De Dietrich 81994927 5-pin connector

This 5-pin connector from De Dietrich is an item from the plugs and connectors category. Parts of this type carry low-voltage signals and mains supply between the control board and the burner or boiler components. In a burner system, the harness links the burner control, sensors, actuators, and fuel valves. A 5-pin connector is matched by pin count, pitch, and keying rather than by the function it serves; the same connector series can be used for different signal paths. When selecting a replacement, the critical parameters are the connector series (which determines pitch and keying), pin count, conductor cross-section, insulation temperature class, length, and terminal type. A 5-pin connector must have the correct pin layout to avoid miswiring. Poor contact in a connector can reproduce almost any electrical fault symptom, making connectors a routine suspect during fault finding. If a burner locks out intermittently or shows erratic behaviour, inspecting the connector pins for corrosion, bent pins, or loose fits is a sensible first step before replacing more expensive components.