Bosch Dryer Error Code E:9024

E:9024 is a power supply fault indicating a line synchronization error caused by an external impact to the mains supply. It is the 4-digit equivalent of error E:40. The dryer's control board has detected that the incoming AC voltage or frequency is outside acceptable parameters. This is typically an external issue related to the home's electrical supply rather than an internal dryer component failure.

You should not continue operating the dryer until the cause of the error has been identified. An unstable or out-of-spec power supply can damage the dryer's electronics over time and may indicate a wiring issue that poses a safety risk. Have the mains supply and electrical connections inspected before resuming use.

If the issue is external, such as an unstable utility supply or a faulty outlet, repair costs may range from nothing to around $50 to $150 for an electrician to inspect and correct the wiring. If the main control board is determined to be faulty after ruling out external causes, board replacement parts and labor can range from $150 to $400 or more depending on the specific model and service rates in your area.

Start by checking the mains voltage and frequency at the outlet or terminal block supplying the dryer using a true RMS multimeter. Look for voltage that is out of range or fluctuating, especially while other appliances are running. If the supply is stable and within spec, inspect all wiring connections from the outlet to the dryer's terminal block. If no external power issue is found, the main control board may need to be evaluated or replaced.

A reset may temporarily clear the error code, but if the underlying power supply issue is still present, the code will return. Simply resetting the dryer without addressing the root cause is not a long-term fix. The mains voltage and frequency should be checked and confirmed stable before assuming the problem is resolved.