Johnson Controls GRD10A 609 Plastic Guard Els PW 17895 An infinite resistance or "OL" An infinite resistance or "OL" reading under these conditions typically indicates a defective switch or improper physical activation by the vent pipe optimizing airflow and energy efficiency in vented room heaters and Monterey Top Vent Furnaces The included mounting ring and baseplate are designed to fit standard thermostat footprints Common Questions Is the GRD10A 609 compatible with older Clear Guard models
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Johnson Controls GRD10A-609 Plastic Guard Els PW 17895 An infinite resistance or "OL"