Common Heating Issues and DIY Repairs 

heating repair

When the temperature drops in New Albany, Louisville, and across Southern Indiana, heating systems tend to get tested quickly. Many common heating issues show up at the worst time, usually on the coldest morning of the week. The good news is that some problems have simple explanations and safe checks homeowners can handle on their own.

This guide walks through the most common heating issues we see in Kentuckiana homes, what you can safely check yourself, and when it’s time to stop and call a professional. The goal is to help you avoid unnecessary stress while keeping safety front and center.

Safety First: What You Should and Shouldn’t DIY

Before troubleshooting any heating issue, safety comes first.

Power and gas precautions before any troubleshooting

Always start by turning the system off at the thermostat. If you plan to check breakers or panels, shut power off at the breaker as well. Never attempt to adjust gas valves, remove sealed panels, or bypass safety switches. If you smell gas or suspect a carbon monoxide issue, stop immediately and call a professional.

Tools that make basic checks easier

Most heating repair DIY checks only require simple tools:

  • Flashlight
  • Screwdriver
  • Fresh thermostat batteries
  • Clean air filter

If the fix requires electrical testing tools or internal components, it’s no longer a DIY task.

Furnace Won’t Turn On

A furnace that won’t start is one of the most frustrating common heating issues.

Thermostat settings and batteries

Start at the thermostat. Make sure it’s set to heat and the temperature is set above the current room temperature. Replace batteries if it’s a battery-powered thermostat. A thermostat that won’t turn on heat is often the root of the problem.

Breakers, switches, and filter checks

Next, check the circuit breaker and any nearby service switches. A tripped breaker or switched-off furnace can stop everything. Also check the air filter. A clogged filter can trigger safety shutoffs and prevent the furnace from starting.

If the furnace still won’t respond, schedule heating repair.

Furnace Blows Cold Air

Few things cause panic faster than a furnace blowing cold air.

Overheating resets and airflow issues

A dirty filter or blocked vents can cause the furnace to overheat and shut off the burners. The blower may keep running, pushing cool air. Replace the filter, open all registers, and give the system time to reset.

When the problem points to igniters or sensors

If cold air continues, the issue may involve the igniter or flame sensor. These are pro-only components. Furnace blowing cold air due to ignition problems requires a technician.

Short Cycling (Starts and Stops Frequently)

Furnace short cycling puts extra wear on the system and often signals airflow problems.

Filter, vents, and return airflow checks

Check the air filter first. Then make sure supply vents and return grilles aren’t blocked by furniture or rugs. Poor airflow is a leading cause of short cycling.

When to suspect pressure switches or sensors

If airflow looks good and cycling continues, pressure switches or flame sensors may be involved. These are not DIY fixes. At this point, call for professional furnace troubleshooting.

Strange Noises (Booms, Squeals, Rattles)

Heating systems make noise, but new or loud sounds usually mean trouble.

Loose panels, debris, and simple fixes

Rattling panels, screws, or debris near the unit can often be fixed by tightening hardware or clearing the area. Always turn power off first.

Inducer and blower issues

Squealing or grinding often points to motor or blower problems. Booming noises may indicate delayed ignition. These issues should not be ignored and require service.

Uneven Heating or Weak Airflow

Some rooms feel warm while others stay cold.

Register and duct basics you can inspect

Check that all registers are open and unobstructed. Clean visible dust from vents and returns. These steps help with airflow issues.

Signs of duct leakage or blockage

If problems persist, duct leakage or blockages may be present. Professional air duct cleaning or inspection may be needed to restore balance.

Pilot and Ignition Problems

Older systems and modern furnaces handle ignition differently.

What’s safe to check vs. pro diagnostics

You can verify the thermostat call and power supply. Do not attempt to relight sealed combustion systems or access ignition components. Furnace won’t ignite problems should be handled by a technician.

Heat Pump Not Heating in Cold Weather

Heat pumps behave differently than furnaces in winter.

Defrost cycle basics and outdoor checks

It’s normal for heat pumps to enter defrost mode, blowing cooler air briefly. Make sure the outdoor unit is clear of snow and debris.

When icing or refrigerant issues require service

Heavy ice buildup or poor heating performance may indicate low refrigerant or defrost control issues. These require professional service.

Preventive Steps to Avoid Winter Breakdowns

A few simple habits can reduce common heating issues.

Filter cadence, vent cleaning, and tune-ups

Change filters regularly, keep vents clear, and schedule seasonal heating maintenance. Professional maintenance catches problems before they turn into breakdowns and supports indoor air quality.

If your system is acting up or you’d rather not guess, schedule professional heating repair or maintenance today.

DIY Heating Troubleshooting Checklist (Printable)

  • Check thermostat settings and batteries
  • Replace clogged air filter
  • Confirm breakers and service switches
  • Open and clean vents and returns
  • Clear debris around furnace or heat pump
  • Listen for unusual noises

Keep this checklist handy during the winter months.

Need Help Now? Schedule Heating Repair or Maintenance

DIY checks can solve some issues, but they don’t replace professional care. When problems persist, expert service keeps your home safe and warm.

Greenwell has served New Albany, Southern Indiana, and Louisville, KY for over 30 years. With the 30 Minute Guarantee, you’ll always get a call ahead before we arrive. Schedule heating repair or heating maintenance today and get clear answers from local HVAC experts you can trust.