How to Reset a Rheem Furnace (With Step-by-Step Instructions)

Quick Answer:
To reset a Rheem furnace, turn off power at the switch or breaker, wait 30–60 seconds, then restore power. Press the reset button once if present. If the furnace shuts down again, the issue is not fixed and requires diagnosis.

Introduction

If your Rheem furnace stops working, the first thing most homeowners try is a reset.

Sometimes that works.

Sometimes it doesn’t—and repeated resets can actually make the problem worse.

This guide is based on real service experience across Ohio and walks you through:

• How to safely reset your Rheem furnace
• When a reset will actually fix the issue
• When you should stop and address the real problem

How do you reset a Rheem furnace?

Quick Answer:
Turn off power to the furnace, wait at least 30 seconds, then turn it back on. If equipped, press the reset button once. Do not repeatedly reset, as this can damage components or hide underlying issues.

Step-by-step reset process:

1. Turn off power
   • Use the furnace switch or breaker
2. Wait 30–60 seconds
   • Allows control board to fully reset
3. Turn power back on
   • Listen for startup sequence
4. Locate reset button (if applicable)
   • Press once only
5. Observe operation
   • Normal ignition cycle should begin

General system guidance from the U.S. Department of Energy:
https://www.energy.gov/energysaver/home-heating-systems

Where is the reset button on a Rheem furnace?

Quick Answer:
The reset button is typically inside the blower compartment or near the burner assembly. Many modern Rheem furnaces reset automatically when power is cycled.

Typical locations include:

• Near the blower motor
• Close to the burner assembly
• Inside the lower access panel

If no button is visible, your system likely uses automatic reset logic.

Manufacturer reference:
https://www.rheem.com/support/

Why does a Rheem furnace need to be reset?

Quick Answer:
A Rheem furnace resets when it detects a safety issue such as overheating, ignition failure, or airflow restriction. Resetting clears the fault but does not fix the cause.

Common causes:

• Dirty air filter
• Flame sensor issues
• Ignition failure
• Blocked vents
• Electrical interruption

ENERGY STAR guidance:
https://www.energystar.gov/products/heating_cooling

NFPA safety standards:
https://www.nfpa.org/

What a reset does NOT fix

Quick Answer:
A reset does not fix underlying mechanical or airflow problems. It only clears the fault temporarily. If the furnace shuts down again, the root issue still needs repair.

A reset will NOT fix:

• Dirty air filters
• Blocked ductwork
• Failing flame sensors
• Ignition problems
• Limit switch failures

Most furnace resets that “work” are only masking a problem that will come back.

When should you NOT reset your furnace?

Quick Answer:
Do not reset your furnace repeatedly. If it shuts down more than once, resetting can damage components or create safety risks.

Stop immediately if:

• Furnace shuts off again after reset
• You smell gas
• You hear unusual noises
• The system short cycles

Gas safety guidance:
https://www.cpsc.gov/Safety-Education/Safety-Education-Centers/Gas-Safety

CDC carbon monoxide safety:
https://www.cdc.gov/co/faqs.htm

What actually causes repeated furnace shutdowns?

Quick Answer:
Repeated shutdowns are usually caused by airflow problems, overheating, or ignition failure. These require diagnosis—not repeated resets.

Most common causes:

• Dirty air filters
• Blocked return ducts
• Flame sensor buildup
• Limit switch trips

Even a moderately clogged filter can reduce airflow by 15–20%, which is enough to trigger a safety shutdown.

U.S. Department of Energy:
https://www.energy.gov/energysaver/home-heating-systems

ASHRAE guidance:
https://www.ashrae.org/

If you're dealing with repeat shutdowns, this is usually part of a larger issue.
(Read more: /blog/common-furnace-problems) ← replace with your real internal link

What actually matters in Steubenville, Weirton, and surrounding areas

Quick Answer:
Older homes, basement installations, and ductwork issues make airflow problems more common, leading to furnace shutdowns.

In local homes, we regularly see:

• Older duct systems restricting airflow
• Basement installations limiting return air
• High dust environments clogging filters faster

In Mingo Junction and Toronto, undersized return ducts can reduce airflow enough to trigger shutdown—even when the furnace itself is fine.

Is it safe to reset your furnace yourself?

Quick Answer:
Yes, one reset is safe if done correctly. Repeated resets are not safe and can damage the system or hide serious issues.

Safe if:

• Done once
• No unusual smells
• System resumes normal operation

Not safe if:

• System repeatedly shuts down
• Electrical issues occur
• Gas odor is present

Who should NOT try resetting their furnace?

Quick Answer:
Homeowners experiencing repeated shutdowns, gas smells, or electrical issues should not attempt resets.

Do NOT reset if:

• You smell gas
• Breaker keeps tripping
• Furnace shuts down repeatedly
• You don’t know the cause

Final Answer: Should you reset your Rheem furnace?

Quick Answer:
Reset your Rheem furnace once after a minor shutdown. If the issue returns, stop resetting and identify the cause. Repeated resets indicate a deeper problem.

A reset is temporary.

It restores operation.

It does not fix the problem.