OEM Payne High & Low Pressure Switch for Model PA10JA048000AAAA

These OEM pressure switches are the factory-specified replacements for the Payne PA10JA048000AAAA packaged air conditioning and heating unit. The pressure switch proves that the inducer motor has established adequate draft before allowing the ignition sequence to proceed. When either the high-pressure switch (HK02ZA395) or low-pressure switch (HK02ZB028) fails, the control board cannot confirm safe venting conditions and will lock out the system — typically resulting in a no-heat fault with the inducer running but no spark or gas flow.

• Specs: High Pressure Switch — OEM Part HK02ZA395 | Low Pressure Switch — OEM Part HK02ZB028 | Rated water column (W.C.) pressure matched to factory spec | Normally-open diaphragm-style switch | 24V control circuit compatible
• OEM vs Generic: OEM Payne pressure switches are calibrated to the exact W.C. rating required by the PA10JA048000AAAA. Aftermarket switches frequently ship with incorrect trip points, causing nuisance lockouts or — worse — allowing operation under unsafe draft conditions.
• Install Difficulty: 3/5 — Requires disconnecting 24V signal wires and rubber vacuum hose from the inducer port. Tools needed: flathead screwdriver, needle-nose pliers, multimeter (to confirm open/closed state), and a manometer if verifying W.C. rating. Always confirm inducer hose is free of condensate blockage before replacing the switch.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Designed specifically for the Payne PA10JA048000AAAA 4-ton packaged unit. Verify which switch — high (HK02ZA395) or low (HK02ZB028) — has failed using a multimeter before ordering. Both switches are available individually. If you are unsure which part you need, our HVAC parts specialists will verify fitment before your order ships.