🔥Furnace

RAPID FLASH

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

Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace RAPID FLASH Error Fix: Control Board Failure

Continuous rapid flashing indicates an IFC board malfunction. Power cycle the furnace by turning off the circuit breaker for 30 seconds. If rapid flash continues, the IFC board must be replaced.

critical2 fixes available✨ Free fix available

Quick Answer

Error RAPID FLASH on the Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace means: Control Board Failure. The top-ranked community fix is “Replace IFC Control Board” (hard difficulty, ~90 min, DIY cost: $150-$250). 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-$450.

Other Rheem Models with Error RAPID 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

Rollout Switch Open

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

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

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

Error code RAPID FLASH on the Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace means: Control Board Failure. Continuous rapid flashing indicates an IFC board malfunction. Power cycle the furnace by turning off the circuit breaker for 30 seconds. If rapid flash continues, the IFC board must be replaced.

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

The most successful fix is "Replace IFC Control Board" (hard difficulty, ~90 minutes). Estimated DIY cost: $150-$250. HomeMD has 2 community-ranked fixes for this error.

Is error code RAPID 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 RAPID FLASH myself?

Yes — the top-ranked community fix ("Replace IFC Control Board") is rated hard difficulty and takes about 90 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Camera or phone for photos.

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

DIY cost: $150-$250. Professional repair typically costs $300-$450. 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), 10 FLASH (Rollout Switch Open), 2 FLASH (System Lockout — Ignition Failed), 3 FLASH (Pressure Switch Stuck Closed), 4 FLASH (Pressure Switch Stuck Open), and 3 more.

Which other Rheem models have the RAPID FLASH error?

Error code RAPID 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)
10 FLASH — Rollout Switch Open (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)

Which other Rheem models have the RAPID FLASH error?

Error code RAPID 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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