Ariston Oven Error Code ER79

ER79 indicates a fault with Key6, one of the touch buttons on the oven's touch control panel. The control board has detected an abnormal signal from that specific button position. This can be caused by moisture, a displaced internal rubber contact piece, or a failed display board. The error may clear on its own after the panel dries out.

ER79 relates to the touch control interface rather than a heating or safety-critical component, so the risk level depends on how the oven responds to the fault. If the oven becomes unresponsive or behaves erratically due to the Key6 fault, it is best to stop using it until the issue is diagnosed. Continuing to use an oven with a malfunctioning control panel can make it difficult to set or change cooking functions reliably.

If the fault clears after drying, there is no parts cost involved. If the inductive rubber piece needs to be replaced, parts costs are typically low, though labor charges from a technician will apply. A full display board replacement, which is the most involved repair for this fault, generally brings total costs into the range of $100 to $300 or more depending on parts availability and local labor rates.

The first step you can take yourself is opening the oven door and allowing any condensation around the control panel to dry completely, which sometimes resolves the fault. If the error persists, you can inspect the touch panel area for visible damage or debris. Beyond that, resolving the issue requires accessing the internal inductive rubber pieces or replacing the display board, which involves disassembling the control panel and is better suited to someone with appliance repair experience.

A power reset by switching off the oven at the breaker or unplugging it for several minutes may temporarily clear the error if it was triggered by a transient moisture event. However, if the underlying cause is a damaged inductive rubber piece or a failed display board, the fault will return after power is restored. A reset is worth attempting but should not be relied upon as a permanent fix.