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y Confirm the furnace is receiving power; check circuit breakers and fuses. Turn off power before inspecting internal components. 2. Check the Thermostat Ensure it’s set to “Heat” and at a higher temperature than current room temperature. Test with a different thermostat

mponents Dirty or restricted condenser coils reduce heat rejection. Faulty expansion valves or TXVs can cause incorrect subcooling readings. Measurement Techniques Ensure gauges are calibrated. Take multiple readings to