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the capacitor is likely the culprit
the internal circuit or the relay coil has likely failed
providing a clear path for line voltage while isolating the sensitive control board from inductive flyback
Its galvanized steel housing and UL555S listing make it a standard choice for contractors maintaining multi-section dampers where UL2043 plenum rating is required
MARS 43330 Pressure Switch 321142-301 the capacitor is likely theThe MARS 43330 Pressure Switch is a professional grade high pressure cut out designed for precise system protection in residential and commercial HVAC R systems. Engineered as a fixed setting pressure control, this SPST high pressure switch features an automatic reset (A R) mechanism, opening the circuit on pressure rise at 400 PSI and closing it back at 280 PSI. This reliable electromechanical sensor is essential for preventing compressor damage due