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Error code reference

Electrolux Ice Maker Error Code OP

Open Mold Thermistor detected during Ice Maker diagnostic test 56C.

Electrolux codesElectrolux ice maker codes

Open Mold Thermistor detected during Ice Maker diagnostic test 56C.

First step from the service manual

Access 6-pin connector at front of Ice Maker compartment, disconnect, and check resistance of Mold Thermistor across pins 1 (WHT) and 4 (WHT) on the Ice Maker side.

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

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What OP means on a Electrolux ice maker

The OP error code on an Electrolux ice maker indicates an open mold thermistor condition, detected during diagnostic test 56C. The mold thermistor is a temperature-sensing component embedded in or attached to the ice mold (the tray where water freezes into cubes). It provides the control board with continuous temperature feedback so the ice maker can determine when the mold has reached the correct freeze temperature and when it has warmed sufficiently during the harvest cycle. An "open" condition means the circuit through the thermistor is broken, producing no readable resistance signal. The control board interprets this as a fault and triggers the OP code.

The thermistor connects to the control system through a 6-pin connector located at the front of the ice maker compartment. The mold thermistor signal runs across pins 1 and 4 on the ice maker side of that connector, both of which are white wires. When the circuit is intact and the thermistor is functioning, resistance across those pins will fall within an expected range based on mold temperature. An open circuit produces infinite or unmeasurable resistance, confirming the fault.

Common causes include a failed thermistor (internal break in the sensing element), damaged wiring between the thermistor and the connector, or a loose or corroded connection at the 6-pin connector itself. Because the thermistor is a sealed component, physical damage from ice buildup or repeated freeze-thaw cycling can degrade the element over time. Diagnosing the fault begins at the 6-pin connector: disconnecting it and measuring resistance across pins 1 and 4 on the ice maker side will confirm whether the thermistor or its wiring is the source of the open circuit.

Source: manufacturer service documentation.

Common causes of OP

  1. 01

    Failed Mold Thermistor

    Part replacement

    The thermistor's internal sensing element has broken, producing an open circuit. This is the most common cause and will show infinite resistance when measured across pins 1 and 4 of the 6-pin connector on the ice maker side.

  2. 02

    Broken or Severed Thermistor Wiring

    Part replacement

    The white wire leads running from the thermistor to the 6-pin connector can crack or break due to repeated flexing, freezing, or mechanical stress. A visual inspection of the wiring harness along the ice maker compartment may reveal the damage.

  3. 03

    Loose or Disconnected 6-Pin Connector

    Wiring / connection

    If the 6-pin connector at the front of the ice maker compartment is not fully seated, the thermistor circuit will appear open to the control board. Disconnecting and firmly reseating the connector may resolve the fault.

  4. 04

    Corroded Connector Pins

    Wiring / connection

    Moisture in the ice maker compartment can cause corrosion on the connector pins, increasing resistance to the point of an open circuit. Inspect pins 1 (WHT) and 4 (WHT) for oxidation or buildup and clean or replace the connector as needed.

  5. 05

    Ice Buildup Damaging the Thermistor

    Part replacement

    Excessive ice accumulation around the mold area can physically stress or dislodge the thermistor from its mounting position, breaking its electrical connection or damaging the component itself.

See the test procedure for each cause

Frequently asked questions about OP

What does OP mean on a Electrolux ice_maker?
The OP code means the ice maker has detected an open circuit in the mold thermistor during diagnostic test 56C. The mold thermistor is the temperature sensor that monitors the ice tray, and an open condition means the control board is receiving no resistance signal from it. This prevents the ice maker from operating normally. The fault must be diagnosed at the 6-pin connector at the front of the ice maker compartment.
Can I fix the OP error code myself?
A knowledgeable DIYer can begin by accessing the 6-pin connector at the front of the ice maker compartment and checking for a loose or disconnected connection. If the connector is secure, measuring resistance across pins 1 and 4 on the ice maker side with a multimeter will indicate whether the thermistor is the problem. Replacing the mold thermistor itself is a moderately involved repair that requires disassembling part of the ice maker, so comfort with appliance repair work is recommended before attempting it.
Is it safe to continue using the ice maker when the OP code is displayed?
The ice maker will not produce ice while the OP fault is active, as the control board requires a working mold thermistor to safely manage the freeze and harvest cycles. There is no immediate safety hazard to the surrounding appliance or home from the error code itself. However, leaving the fault unresolved means the ice maker remains non-functional until the thermistor circuit is repaired.
How much does it cost to repair the OP error code on an Electrolux ice maker?
If the fix is simply reseating a loose 6-pin connector, there is no parts cost involved. If the mold thermistor itself needs replacement, parts typically range from $20 to $60 depending on the specific model. Adding professional labor, total repair costs generally fall in the range of $80 to $200. Wiring harness damage can push costs higher if a larger section of the harness needs replacement.
Will resetting the ice maker clear the OP error code?
Resetting the ice maker may temporarily clear the code, but the fault will return if the underlying cause has not been corrected. The OP code is triggered by an active open circuit in the mold thermistor, so until the thermistor, its wiring, or the connector is repaired, the control board will detect the same fault condition and reactivate the error. A reset is useful only after a confirmed repair to verify the code does not return.

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