Aaon P21460 200°F Rollout Switch Manual Reset High Limit OEM Replacement

The Aaon P21460 is an OEM 200°F rollout switch (flame rollout limit switch) designed as a direct replacement for AAON commercial and industrial HVAC heating equipment. This critical safety component monitors temperatures near the burner assembly and shuts down the heating system if dangerous flame rollout conditions are detected, protecting both equipment and occupants from fire hazards and carbon monoxide exposure.

Key Features:

• 200°F trip temperature — activates and interrupts the control circuit when the surrounding temperature reaches 200°F
• Manual reset design — requires deliberate technician intervention to restore operation after tripping, providing an additional layer of safety accountability
• OEM replacement part — genuine AAON component engineered for direct fit and full compatibility with AAON HVAC equipment
• SPST (Single-Pole Single-Throw) control circuit switch — integrates into the furnace control loop to interrupt gas valve and ignition signals upon activation
• Also referenced as: SWITCH FSTAT 200 EXP 0.38 MR, high limit switch L200, flame rollout safety switch

The P21460 rollout switch is mounted near the burner box and serves as a last-line-of-defense safety device. When flame rollout occurs — caused by conditions such as blocked venting, restricted airflow, or dirty burners — the switch trips open, cutting power to the gas valve and ignition system and halting furnace operation. The manual reset requirement ensures a qualified HVAC technician investigates and resolves the underlying cause before the system is returned to service. This is a direct OEM AAON part covered by the manufacturer's warranty.