OEM Carrier High & Low Pressure Switch Set for Model CH13NA03100GAAAA

This OEM-matched pressure switch set includes both the high pressure switch (312926-252) and the low pressure switch (312926-258) factory-specified for the Carrier CH13NA03100GAAAA packaged or split-system unit. Pressure switches prove that the inducer motor has established adequate draft before allowing the ignition sequence to proceed. A failed pressure switch causes the system to lock out before ignition — commonly misdiagnosed as an igniter or control board fault. Symptoms include a running inducer with no spark, a flashing fault code for "pressure switch stuck open," or intermittent no-heat calls that seem to resolve on their own.

• Specs: High Pressure Switch — OEM Part 312926-252 | Low Pressure Switch — OEM Part 312926-258 | Factory-calibrated W.C. (water column) rating | Single-pole, normally open contacts | 1/4" spade terminal connectors
• OEM vs Generic: OEM pressure switches are calibrated to exact water-column specifications for the Carrier CH13NA03100GAAAA. Off-brand substitutes often carry wider tolerance ranges, leading to nuisance lockouts or — more dangerously — failure to detect a true draft problem, creating a carbon monoxide risk.
• Install Difficulty: 2/5 — Power down and disconnect the unit before beginning. Tools needed: 1/4" nut driver, flat-head screwdriver, manometer (to verify W.C. rating post-install), and needle-nose pliers. Photograph hose routing and wiring before disconnecting. Inspect rubber pressure tubing for cracks or blockages while the switch is out — a blocked hose is a common root cause of switch failure.
• Warranty: 1-year OEM factory warranty on both switches. Orders ship same business day from our warehouse when placed before 3 PM local time.

Compatibility: This set is factory-matched to the Carrier CH13NA03100GAAAA. Always confirm both OEM part numbers (312926-252 and 312926-258) against your unit's wiring diagram or data plate before ordering. If you are only replacing one switch, each part is also available individually. Not sure which switch failed? Our HVAC parts team can help verify fitment and diagnose which switch to replace — contact us before you order.