Ariston Oven Error Code ER50

ER50 on an Ariston oven indicates a zero crossing fault, meaning the control system is not detecting the synchronization pulses it needs from the AC mains supply. These pulses are generated by the power supply board and are used to time and regulate power delivery to the heating elements. When they are absent, the oven triggers ER50 and stops normal operation. The power supply board is the primary component to inspect and replace when this code appears.

No, you should not attempt to use the oven while ER50 is active. The fault means the oven cannot properly control power delivery to the heating elements, which could result in uncontrolled heating or other unpredictable behavior. Keep the oven switched off until the fault has been diagnosed and repaired.

Repair costs depend on whether the issue is a simple wiring or fuse problem versus a full power supply board replacement. A power supply board replacement, including parts and labor, typically falls in the range of $150 to $350 depending on your location and the specific model. Getting a quote from a qualified technician before committing to the repair is advisable.

A basic check of the oven's mains supply, fuses, and wiring connections can be performed by a knowledgeable DIYer. However, replacing the power supply board involves working near high-voltage components and requires disconnecting mains power before beginning any work. If you are not experienced with appliance electrical repair, this job is best left to a qualified technician.

A power reset, such as switching the oven off at the circuit breaker for several minutes, may temporarily clear the display. However, if the underlying fault with the power supply board or mains supply is not resolved, the ER50 code will return when the oven is powered back on. A reset alone is not a fix for this fault.