolved once the incoming voltage is consistently above the minimum threshold.

Related Miele refrigerator codes

All Miele refrigerator codes
View all 68 Miele refrigerator codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass