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Error code reference

GE Range Error Code ER 25

MTwisT Control fault

GE codesGE range codes

MTwisT Control fault: False connection mains.

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What ER 25 means on a GE range

ER 25 on a GE range indicates a fault within the MTwisT control system related to a false connection on the mains supply. The MTwisT control is an integrated control architecture used in certain GE ranges to manage communication between the user interface, control board, and power delivery components. A "false connection mains" fault means the control has detected an anomaly in how mains (line voltage) power is being sensed or registered, such as an unexpected voltage signal, an intermittent connection, or a wiring condition that does not match what the control expects to see at its mains input terminals.

This fault can stem from loose or corroded wiring connections at the terminal block, a damaged power cord, or internal wiring harness issues that cause the control board to receive inconsistent or incorrect line voltage readings. In some cases, the fault can also point to a failing control board that is misreading the incoming supply due to a defective mains detection circuit on the board itself. The range may have been receiving voltage fluctuations from the household supply as well, which can trigger this type of fault intermittently.

Diagnosing ER 25 requires careful inspection of the mains wiring from the terminal block through to the control board connections. Technicians should check for any signs of arcing, heat damage, or loose terminals, and verify that the incoming line voltage is within the expected range for the unit. If wiring is intact and supply voltage is correct, the control board itself becomes the primary suspect.

Source: manufacturer service documentation.

Common causes of ER 25

  1. 01

    Loose or damaged terminal block wiring

    Wiring / connection

    The wiring connections at the range's terminal block can loosen over time or sustain heat damage, causing the control to receive an inconsistent mains signal. Inspect all terminal connections for tightness, corrosion, or signs of arcing.

  2. 02

    Faulty or damaged power cord

    Part replacement

    A power cord with a broken conductor or damaged insulation can cause intermittent or improper voltage delivery to the control board. Visually inspect the cord for any physical damage and test continuity across each conductor.

  3. 03

    Intermittent household supply voltage

    Wiring / connection

    Voltage fluctuations or an unstable supply from the home's electrical panel can trigger a false connection fault on the mains detection circuit. Check the outlet or breaker for correct voltage and stable delivery.

  4. 04

    Loose internal wiring harness connection

    Wiring / connection

    The wiring harness connecting the terminal block to the control board may have a loose or partially disconnected plug, causing the board to misread the mains input. Inspect all harness connectors along the mains power path inside the range.

  5. 05

    Defective MTwisT control board

    Part replacement

    If all wiring and supply voltage check out correctly, the mains detection circuit on the control board itself may be faulty, causing it to report a false connection even when the actual supply is normal. Board replacement is required in this scenario.

See the test procedure for each cause

Frequently asked questions about ER 25

What does ER 25 mean on a GE range?
ER 25 indicates a fault in the MTwisT control system described as a false connection on the mains supply. This means the control board has detected something unexpected or inconsistent with how it is receiving line voltage. The cause can range from loose wiring at the terminal block to a failing control board. A thorough inspection of the power supply path is needed to pinpoint the issue.
Can I fix ER 25 on my GE range myself?
Some causes of ER 25, such as a loose terminal block connection or a damaged power cord, are within reach for a knowledgeable DIYer comfortable working with high-voltage appliances. However, because this fault involves mains voltage, there is a real safety risk if proper precautions are not taken. If you are not experienced with appliance electrical work, it is best to have a qualified technician perform the diagnosis and repair.
Is it safe to use my GE range while ER 25 is displayed?
It is not recommended to continue using the range while this error is active. ER 25 indicates a problem with the main power connection or its detection, which could point to a wiring fault that poses a potential shock or fire hazard. Discontinue use and unplug or disconnect the range at the breaker until the issue is diagnosed and resolved.
Will resetting my GE range clear the ER 25 error?
Resetting the range by cutting power at the breaker for a few minutes may temporarily clear the error code if the fault was caused by a transient voltage fluctuation. However, if the underlying cause is a physical wiring issue or a failing control board, the code will return once power is restored and the control performs its self-check. A reset should be considered a diagnostic step, not a fix.
How much does it cost to repair ER 25 on a GE range?
Repair costs depend on the root cause. If only a loose connection needs to be secured or a power cord replaced, costs are relatively low, typically in the range of $50 to $150 including labor. If the MTwisT control board itself needs replacement, parts and labor combined can run from $200 to $450 or more depending on the specific model and local labor rates.

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