Polar Refrigerator Error Code dc rE

The dc rE error code on Polar N7LX and N8LX refrigerators indicates that the DC heater relay, designated K1 on the DC board assembly, has failed in a stuck-closed condition. A relay in the stuck-closed state means its contacts have welded or fused together, preventing the relay from opening and interrupting the circuit as intended. This forces the heater circuit to remain continuously energized, which can cause the defrost heater to run without the normal cycling control that prevents ice buildup damage or excessive heat generation within the refrigeration compartment.

The DC board in these Polar models manages critical low-voltage control functions, including the timed activation and deactivation of the defrost heater circuit. When relay K1 fails closed, the board can no longer perform this switching function regardless of input signals from the control system. Relay contact fusion typically results from repeated high-current switching cycles, age-related contact degradation, or a transient electrical surge that causes the contacts to arc and weld together permanently.

Because the fault is internal to the DC board assembly and the relay K1 is integrated into that assembly, the corrective action is replacement of the entire DC board rather than attempting to replace the relay component in isolation. Continuing to operate the refrigerator with this fault active risks prolonged heater operation, elevated temperatures in unintended areas, and potential damage to other components in the refrigeration system.