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Error code reference

GE Range Error Code SUPPLY MISWIRED

Power monitor detects miswired supply

GE codesGE range codes

Power monitor detects miswired supply — during power-up L1-L2 <90VAC with L1-N >90VAC and <150VAC, or after power-up L1-N >150VAC.

First step from the service manual

Check wiring connections at terminal block for proper L1, L2, and N assignment.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What SUPPLY MISWIRED means on a GE range

The SUPPLY MISWIRED error on a GE range is generated by the control board's power monitor circuit when it detects abnormal voltage relationships between the incoming line conductors. The power monitor continuously evaluates voltage levels at L1, L2, and neutral (N) to confirm the range is receiving a properly wired 240VAC split-phase supply. During power-up, if the voltage measured between L1 and L2 is below 90VAC while the voltage between L1 and neutral simultaneously reads above 90VAC and below 150VAC, the monitor flags a miswired supply condition. After the unit has powered up, the error will also trigger if L1-to-neutral voltage exceeds 150VAC, which indicates a lost neutral or an incorrect conductor assignment at the terminal block.

The most likely physical cause is incorrect wire placement at the range's terminal block, where L1, L2, and neutral must be landed on their designated terminals. A common wiring error occurs when the neutral conductor is swapped with one of the hot legs, or when a 3-wire installation is attempted with incorrect conductor assignments. In some cases, the fault originates at the wall outlet or junction box rather than at the range itself, particularly if the circuit was recently modified or if the home uses aluminum wiring that has loosened at a connection point.

Because this error involves the 240VAC supply circuit, all diagnostic work should be performed with the range disconnected from power before touching any wiring, with voltage verification done using a properly rated multimeter only after restoring power temporarily for measurement purposes. The first step is to inspect the terminal block at the rear of the range and confirm that each conductor is landed on its correct terminal according to the wiring diagram on the appliance.

Source: manufacturer service documentation.

Common causes of SUPPLY MISWIRED

  1. 01

    Incorrect wire placement at the range terminal block

    Wiring / connection

    The neutral and one or both hot leg conductors are landed on the wrong terminals at the rear of the range. Visually inspect each wire position against the wiring label on the appliance and verify with a multimeter.

  2. 02

    Neutral conductor swapped with a hot leg

    Wiring / connection

    When the neutral wire is connected to an L1 or L2 terminal, the voltage ratios the power monitor detects will match the SUPPLY MISWIRED fault conditions exactly. This can happen during installation if conductors are not color-coded or are mislabeled.

  3. 03

    Faulty or miswired wall outlet or junction box

    Wiring / connection

    The wiring error may originate upstream of the range at the wall receptacle or hardwire junction box. Check that L1, L2, and neutral are correctly assigned at that connection point as well, especially if the circuit was recently serviced.

  4. 04

    Lost or high-resistance neutral connection

    Wiring / connection

    A broken, loose, or corroded neutral conductor can cause the L1-to-neutral voltage to rise above 150VAC, triggering the post-power-up version of this fault. Inspect the neutral connection at the terminal block, outlet, and panel for looseness or corrosion.

  5. 05

    Damaged or incorrect power cord (on cord-connected models)

    Part replacement

    A 3-wire or 4-wire power cord with an internal wiring defect, or a cord that does not match the installation requirements, can deliver incorrect voltage relationships to the terminal block. Inspect the cord for damage and confirm it is the correct type for the installation.

See the test procedure for each cause

Frequently asked questions about SUPPLY MISWIRED

What does SUPPLY MISWIRED mean on a GE range?
SUPPLY MISWIRED means the range's power monitor has detected that the incoming 240VAC electrical supply is not wired correctly. Specifically, it checks the voltage between L1, L2, and neutral, and flags an error if those voltages fall outside the expected ranges for a properly wired split-phase circuit. This is a supply-side wiring problem, not a failed component inside the range itself. The range will not operate normally until the wiring is corrected.
Can I fix a SUPPLY MISWIRED error on my GE range myself?
If you are comfortable and qualified working with household 240VAC wiring, you can inspect the terminal block at the back of the range and verify that each conductor is landed on the correct terminal. However, if the problem originates at the wall outlet, junction box, or electrical panel, that work should be performed by a licensed electrician. Never touch any wiring connections while the range is energized.
Is it safe to use my GE range while the SUPPLY MISWIRED error is displayed?
No, you should not attempt to operate the range while this error is active. A miswired supply can result in incorrect voltages reaching internal components, which can cause component damage or create a shock hazard. The range should remain unplugged or the circuit breaker should be turned off until the wiring issue is properly diagnosed and corrected.
Will resetting the GE range clear the SUPPLY MISWIRED error?
Resetting the range by cycling the power or tripping the breaker will not permanently clear this error if the underlying wiring problem still exists. The power monitor checks supply voltages during and after power-up, so the fault will return immediately once power is restored to a still-miswired circuit. The error will only stop appearing after the wiring is corrected.
How much does it cost to fix a SUPPLY MISWIRED error on a GE range?
If the issue is simply a wire landed on the wrong terminal at the range's terminal block, the repair cost may be minimal, covering only a service call fee, which typically ranges from $75 to $150 depending on your area. If the problem is at the wall outlet or requires an electrician to correct wiring in a junction box or panel, costs could range from $100 to $400 or more depending on the scope of work. A new power cord, if that is the cause, generally costs between $20 and $60 for the part alone.

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