Ariston Oven Error Code ER89

ER89 indicates a fault with Key16 on the Ariston oven's touch control panel. The control board has detected that this specific touch button is malfunctioning, either registering a false signal or failing to respond correctly. The most common cause is condensation on the panel, though a dislodged internal rubber contact piece or a failed display board can also trigger this code.

A power reset may temporarily clear the code if the underlying cause was transient moisture that has since dried. However, if a rubber contact piece is missing or the display board has an internal fault, the code will return after the reset because the root problem has not been addressed. A reset is worth trying as an initial step, but should not be relied upon as a permanent fix.

If the fault is caused by condensation or a displaced rubber contact piece, the repair cost may be minimal or involve only a low-cost replacement part. If the display board needs to be replaced, parts and labor costs typically range from around $150 to $350 depending on your region and the specific model. Getting a quote from a qualified technician before authorizing the repair is always a good idea.

Start by opening the oven door and waiting for any condensation to fully dry from the touch panel surface. If the fault clears, no further action is needed. If it persists, inspect the inductive rubber contact pieces on the back of the touch panel to confirm all are present and properly seated. If the rubber pieces are intact and the fault still does not clear, the display board will need to be replaced.

ER89 relates to the touch control input panel rather than a heating or safety system fault, but you should avoid operating the oven while a control board malfunction is active. A faulty touch key could potentially register unintended commands. It is best to resolve the fault before resuming normal use.