Bosch Washer Error Code Er:07

Bosch washer error code Er:07 indicates that the control board has detected heating activity occurring at an unexpected point in the wash cycle. The machine monitors when the heater element should and should not be active. When the control detects current flowing through the heating circuit during a phase where no heating command has been issued, it triggers Er:07 and halts operation to prevent damage or a safety hazard.

The two primary suspects are a failed heater element and a stuck heater relay on the control board. A heater relay that has welded or fused contacts will allow current to pass to the heating element even when the control board sends no activation signal. This is the most common cause because the relay operates under significant electrical load each cycle, making contact failure a realistic failure mode over time. A faulty heater element with an internal short can also create unintended circuit paths that register as unexpected heating activity.

Diagnosis should begin with test P16, which is the designated heater test procedure for this model. This test allows the technician to evaluate heater circuit behavior under controlled conditions. Inspect the heater element for continuity and resistance values outside specification, then examine the relay on the control board for signs of burning, pitting, or contact fusion. If the relay contacts are stuck closed, the control board will require repair or replacement. If the heater element itself is shorted, it must be replaced before further testing.