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Error code reference

Ariston Oven Error Code ER90

Key17 fault on Touch control

Ariston codesAriston oven codes

Key17 fault on Touch control — touch button malfunction.

First step from the service manual

Open door, wait for condensation to dry; if fault persists and all inductive rubber pieces are present, replace display board.

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

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What ER90 means on a Ariston oven

The ER90 error code on an Ariston oven indicates a fault with Key17 on the touch control panel. This is a specific button malfunction within the capacitive or resistive touch interface that governs oven operation. The touch control system relies on inductive rubber contact pieces seated beneath the display panel to register button presses. When one of these contact points fails to respond correctly, or sends an erratic signal, the control board interprets this as a Key17 fault and triggers the ER90 code.

The most common cause of this error is moisture or condensation on or behind the touch panel. Steam from cooking can migrate into the control panel area and temporarily disrupt the electrical contact between the inductive rubber pieces and the display board. This is why the first diagnostic step is to open the oven door and allow the condensation to fully dry before drawing any further conclusions. In many cases, the error will clear on its own once the moisture dissipates.

If the ER90 fault persists after the panel has dried, the next step is to physically inspect the inductive rubber contact pieces that sit beneath the touch keys. If any of these rubber inserts are missing, dislodged, or damaged, the Key17 position will register a continuous fault signal. When all rubber pieces are confirmed to be present and properly seated but the error continues, the display board itself has failed internally and will need to be replaced to restore normal operation.

Source: manufacturer service documentation.

Common causes of ER90

  1. 01

    Condensation on the touch panel

    Wiring / connection

    Steam or moisture from cooking can collect behind the touch control panel and disrupt the Key17 contact point. Open the oven door and allow the panel to dry completely before testing again.

  2. 02

    Missing or dislodged inductive rubber contact piece

    Part replacement

    Each touch key relies on a small inductive rubber insert to make proper contact with the display board. If the rubber piece for Key17 is missing or out of position, the fault will persist even after drying.

  3. 03

    Damaged inductive rubber contact piece

    Part replacement

    A rubber contact insert that is cracked, compressed, or deformed will not transmit the correct signal to the board, resulting in a continuous Key17 fault reading.

  4. 04

    Failed display board

    Part replacement

    If condensation has been ruled out and all inductive rubber pieces are present and undamaged, the display board itself has developed an internal fault and is misreading the Key17 input. The board must be replaced.

See the test procedure for each cause

Frequently asked questions about ER90

What does ER90 mean on a Ariston oven?
ER90 on an Ariston oven indicates a Key17 fault on the touch control panel, meaning one specific touch button is malfunctioning or sending an incorrect signal. The error is commonly triggered by moisture or condensation behind the panel, or by a missing inductive rubber contact piece. Opening the oven door and allowing the control panel to dry is the recommended first step. If the code persists after drying, further inspection of the touch panel components is needed.
Can I fix the ER90 error myself without calling a technician?
In some cases, yes. Start by opening the oven door and letting any condensation dry out completely, which resolves the fault for many users. If the error returns, you can inspect the inductive rubber contact pieces beneath the touch panel to check whether any are missing or displaced. However, if the display board itself has failed, replacing it requires comfort with appliance disassembly and electrical components, so a technician may be preferable.
Is it safe to use my Ariston oven while the ER90 code is showing?
It is generally advisable to avoid using the oven until the fault is resolved. A malfunctioning touch key could prevent you from accurately controlling oven settings or responding to other alerts. Allow the panel to dry first, and if the code clears, normal use can resume. If the error persists, have the oven inspected before continuing to cook with it.
Will resetting the oven clear the ER90 error code?
A simple power reset may temporarily clear the code, but if the underlying cause such as moisture or a damaged rubber contact piece is still present, the error will return. Allow the control panel to fully dry before attempting a reset. If the fault is due to a failed display board, resetting the power will not resolve it and the board will need to be replaced.
How much does it cost to fix the ER90 error on an Ariston oven?
If the error is caused only by condensation, there is no cost involved since allowing it to dry resolves the fault. A replacement inductive rubber contact piece, if needed, is typically a low-cost part. Replacing the display board is the most expensive scenario, with parts and labor combined potentially ranging from $100 to $300 or more depending on the model and service rates in your area.

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