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This listing covers the factory OEM replacement pressure switches for the Carrier CH13NA04200GACAA packaged or split-system unit — including the High Pressure Switch (OEM# 312926-252) and the Low Pressure Switch (OEM# 312926-258). Pressure switches prove that the inducer motor has created adequate draft before allowing the ignition sequence to proceed. A failed pressure switch causes the control board to lock out the system before a flame is ever established — commonly misdiagnosed as an igniter or gas valve failure. Symptoms include a running inducer with no ignition attempt, a flashing fault code for "pressure switch open," or intermittent short-cycling during cold weather.
Compatibility: Engineered specifically for the Carrier CH13NA04200GACAA. Select the correct switch — high (312926-252) or low (312926-258) — based on your fault code and confirmed hose port location. Verify your existing switch's part number stamp before ordering. Not sure which one you need? Our HVAC parts specialists confirm fitment at no charge before you buy. In stock — ships today.