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Error code reference

Electrolux Oven Error Code LPIn

Boiler water level probe issue

Electrolux codesElectrolux oven codes

Boiler water level probe issue - working probe on, safety probe off (WL-SL). Humid lime shortcutting boiler level sensors or insulation issues with boiler level sensors.

First step from the service manual

Run a cleaning program including rinse and descale cycle using 2 tablets C25 only; check X25 on ACU.

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

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What LPIn means on a Electrolux oven

The LPIn error code on an Electrolux oven indicates a conflict between the two boiler water level sensors: the working probe (WL) is reading as active while the safety probe (SL) is reading as inactive. These two probes are designed to work in tandem to monitor the water level inside the steam boiler. When their signals disagree in this specific pattern, the control system flags the mismatch as a fault condition and displays LPIn to alert the technician that the boiler level sensing circuit requires attention.

The most common root cause of this fault is lime scale buildup combined with humidity inside the boiler cavity. Humid lime deposits can create a conductive bridge between the level sensor contacts, causing the working probe to register a false positive signal. Separately, degraded insulation on the boiler level sensor wiring or probe bodies can produce similar cross-signal interference. Both conditions effectively fool the control board into seeing conflicting states from the two sensors.

The first diagnostic step is to run a full cleaning cycle that includes rinse and descale stages using two C25 descaling tablets. This process targets lime and mineral deposits that may be shorting the sensor contacts. After the cleaning cycle completes, the technician should inspect connector X25 on the ACU (Appliance Control Unit) to check for corrosion, moisture ingress, or loose pin connections that could be contributing to the sensor signal discrepancy.

Source: manufacturer service documentation.

Common causes of LPIn

  1. 01

    Lime scale bridging boiler level sensors

    Wiring / connection

    Mineral deposits and humid lime buildup inside the boiler can create a conductive path between the working probe and safety probe contacts, causing them to report conflicting states. Running a descale cycle with two C25 tablets is the first step to clear this condition.

  2. 02

    Degraded sensor probe insulation

    Part replacement

    If the insulation on the boiler level sensor probes or their wiring has deteriorated, it can cause signal leakage between the WL and SL circuits. Inspect the probes visually for cracked or worn insulation and test for continuity shorts.

  3. 03

    Corrosion or moisture at connector X25 on the ACU

    Wiring / connection

    The X25 connector on the Appliance Control Unit carries the level sensor signals, and moisture or corrosion at this connector can cause one probe signal to drop out or cross-feed with the other. Inspect X25 for oxidized pins, moisture residue, or loose terminals.

  4. 04

    Faulty safety probe (SL)

    Part replacement

    If the safety probe itself has failed open, it will consistently read as off even when the working probe reads active, matching the WL-SL fault pattern. Testing the probe for correct resistance and continuity can confirm whether replacement is needed.

  5. 05

    ACU control board fault

    Part replacement

    In cases where cleaning, connector inspection, and probe testing all check out correctly, the ACU itself may be misinterpreting the sensor signals due to an internal board fault. This is the least common cause and should be diagnosed only after all other causes are ruled out.

See the test procedure for each cause

Frequently asked questions about LPIn

What does LPIn mean on a Electrolux oven?
LPIn indicates a conflict between the two boiler water level sensors. Specifically, the working probe is reading as active while the safety probe is reading as inactive, which is a condition the control system flags as a fault. The most common cause is humid lime deposits inside the boiler shorting or interfering with the sensor contacts. Running a descale cycle with C25 tablets is the recommended first diagnostic step.
Can I fix the LPIn error myself without calling a technician?
In many cases, running a complete cleaning program that includes a rinse and descale cycle using two C25 tablets will resolve the fault if lime buildup is the cause. If the error persists after descaling, further diagnosis involving the X25 connector on the ACU and physical inspection of the boiler level probes is required. That level of diagnosis is more suited to a qualified appliance technician, particularly because it involves inspecting internal wiring and control board connections.
Is it safe to keep using my Electrolux oven when LPIn is displayed?
Continuing to operate the steam functions of the oven while LPIn is active is not recommended. The safety probe is reading as off, which means the boiler's secondary level protection is not functioning as intended. Using the appliance in this state could allow the boiler to operate outside its safe water level range. Address the fault before resuming steam cooking.
How much does it typically cost to repair the LPIn error on an Electrolux oven?
If the issue is resolved by a descale cycle, the cost is limited to the price of C25 descaling tablets, which are inexpensive. If sensor probes need replacement, parts and labor costs can range from roughly 100 to 300 dollars depending on your location and service provider. An ACU control board replacement, if required, would fall on the higher end of repair costs and could range from 200 to 500 dollars or more including labor.
Will resetting my Electrolux oven clear the LPIn error code?
A simple power reset is unlikely to permanently clear the LPIn error if the underlying cause, such as lime buildup or a sensor fault, has not been addressed. The code will typically return once the oven resumes normal operation and the boiler sensors are polled again. Performing the descale cycle and inspecting the X25 connector are the correct steps to resolve the fault rather than relying on a reset.

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