Pelion, SC Heating System Repairs: 5 Common Causes & Fixes

Estimated Read Time: 9 minutes

If your heater not working has you shivering, you’re not alone. Columbia nights can dip into the 30s, and a cold house gets uncomfortable fast. This guide explains the top five causes of a heater not working, simple safe checks you can do today, and when to call a pro. Bonus: limited‑time savings on repairs for qualifying jobs. Let’s get your heat back on.

1) Thermostat Issues and Power Problems

A surprising share of “heater not working” calls come down to simple control or power issues. Before you assume a major breakdown, rule out the basics.

What to check first

1. Confirm mode and setpoint. • Heat mode on, fan set to Auto, and temperature set at least 3–5 degrees above room temp.
2. Replace thermostat batteries. • Many wall stats lose power and fail silently. Fresh batteries often restore control.
3. Verify breaker and switch. • Inspect your HVAC breaker at the main panel and the furnace/air handler service switch. Reset once if tripped.
4. Check the door safety switch. • Many furnaces will not run if the blower door is not seated properly.

When to DIY vs. call • DIY: Settings, batteries, and a single breaker reset. • Call a pro: Repeated breaker trips, a blank smart thermostat with correct wiring, or new thermostat installs that need configuration.

Why it matters Control errors lock out heat calls and waste energy. A correctly configured thermostat, ideally paired with a programmable or smart model, can cut heating costs while restoring comfort.

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2) Dirty Filters and Airflow Restrictions

If the system runs but blows weak or cool air, you may have restricted airflow. In the Midlands, dust and pollen load filters fast, especially during fall leaf drop.

What to check first

1. Inspect and replace the filter. • If it looks gray, caked, or past 60–90 days, replace it. Follow the airflow arrow when installing.
2. Open supply and return vents. • At least 80% of vents should remain open to prevent overheating and limit strain on the blower.
3. Look for crushed ducts or closed dampers in the attic or crawlspace.

When to DIY vs. call • DIY: Filter swaps and vent adjustments. • Call a pro: Repeated high‑limit trips, short cycling, or visible duct damage. Professional static pressure testing and duct repairs restore safe airflow.

Why it matters Low airflow can overheat a gas furnace or freeze a heat pump’s indoor coil. Either condition cuts efficiency and risks component failure.

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3) Ignition, Pilot, or Fuel Supply Failures (Gas Furnaces)

For gas furnaces, ignition faults are a common reason your heater is not working. The culprit could be a dirty flame sensor, a weak igniter, a stuck gas valve, or a failed control board. Fuel supply issues, such as a closed gas cock, also stop heat.

Safety first • Do not attempt gas repairs yourself. The manufacturer and safety codes require licensed service for gas components. If you smell gas, evacuate and call your utility.

What to check first

1. Thermostat call confirmed, door closed, filter clean.
2. Observe the start‑up sequence through the viewing port. • Inducer motor → igniter glow/spark → gas valve opens → flame establishes.
3. If the igniter glows but there’s no flame, the flame sensor may be dirty or the gas supply off.

When to DIY vs. call • DIY: None beyond basic checks and ensuring the gas shutoff handle is parallel to the pipe. Do not clean or adjust combustion parts. • Call a pro: Any no‑heat with error codes, repeated retries, or intermittent flames. Our technicians inspect thermostats, ignition switches, pilot assemblies, filters, and ducts, then restore safe operation.

Why it matters Faulty ignition wastes gas and stresses the furnace. Professional cleaning and calibration reduce failures and keep warranties valid.

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4) Heat Pump in “AC Mode,” Defrost, or Cold‑Weather Misuse

In mild Columbia winters, many homes rely on heat pumps. A heat pump that “blows cool” may be stuck in the wrong mode, in defrost, or limited by outdoor temperature.

What to check first

1. Confirm Heat mode and an adequate setpoint.
2. Check the outdoor unit. • Light steam and a temporary pause can mean normal defrost. It will resume in a few minutes.
3. Verify auxiliary heat. • When temps drop, electric heat strips or a furnace should assist. If the AUX light never comes on in cold weather, there may be a control issue.

When to DIY vs. call • DIY: Mode correction, thermostat schedule fixes, and filter changes. • Call a pro: Ice build‑up, loud grinding, or repeated short cycling. Professional service may clean coils, test refrigerant charge, and verify heat strip operation.

Why it matters Properly tuned heat pumps deliver efficient heat. Dirty coils, low charge, or failed strips force longer run times and higher bills.

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5) Lack of Maintenance and Safety Lockouts

Annual maintenance prevents most heater failures. Modern systems monitor themselves and can lock out if sensors detect abnormal temperatures, pressures, or flames.

What maintenance includes

1. Full system inspection and performance checks.
2. Cleaning vital parts and providing filter guidance.
3. Safety tests, electrical measurements, and combustion analysis on gas units.
4. Actionable advice tailored to your home and usage.

Why it matters • Maintains manufacturer warranty requirements. • Cuts energy use and extends equipment life. • Catches small problems before they become emergency repairs.

When to DIY vs. call • DIY: Keep filters fresh and vents open, and visually check that the outdoor unit is clear of leaves. • Call a pro: If your system locks out, shows an error code, or trips a breaker. We provide 24/7 emergency diagnostics and repairs with no after‑hours fees for maintenance customers.

