Rheem Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace 10 FLASH Error Fix: Rollout Switch Open

Error code 10 FLASH on the Rheem Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace means: Rollout Switch Open. The flame rollout limit switch has tripped, indicating flames or extreme heat are escaping the burner compartment or heat exchanger. The rollout switch is a safety device mounted near the burner opening that detects temperatures well above normal operating range. When tripped, it opens the circuit and shuts down the furnace. This is a MANUAL reset device — it has a small button that must be pressed to reset. CRITICAL: Do NOT reset without first identifying the cause. The most dangerous cause is a cracked heat exchanger, which can allow combustion gases including carbon monoxide into the living space. Other causes include a severely blocked vent, a blocked return air duct (causing recirculation of flue gases), or dirty/misaligned burners. Have a qualified technician inspect the heat exchanger with a combustion analyzer and visual/camera inspection.

The most successful fix is "Inspect and Replace the Rollout Switch or Repair Heat Exchanger" (hard difficulty, ~90 minutes). Estimated DIY cost: $50-$100. HomeMD has 2 community-ranked fixes for this error.

This error is rated critical severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Inspect and Replace the Rollout Switch or Repair Heat Exchanger") is rated hard difficulty and takes about 90 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Combustion analyzer (optional).

DIY cost: $50-$100. Professional repair typically costs $300-$600. Many homeowners save money by trying the top-ranked community fix first.

The Rheem Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace has 8 other known error codes, including: 1 FLASH (Normal — Heat Call Active), 11 FLASH (High-Stage Pressure Switch Open (Two-Stage Only)), 2 FLASH (System Lockout — Ignition Failed), 3 FLASH (Pressure Switch Stuck Closed), 4 FLASH (Pressure Switch Stuck Open), and 3 more.

Error code 10 FLASH also appears on 1 other Rheem model: Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace. The fix may vary by model, so check each model's specific page for tailored repair steps.