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    Performance Issue

    Furnace Short Cycling?

    Frequent on/off cycling wastes energy and stresses components. Here's what causes it and when to get help.

    Get Same-Day Diagnosis

    Common Causes & Solutions

    Dirty Air Filter

    DIY Fix

    Restricted airflow causes overheating and automatic shutdown.

    Solution: Replace the air filter and monitor for improvement.

    Thermostat Location Issues

    DIY Fix

    Thermostat near heat source or draft causes incorrect readings.

    Solution: Relocate thermostat or address heat source/draft.

    Overheating

    Call Pro

    Blocked vents, dirty components, or fan issues cause overheating.

    Solution: Professional inspection of heat exchanger and airflow.

    Oversized Furnace

    Call Pro

    Furnace too large for home heats quickly, shuts down, repeats.

    Solution: Professional assessment; may require system replacement.

    Flame Sensor Issues

    Call Pro

    Dirty or failing sensor doesn't detect flame properly.

    Solution: Professional cleaning or replacement.

    Faulty Control Board

    Call Pro

    Electronic controls malfunction causing erratic operation.

    Solution: Professional diagnosis and board replacement if needed.

    When to Call a Professional

    • Filter replacement didn't fix the issue
    • Cycling happens more than 3-4 times per hour
    • You notice uneven heating in your home
    • Energy bills have increased significantly
    • The furnace makes noise when cycling

    Diagnostic Visit — $199

    An EPA-certified technician inspects your system, identifies the issue, and applies the $199 fee toward any approved repair.

    EPA-Certified TechniciansSame-Day AvailableCredit Toward Repairs

    Related Issues

    Furnace Diagnostic HubBlowing Cold AirMaking Strange NoisesTroubleshooting Guide
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