Call (516) 259-1191
    home+ — Home+ Air and Heat
    ES (516) 259-1191
    High Priority Issue

    Furnace Won't Turn On?

    When your furnace refuses to start, here's what could be wrong and when you need professional help.

    Get Same-Day Diagnosis (516) 259-1191

    Quick DIY Checklist (Try These First)

    Thermostat set to HEAT
    Temperature above room temp
    Thermostat batteries fresh
    Circuit breaker ON
    Furnace power switch ON
    Gas valve open

    Common Causes & Solutions

    Thermostat Issues

    Low PriorityDIY Fix

    Thermostat not set correctly, dead batteries, or malfunctioning.

    Solution: Check thermostat is set to HEAT, temperature is above room temp, and replace batteries if needed.

    Tripped Circuit Breaker

    Low PriorityDIY Fix

    The furnace's electrical circuit has tripped.

    Solution: Locate your electrical panel and reset the furnace breaker. If it trips again, call a professional.

    Furnace Switch Turned Off

    Low PriorityDIY Fix

    The power switch on or near the furnace is in the OFF position.

    Solution: Locate the switch (looks like a light switch) near your furnace and flip it to ON.

    Clogged Air Filter

    Low PriorityDIY Fix

    Severely clogged filter triggered safety shutdown.

    Solution: Replace the air filter and try restarting the furnace.

    Gas Valve Closed

    Medium PriorityDIY Fix

    The gas supply to the furnace has been shut off.

    Solution: Check that the gas valve handle is parallel to the gas line (open position).

    Ignition System Failure

    High PriorityCall Pro

    Electronic igniter or pilot light has failed.

    Solution: Professional diagnosis and repair of ignition components required.

    Flame Sensor Malfunction

    Medium PriorityCall Pro

    Dirty or failing flame sensor prevents ignition sequence.

    Solution: Professional cleaning or replacement of flame sensor.

    Control Board Failure

    High PriorityCall Pro

    The furnace's main control board has malfunctioned.

    Solution: Professional diagnosis and potential board replacement.

    When to Call a Professional

    • All DIY checks completed but furnace still won't start
    • Circuit breaker keeps tripping
    • You smell gas near the furnace
    • Error codes displayed on furnace
    • Furnace attempts to start but shuts down immediately

    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
    (516) 259-1191

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