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Error code reference

Ariston Oven Error Code ER08

Potentiometer 1 disconnected or short circuit

Ariston codesAriston oven codes

Potentiometer 1 disconnected or short circuit - error impossible on Touch control ovens.

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  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What ER08 means on a Ariston oven

ER08 on an Ariston oven indicates a fault detected with Potentiometer 1, the rotary position sensor used to communicate control knob settings to the oven's main control board. This potentiometer converts the physical position of a selector or temperature knob into an analog signal (typically a variable resistance or voltage) that the control board reads to determine the user's selected setting. When the board detects either an open circuit (disconnected or broken potentiometer) or a short circuit condition on this input, it triggers ER08 and halts normal operation to prevent incorrect temperature or function behavior.

The fault can originate at the potentiometer component itself, which can wear out mechanically from repeated knob rotation, or at the wiring harness connecting it to the main control board. Corroded terminals, loose connector pins, or damaged wiring routed near heat sources inside the oven cavity are frequent contributors. A short circuit may occur if the potentiometer's internal resistive track breaks down and creates an unintended low-resistance path, while an open circuit results from a broken track or severed wire.

Importantly, the error code data specifies that ER08 is impossible on Touch control model ovens. On those appliances, knob-type potentiometers are not present, so if ER08 appears on a Touch control unit, the fault lies within the control board itself misreporting a non-existent input. On knob-controlled models, diagnosis should focus on the potentiometer and its associated wiring before suspecting the main board.

Source: manufacturer service documentation.

Common causes of ER08

  1. 01

    Worn or failed potentiometer

    Part replacement

    Repeated rotation of the control knob gradually wears the internal resistive track of the potentiometer, eventually causing an open circuit or erratic signal. Measure resistance across the potentiometer terminals through its full rotation range and replace if readings are infinite, zero, or highly erratic.

  2. 02

    Loose or disconnected wiring connector

    Wiring / connection

    The connector between the potentiometer and the main control board can loosen over time due to vibration or heat cycling. Inspect the connector at both ends for secure seating and check for any backed-out pins.

  3. 03

    Damaged wiring harness

    Part replacement

    Wires routed near internal oven heat sources can develop insulation breakdown, leading to a short circuit, or can break internally, causing an open circuit. Visually inspect the harness for scorching, chafing, or visible wire damage.

  4. 04

    Corroded or oxidized connector terminals

    Wiring / connection

    Moisture and heat inside the oven environment can cause corrosion at the potentiometer connector terminals, increasing resistance or breaking the circuit entirely. Clean terminals with electrical contact cleaner and check for continuity.

  5. 05

    Faulty main control board (Touch control models only)

    Part replacement

    On Touch control ovens, where no physical potentiometer exists, ER08 appearing indicates the control board is generating a false fault on a non-existent input. In this scenario the control board itself requires inspection or replacement.

See the test procedure for each cause

Frequently asked questions about ER08

What does ER08 mean on a Ariston oven?
ER08 means the oven's control board has detected a disconnection or short circuit on Potentiometer 1, the sensor linked to a control knob. The board cannot read a valid signal from this component and shuts down to avoid operating at an incorrect or unknown setting. On Touch control Ariston ovens, this code should not appear at all, and if it does, the control board itself is the likely source of the fault.
Can I fix ER08 on my Ariston oven myself?
Some causes of ER08 are accessible to a confident DIYer, such as reseating a loose connector or cleaning corroded terminals. However, replacing the potentiometer or main control board involves working with internal oven wiring and components, which carries electrical hazards. If you are not comfortable with appliance disassembly and safe disconnection of power, a qualified technician should perform the repair.
Is it safe to keep using my Ariston oven when ER08 is displayed?
You should not continue using the oven while ER08 is active. The error means the control board cannot correctly read the knob position sensor, so the oven may not respond to your temperature or function selections accurately. Operating the oven in this state risks incorrect heating behavior and potential safety issues.
Will resetting my Ariston oven clear the ER08 error code?
A power reset may temporarily clear the error display, but ER08 will return if the underlying fault with the potentiometer or its wiring has not been corrected. A reset does not repair a failed component or a broken wire. The fault must be diagnosed and the defective part repaired or replaced to permanently resolve the code.
How much does it cost to repair an Ariston oven showing ER08?
Repair costs depend on which component has failed. A replacement potentiometer typically falls in the range of $15 to $50 for the part alone, while a main control board can cost between $80 and $200 or more. Adding professional labor, total repair costs generally range from $100 to $350 depending on the fault, the specific model, and your location.

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