Ariston Oven Error Code ER01

ER01 means the oven detected an excessively high temperature inside the cavity during the pyrolysis self-cleaning cycle, as reported by the PTC temperature sensor. The oven interrupts the cycle as a safety measure when this threshold is exceeded. The fault most commonly points to a PTC sensor that is no longer reading within its specified resistance range of 545 ohms at ambient temperature.

You should avoid running the pyrolysis self-cleaning cycle until the fault is resolved, as the error specifically relates to overtemperature conditions during that cycle. Standard baking and cooking functions may still operate, but if the underlying cause is a failing sensor or genuine overheating issue, continued use carries risk. Have the oven inspected before running any high-temperature programs.

Repair costs vary depending on the root cause. A PTC sensor replacement is typically the least expensive fix, with parts generally ranging from $20 to $60 and labor adding $80 to $150 depending on your region and the technician. If the control board requires replacement, total repair costs can rise to $200 to $400 or more. Getting a diagnostic visit before committing to parts helps avoid unnecessary expenses.

A knowledgeable DIYer can begin by testing the PTC sensor with a multimeter at ambient temperature and comparing the reading to the 545 ohm specification. If the sensor is out of range, replacing it is a manageable repair for someone comfortable working with oven components. However, if wiring, cooling fans, or the control board are involved, professional diagnosis is recommended due to the high-voltage components inside the appliance.

A power reset may temporarily clear the error display, but the fault will return if the underlying cause is not corrected. If the PTC sensor is faulty or the oven is genuinely overheating, resetting without repair does not address the problem. The code should be treated as a diagnostic signal rather than a nuisance alert.