Bosch Dryer Error Code E:0103

E:0103 is a Power Unit safety test failure code, specifically indicating that the security test of the fused relay contacts failed when tested through the master relays. It is the 4-digit version of the E:90 code. The dryer performs this self-test to confirm that the motor control relays are operating safely, and it stops running when the test does not pass.

No, you should not continue operating the dryer while this error is active. The E:0103 code indicates a failure in a safety relay test that is designed to protect the dryer and your home. The dryer disables itself for this reason, and running it in a faulted state is not recommended until the underlying cause is diagnosed and repaired.

Repair costs vary depending on what component is at fault. If the fix involves reseating or replacing the wire harness, costs are generally lower, typically in the range of $75 to $200 including labor. If the Power Unit assembly requires replacement, parts and labor combined can range from $200 to $450 or more depending on your location and the specific model.

Start by inspecting the wire harness between the Power Unit and the motor for any signs of damage, loose connectors, or corrosion. Reseat all connectors and check for continuity across the harness. If the harness is in good condition, the Power Unit assembly likely has a failed relay and will need to be replaced by a qualified technician.

A reset may temporarily clear the code, but because E:0103 is triggered by an active hardware safety test failure, the error will almost certainly return as soon as the dryer performs its self-test again. The underlying issue with the harness or the Power Unit relay must be physically repaired before the code will stay cleared.