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NO HEAT

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

Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace NO HEAT Error Fix: Furnace Not Producing Heat

The furnace is not heating despite a thermostat call. Systematic check: (1) Thermostat set to HEAT, temperature above room temp, fresh batteries. (2) Furnace power switch ON. (3) Circuit breaker ON. (4) Gas shutoff valve open (handle parallel to pipe). (5) Check IFC board LED for flash code. (6) Check the 3-amp fuse on the IFC board.

warning2 fixes available

Quick Answer

Error NO HEAT on the Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace means: Furnace Not Producing Heat. The top-ranked community fix is “Inspect IFC Board Fuse and Diagnostic Codes” (medium difficulty, ~40 min, DIY cost: $10-$20). 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: $120-$180.

Other Rheem Models with Error NO HEAT

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 NO HEAT

What does error code NO HEAT mean on a Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace?

Error code NO HEAT on the Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace means: Furnace Not Producing Heat. The furnace is not heating despite a thermostat call. Systematic check: (1) Thermostat set to HEAT, temperature above room temp, fresh batteries. (2) Furnace power switch ON. (3) Circuit breaker ON. (4) Gas shutoff valve open (handle parallel to pipe). (5) Check IFC board LED for flash code. (6) Check the 3-amp fuse on the IFC board.

How do I fix error code NO HEAT on my Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace?

The most successful fix is "Inspect IFC Board Fuse and Diagnostic Codes" (medium difficulty, ~40 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

Is error code NO HEAT on a Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace serious?

This error is rated warning 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 NO HEAT myself?

Yes — the top-ranked community fix ("Inspect IFC Board Fuse and Diagnostic Codes") is rated medium difficulty and takes about 40 minutes. Tools needed: T20 Torx screwdriver, Multimeter.

How much does it cost to repair Rheem Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace error NO HEAT?

DIY cost: $10-$20. Professional repair typically costs $120-$180. 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 NO HEAT error?

Error code NO HEAT 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 NO HEAT error?

Error code NO HEAT 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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