Ariston Washer Error Code CON

The CON code on an Ariston washer is a warning that the conductivity sensor has been detected as disconnected or is not sending a signal to the control board. The conductivity sensor monitors water quality to adjust the number of rinse cycles. When this warning is active, the washer continues to operate but defaults to the maximum of three rinses per cycle to ensure proper rinsing without sensor input.

Start by inspecting the wiring harness connector at the conductivity sensor to make sure it is fully seated and free of corrosion. Trace the wire from the sensor back toward the control board and check for any visible damage or pinching. If the wiring is intact, test the sensor itself for proper function and replace it if it has failed. A faulty control board input is a less common but possible cause if all other components check out.

If the fix is simply reseating a loose connector or cleaning corroded terminals, there may be no parts cost at all. Replacing the conductivity sensor typically costs in the range of $20 to $60 for the part, depending on the specific model. If the control board is the root cause, replacement costs can range from $100 to $250 or more for the part alone, plus any applicable labor charges.

Yes, the CON code is a warning rather than a full error that stops the machine. Your washer will continue to run all cycles normally. The only functional difference is that it will automatically use three rinse cycles every time, which may increase cycle time and water usage until the sensor issue is resolved.

A reset may temporarily clear the CON code from the display, but it will return as soon as the washer checks the conductivity sensor circuit again and finds it disconnected. The code will only clear permanently once the underlying wiring or sensor issue has been corrected and the control board receives a valid signal from the sensor.