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Quick Fix Flowchart You Can Follow Today

1. Thermostat and power • Heat mode on, new batteries, breaker reset once, furnace switch on.
2. Airflow • Replace dirty filter, open vents, clear returns, check for crushed ducts.
3. Equipment type • Gas furnace: stop and call for ignition or fuel issues. • Heat pump: wait through defrost; if persistent cool air, schedule service.
4. Still no heat? • Photograph any error codes and call for same‑day help.

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When To Repair vs. Replace

Repair makes sense when

1. The unit is under 10–12 years old.
2. The failure is minor, such as a capacitor, igniter, or sensor.
3. Your energy bills and comfort levels are otherwise normal.

Consider replacement when

1. Frequent breakdowns occur, or major components fail.
2. The system is 12–15+ years old and uses obsolete parts.
3. You want efficiency upgrades, better filtration, or smart controls.

What you gain with a new system • Higher efficiency, quieter operation, and advanced features like programmable thermostats and improved filtration. Our team will guide you to the ideal furnace or heat pump sized to your home and comfort needs, with free written estimates and financing options.

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Why Homeowners in Columbia Choose Kaminer

You want a heater fix that lasts, not a band‑aid. Here’s how we deliver:

1. Experience you can trust • Family‑owned, third generation, serving the Midlands since 1956 with an A+ BBB rating.
2. True availability • 24/7 emergency heating repair. No after‑hours fees for maintenance customers.
3. Strong guarantees • 100% satisfaction. Repairs done right the first time or the repair is free, and if a covered repair fails within a year, we fix it at no charge.
4. One‑stop service • We service all brands and handle ductwork, thermostats, and indoor air quality for complete comfort.

Service area • Columbia, Lexington, Irmo, West Columbia, Cayce, Blythewood, Elgin, Leesville, Winnsboro, and Gaston.

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What To Expect at Your Service Visit

1. Free written estimate before work begins.
2. Clear diagnosis and options, including repair and energy‑efficient upgrades.
3. Respectful pros who protect your home and explain everything in plain language.
4. Follow‑through: documented checklist, performance measurements, and warranty support.

Most visits restore heat the same day. If replacement is smarter, we measure the home, size equipment correctly, and handle permits and code compliance.

Special Offers for Heating Repairs

• Save $25 on any qualifying service repair totaling $250 or more. Call (803) 888-4115 to claim your savings. • Free written estimates on all services. Visit https://www.kaminerhac.com/ or call (803) 888-4115 to schedule. • 100% satisfaction guarantee on repairs. If we do not fix it right, the repair is free. If a covered repair fails within a year, we repair it at no charge.

What Homeowners Are Saying

"Nick did a good job of letting me know of his time of arrival, and he worked professionally as he maintained our heating system. He was helpful in sharing how we can regulate the system. He took care and did a great job."
–Columbia homeowner

"Michael showed up timely on a Sunday morning to diagnosis the issue with my furnace. He recommend and provided several options."
–Lexington homeowner

"This was the first time that I have used Kaminer. The HVAC techs Nick & Rakeem arrived on time to perform annual maintenance on my gas furnace... They completed the service quickly and provided a complete checklist of the work performed and any measurements taken."
–Irmo homeowner

"Kaminer is an excellent HVAC service. When I needed a new heat pump they measured the house volume and all of the registers and returns, which most contractors don't do. The unit they installed works really well... They have kept all service appointments."
–West Columbia homeowner

Frequently Asked Questions

Why is my heater running but not heating the house?

Restricted airflow or wrong thermostat settings are common. Check the filter, open vents, and confirm Heat mode. If airflow is fine, schedule a diagnostic to check ignition or heat strips.

Is it safe to relight a gas furnace or clean the flame sensor myself?

No. Gas repairs and combustion adjustments must be handled by licensed pros. If you suspect a gas issue, turn the system off and call for service.

How often should I change my heater filter?

Every 60–90 days for most homes, more often with pets, allergies, or heavy dust. Check monthly during peak use and replace when visibly dirty.

Do maintenance plans really help prevent breakdowns?

Yes. Annual service satisfies many manufacturer warranty requirements, reduces energy bills, and catches small issues before they fail.

How fast can you get my heat back on?

We offer true 24/7 emergency service in Columbia and nearby cities. Many no‑heat calls are restored the same day, often on the first visit.

The Bottom Line

A heater not working usually traces to thermostat settings, airflow, ignition, heat pump controls, or overdue maintenance. Tackle the safe checks above, then call our team for fast, guaranteed repairs.

Ready to Get Warm Again?

Call Kaminer Heating And Cooling at (803) 888-4115, schedule at https://www.kaminerhac.com/, or chat online. Columbia and nearby homeowners can claim $25 off qualifying repairs of $250+. Free written estimates. 24/7 emergency response. We will restore your comfort, guaranteed.

Call now: (803) 888-4115 • Schedule online: https://www.kaminerhac.com/ • Claim $25 off qualifying repairs of $250+ today.

About Kaminer Heating And Cooling

Since 1956, our third‑generation, family‑owned team has kept Midlands homes comfortable. We’re A+ rated by the BBB, offer a 100% satisfaction guarantee, and provide true 24/7 emergency service. Our licensed technicians receive continuous training and service all brands. Free written estimates, financing options, and no after‑hours fees for maintenance make it easy to get the right solution the first time.