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an open circuit (OL) indicates a failed element
you can measure the Ohms (resistance) across the leads and compare it to the Mitsubishi resistance-temperature chart for this specific HVAC temperature sensor
and Daikin electric heat kits
or within industrial control panels
Look for signs of air leakage (audible hissing) at the actuator housing or a damper that fails to modulate when the thermostat calls for a change in VAV box airflow
Laars Heating Systems T2016800 Front Tile 340793-762 an open circuit (OL) indicatesFor service contractors maintaining high capacity hydronic systems, the Laars T2016800 Front Tile is a mission critical OEM replacement part designed for thermal management and combustion chamber integrity. This 5 hole ceramic refractory tile is engineered to withstand the intense heat profiles of industrial and commercial boilers, specifically the Laars Pennant and Mighty Therm2 series. Its precision engineered 5 hole design ensures exact alignment