ActronAir Resistor 1 Watt 220K Ohm is a precision resistor used in the outdoor PCB control circuits of PCG233U and SRA233C residential split ducted systems, providing a specific 220K ohm resistance value for voltage division or biasing in the board's sensing circuit. Substituting an incorrect resistance value alters the circuit's sensing characteristics and can cause erratic fault code behaviour or failure to detect fault conditions. Isolate power at mains before replacing any PCB circuit components.