(516) 259-1191 (516) 345-3911 (516) 548-0911
    home+ — Home+ Air and Heat
    24/7 Emergency(516) 259-1191
    Urgent Issue

    Boiler Not Producing Heat?

    When your boiler runs but doesn't produce heat or hot water, here's what might be wrong and when to call for help.

    5.0(66 reviews)
    Same-Day Service
    NATE Certified

    Common Causes & Solutions

    Thermostat Issues

    DIY Fix

    Thermostat set incorrectly or malfunctioning.

    Solution: Check thermostat is set to heat mode and temperature is above room temp.
    Estimated Cost: $0 (DIY) or $150-$300 for thermostat replacement

    Pilot Light Out

    DIY Fix

    Pilot light has gone out and needs to be relit.

    Solution: Follow manufacturer instructions to relight pilot. If it won't stay lit, call a professional.
    Estimated Cost: $0 (DIY) or $150-$250 for thermocouple replacement

    Low Water Pressure

    DIY Fix

    System pressure too low for proper operation.

    Solution: Check pressure gauge—should be 12-15 psi. Use fill valve to add water if needed.
    Estimated Cost: $0 (DIY) or $200-$400 if expansion tank replacement needed

    Frozen Condensate Pipe

    DIY Fix

    Condensate drain frozen in cold weather (condensing boilers).

    Solution: Pour warm (not boiling) water over frozen section of pipe.
    Estimated Cost: $0 (DIY) or $150-$300 for pipe insulation installation

    Circulator Pump Failure

    Call Pro

    Pump not circulating water through the system.

    Solution: Professional diagnosis and pump repair or replacement.
    Estimated Cost: $400-$800 for pump replacement

    Gas or Oil Supply Issue

    Call Pro

    Fuel supply interrupted or valve closed.

    Solution: Professional inspection of fuel supply and gas valve.
    Estimated Cost: $150-$500 depending on issue

    No Heat in Nassau County Homes

    Many older homes in Levittown, Hicksville, and Garden City have original boiler systems from the 1950s-1970s. These aging systems are more prone to circulation problems during cold snaps. If your home has radiator heat, a complete loss of heat often indicates a pump or zone valve issue rather than the boiler itself.

    When to Call a Professional

    • DIY fixes didn't resolve the issue
    • You smell gas near the boiler
    • Error codes are displayed
    • Problem keeps recurring
    • Boiler is making unusual noises

    Diagnostic Visit — $199

    A licensed technician inspects your system, identifies the issue, and applies the $199 fee toward any approved repair.

    Licensed TechniciansSame-Day AvailableCredit Toward Repairs

    Frequently Asked Questions

    Why is my boiler running but not producing heat?

    The most common causes are a failed circulator pump, zone valve malfunction, or low water pressure. Your boiler may be firing correctly but unable to move the heated water through your radiators.

    How long can I go without heat before pipes freeze?

    In Nassau County winters, pipes can begin freezing within 4-6 hours if indoor temperatures drop below 32°F. Keep your thermostat at 55°F minimum and open cabinet doors under sinks if you lose heat.

    Is no heat considered an emergency?

    Yes, especially in winter. We offer 24/7 emergency service with 90-minute response times throughout Nassau County. Call (516) 259-1191 for immediate assistance.

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