Gas Furnace Not Heating? Troubleshooting Tips

Before you call for furnace repair, it’s worth checking a few common issues that may prevent your system from producing heat. Many problems have quick fixes you can do yourself, which may save you the cost of an unnecessary service call. Try these steps if you’re in Mattoon, Charleston, Effingham, or anywhere across East Central Illinois.

1. Check thermostat settings

Verify the thermostat is set higher than your current room temperature. The system mode should be on HEAT (or AUTO if you want it to cycle automatically). For the fan, use ON for constant circulation or AUTO to run only when the furnace is operating. Raise the thermostat to its highest setting to test if the system activates.

2. Inspect the air filter

If airflow feels weak, check the filter. A clogged or dirty filter can block warm air from moving through your system. Replace it if needed.

3. Confirm registers and vents are open

Walk through your home to make sure all supply registers are open and not blocked by rugs, curtains, or furniture.

4. Verify the power disconnect

The furnace has a nearby power switch. Confirm that it’s turned on.

5. Check your breaker panel

Inspect your home’s electrical panel to confirm the breaker for the furnace is ON. Reset it if it has tripped.

6. Make sure the gas supply is open

Check the gas control valve to ensure it’s in the open position so your furnace has fuel to operate.

7. Inspect the pilot light (if applicable)

Older furnaces may have a pilot light. Make sure it’s lit. If your furnace uses an electronic ignition, it won’t have a pilot light to check.

If your furnace still isn’t heating after these steps, it’s time to call in the professionals. At Atteberry & Marshall, we provide reliable furnace repair and heating service for homeowners in Mattoon, Charleston, Effingham, and across East Central Illinois.

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