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10 FLASH

Rheem · Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace

Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace 10 FLASH Error Fix: Rollout Switch Open

The flame rollout limit switch has tripped, indicating flames or extreme heat are escaping the burner compartment. This is a MANUAL reset device. Do NOT reset without first identifying the cause. The most dangerous cause is a cracked heat exchanger. Other causes: severely blocked vent or dirty/misaligned burners. Have a qualified technician inspect the heat exchanger with a combustion analyzer.

critical2 fixes available✨ Free fix available

Quick Answer

Error 10 FLASH on the Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace means: Rollout Switch Open. The top-ranked community fix is “Inspect and Replace the Rollout Switch or Repair Heat Exchanger” (hard difficulty, ~90 min, DIY cost: $50-$100). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · furnace

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many furnace repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $300-$600.

Other Rheem Models with Error 10 FLASH

Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace

furnace · 2 fixes

Other Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace Error Codes

1 FLASH

Normal — Heat Call Active

2 fixes

2 FLASH

System Lockout — Ignition Failed

2 fixes

3 FLASH

Pressure Switch Stuck Closed

2 fixes

4 FLASH

Pressure Switch Stuck Open

2 fixes

5 FLASH

Flame Sensed Without Gas Valve Command

2 fixes

6 FLASH

Power Reversed or No Ground

Low Flame Signal

Igniter Circuit Failure

2 fixes

People Also Ask About Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace Error 10 FLASH

What does error code 10 FLASH mean on a Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace?

Error code 10 FLASH on the Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace means: Rollout Switch Open. The flame rollout limit switch has tripped, indicating flames or extreme heat are escaping the burner compartment. This is a MANUAL reset device. Do NOT reset without first identifying the cause. The most dangerous cause is a cracked heat exchanger. Other causes: severely blocked vent or dirty/misaligned burners. Have a qualified technician inspect the heat exchanger with a combustion analyzer.

How do I fix error code 10 FLASH on my Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace?

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.

Is error code 10 FLASH on a Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace serious?

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

Can I fix Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace error 10 FLASH myself?

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).

How much does it cost to repair Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace error 10 FLASH?

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

What other error codes does the Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace have?

The Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace has 8 other known error codes, including: 1 FLASH (Normal — Heat Call Active), 2 FLASH (System Lockout — Ignition Failed), 3 FLASH (Pressure Switch Stuck Closed), 4 FLASH (Pressure Switch Stuck Open), 5 FLASH (Flame Sensed Without Gas Valve Command), and 3 more.

Which other Rheem models have the 10 FLASH error?

Error code 10 FLASH also appears on 1 other Rheem model: Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace have?

The Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace has 8 other known error codes:

1 FLASH — Normal — Heat Call Active (2 fixes)
2 FLASH — System Lockout — Ignition Failed (2 fixes)
3 FLASH — Pressure Switch Stuck Closed (2 fixes)
4 FLASH — Pressure Switch Stuck Open (2 fixes)
5 FLASH — Flame Sensed Without Gas Valve Command (2 fixes)
6 FLASH — Power Reversed or No Ground (2 fixes)
7 FLASH — Low Flame Signal (2 fixes)
8 FLASH — Igniter Circuit Failure (2 fixes)

Which other Rheem models have the 10 FLASH error?

Error code 10 FLASH also appears on 1 other Rheem model:

Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace (furnace) · 2 fixes

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