McDonnell & Miller FS4 3T3 1 Switch Refrigerant and AUX series furnaces and AUX series furnaces or diagnostic codes indicating a "pressure switch stuck open" or "failed to close" error 1" NPT In Line Low Flow Rate Liquid Flow Switch with Snap Acting SPDT Switch (Part Number 115300)
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McDonnell & Miller FS4-3T3-1 Switch Refrigerant and AUX series furnaces