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This is the exact Payne part HH18HA285 installed at the factory in the PA10EA060000AAAA — not a will-fit substitute. Fitment guaranteed — free returns if it doesn't fit.
| Setpoint | 65-85F |
| Reset | Auto |
| Type | low-temp temperature-actuated switch (auto-reset) |
| Note | 65-85F Auto confirmed on multiple distributors. This is a LOW-temp switch (RepairClinic classes it under Heat Pump Temperature Switch), NOT a furnace high-limit L-number despite the HH18HA prior. Open-vs-close-on-rise action not corroborated by 2 domains -> left unasserted. |
| OEM Part Number | HH18HA285 |
| Brand | Payne |
| Condition | New — genuine OEM |
Watch for: Error codes tracing to this component, the system short-cycles or locks out, performance that degrades under load. Catching it early protects the components around it.
Swap the part, torque fasteners evenly, and route wires away from hot or moving surfaces. Run a complete cycle and verify normal operation before closing the panel.
Is this the exact OEM part for my PA10EA060000AAAA? Yes — verified factory fitment for that model.
Not sure of your model? Chat with Mike with the number from your unit's nameplate and we'll confirm before you order.