Bosch Dryer Error Code E:9002

E:9002 means the dryer detected that the incoming mains voltage was too low to complete a required security test of its fused relay contacts. This safety test must pass before the dryer will start a cycle. The code is the 4-digit version of the older E:89 fault. In most cases the issue originates with the household electrical supply rather than the dryer's internal components.

Simply resetting the dryer may temporarily clear the code, but if the underlying voltage problem is not corrected, the fault will return as soon as the dryer attempts its startup relay test again. Resolve the mains voltage issue first, then reset the unit. Persistent recurrence after a reset strongly suggests an ongoing electrical supply problem.

If the cause is a household wiring or electrical supply issue, costs typically range from nothing (if it is a utility brownout) to several hundred dollars for breaker replacement or outlet rewiring by a licensed electrician. If the problem is inside the dryer, such as a faulty power inlet or wiring harness, parts and labor can range from around fifty dollars to a few hundred dollars depending on the specific component and local labor rates.

Start by measuring the voltage at the dryer's wall outlet using a multimeter to confirm the supply voltage is within the required range. Check that the dryer is on a dedicated circuit and that no other high-draw appliances are sharing it. Inspect outlet connections and the breaker for looseness or damage. If the outlet voltage is correct and the error continues, an internal component such as the power inlet or wiring harness may need further diagnosis.

No. The dryer is designed to refuse operation when this code is active because it cannot verify the safety state of its relay contacts under low-voltage conditions. Running the dryer while bypassing this fault is not recommended, as unverified relay behavior could pose a fire or electrical hazard. Address the power supply issue before resuming use.