A heating failure late at night can be especially difficult. Luckily, there are a number of simple things you can do to determine whether:

• The issue is a major repair
• It is something you can fix on your own.

Try these easy checks:

Check the Thermostat First

A furnace may not start due to a setting or power problem. Be sure it is set to “heat.” Set it higher than the room temperature.

If your thermostat runs on batteries, they could be dead. Replace them.

If the setting looks OK, but the furnace will not turn on. Then proceed to the furnace.

Examine the Furnace Filter

If the filter is dirty, it hinders air flow. This causes the furnace to operate harder. Sometimes, if airflow is limited, the system will turn itself off. This is a protective measure.

Do not run the furnace for extended periods of time on a filter that has become excessively dirty. This will impact the system’s performance. Clean or replace it ASAP.

Determine If the Furnace Power Is On

Your system requires power to run. Inspect the switch position and the circuit breaker. It could be tripped.

If so, reset it. If it trips again, don’t keep switching it back on. Call a qualified electrician. It could be a serious electrical issue.

Pay Attention to Sounds and Smells

Abnormal noises can help to determine what is going on inside the system. Beware of any:

• Banging
• Scraping
• Squealing
• Clicking sounds.

They indicate a mechanical or ignition issue.

Pay attention to the smell as well. A light, dusty odor at the start of the furnace after a period of rest could be normal. However, exercise more caution if:

• The burning odor is persistent
• It is accompanied by a strong odor of gas
• It is unusual.

Don’t attempt anything if you suspect a gas leak. Evacuate and follow your home emergency instructions.

Know When It Is an Emergency

Not all furnace issues will require immediate service. However, immediate attention is required if:

• Heat has stopped during extremely cold weather
• There is a suspected gas leak
• There are electrical problems
• There are symptoms of a major mechanical problem.

A basic check might not resolve the issue. In that case, seek an emergency furnace repair service.

Avoid DIY Repairs

Most homeowners can make simple adjustments or changes, like:

• Changing a filter
• Adjusting the thermostat
• Resetting a tripped circuit breaker.

That should be reasonable. More complex repairs are not the same. NEVER attempt to:

• Take apart gas parts
• Alter electrical wiring
• Override safety devices
• Repair ignition parts.

Call a professional with proper training.

A Summary

If your furnace is not working on a cold night:

• Try the easy troubleshooting steps
• Watch for warning signs
• Know when to give up.

This approach can help ensure the safety of your home and its occupants.