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Error code reference

Ariston Oven Error Code ER72

Communication fault between display board and conversion board (Touch models only).

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Communication fault between display board and conversion board (Touch models only).

First step from the service manual

Verify connection between conversion board and main board.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What ER72 means on a Ariston oven

ER72 is a communication fault code specific to Ariston touch-control ovens. It indicates that the display board and the conversion board have lost the ability to exchange data reliably. The conversion board in these models acts as an intermediary that translates touch input signals and relays control information between the user interface (display board) and the main control board. When this communication link breaks down, the oven cannot process user commands correctly and triggers the ER72 fault to alert the technician.

The most common point of failure in this fault is the physical connection between the conversion board and the main board. Loose, corroded, or damaged wiring harness connectors along this data path will interrupt the signal and produce the fault. The ribbon cables or wire harnesses used in touch-model ovens are particularly susceptible to heat degradation over time, which can cause intermittent or permanent communication failures. A technician should begin by inspecting and reseating all connectors between these components before assuming a board-level failure.

If connector integrity checks out, the fault likely points to a defective conversion board or display board. Board failures can result from moisture ingress, heat damage, or component-level faults on the PCB itself. In some cases, a faulty main board that is not responding to the conversion board's signals can also produce this code. Systematic isolation of each board through substitution or resistance and voltage checks at the connector pins is the recommended approach to confirm which component has failed.

Source: manufacturer service documentation.

Common causes of ER72

  1. 01

    Loose or disconnected wiring harness

    Wiring / connection

    The connector between the conversion board and the main board may have worked loose due to vibration or heat cycling. Reseating all connectors along this data path is the first and most important diagnostic step.

  2. 02

    Damaged or degraded ribbon cable or wire harness

    Part replacement

    Heat exposure over time can cause the insulation or contacts on the wiring harness to deteriorate, leading to intermittent or permanent signal loss. Inspect cables for discoloration, fraying, or broken contact pins.

  3. 03

    Faulty conversion board

    Part replacement

    The conversion board itself may have failed due to heat damage, moisture, or a component-level fault on the PCB. If connections are intact and the fault persists, the conversion board is the next likely suspect.

  4. 04

    Faulty display board

    Part replacement

    The display board may have failed and is no longer sending or receiving data correctly. This is typically confirmed by substitution testing after ruling out the wiring and conversion board.

  5. 05

    Defective main control board

    Part replacement

    If the main board is not responding to signals from the conversion board, it can produce this fault code. This is the least common cause and should be investigated after all other components have been checked.

See the test procedure for each cause

Frequently asked questions about ER72

What does ER72 mean on a Ariston oven?
ER72 indicates a communication fault between the display board and the conversion board, and it only appears on Ariston touch-control oven models. The conversion board is responsible for translating touch inputs and relaying signals between the display and the main control board. When this communication link fails, the oven displays ER72 and cannot operate normally. A technician will need to inspect the wiring connections and internal boards to identify the root cause.
Can I fix ER72 on my Ariston oven myself?
If you are comfortable working with appliance electronics, you can begin by checking that all wire harness connectors between the conversion board and main board are firmly seated, as a loose connection is the most common cause. However, if the fault persists after reseating connectors, diagnosing and replacing the conversion board, display board, or main board requires technical knowledge and the correct replacement parts. For most homeowners, calling a qualified appliance technician is the safest and most reliable approach.
Will resetting the oven clear the ER72 error code?
A power reset by switching off the oven at the circuit breaker for a few minutes may temporarily clear the ER72 code if the fault was caused by a transient communication glitch. However, if there is an underlying hardware issue such as a loose connector, damaged cable, or failed board, the code will return. A reset should be considered a temporary measure only, not a fix.
Is it safe to use my Ariston oven when ER72 is displayed?
When ER72 is active, the oven cannot reliably communicate between its control boards, which means it may not respond correctly to your inputs or maintain proper control of heating functions. Operating the oven in this state is not recommended, as the control system may behave unpredictably. It is best to leave the oven off until the fault has been diagnosed and repaired.
How much does it cost to repair an ER72 fault on an Ariston oven?
Repair costs depend on which component has failed. If only a wiring harness or connector needs to be replaced, costs are generally lower, typically in the range of $50 to $150 including labor. If a conversion board, display board, or main control board needs to be replaced, parts alone can range from $80 to $300 or more, with additional labor charges on top. Getting a diagnostic assessment from a technician before committing to repairs is the best way to understand the total cost.

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