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(888) 312-8812 Login SignupWhy does an A/C system shut the compressor off on its own when the charge is low or pressure spikes? The Red Dot HVAC Binary Switch is the pressure monitor that cuts the compressor when system pressure moves outside safe limits. Swapping a failed switch for the Red Dot RD-5-4640-0 brings the safeguard back, so the compressor runs only when the system is ready for it. Without that protection, the A/C may refuse to engage or the compressor may run unprotected and fail early.
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