Ariston Oven Error Code ER72

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.

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.

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.

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.

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.