How to Repair Electric Furnaces


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  • Troubleshooting Electric Furnaces and Electric Heaters

    Although major problems will require professional help, there are many quick-fix jobs that a homeowner can do to get his or her electric furnace operating properly again. Use this chart if your furnance is not working properly.

    Problem Possible cause Solution
    Furnace won't run

    1. No power.

    1. Check for blown fuses or tripped
    circuit breakers at main entrance
    panel, at separate entrance panel,
    and on or in furnace; restore circuit.

    2. Switch off.
    2. Turn on separate power switch
    on or near furnace.

    3. Motor overload.
    3. Wait 30 minutes; press reset
    button. Repeat if necessary.
    Not enough heat

    1. Thermostat set
    too low.
    1. Raise thermostat setting 5°.

    2. Filter dirty. 2. Clean or replace filter.

    3. Blower clogged. 3. Clean blower assembly.

    4. Registers closed
    or blocked.
    4. Make sure all registers are open;
    make sure they are not blocked
    by rugs, drapes, or furniture.

    5. System out of
    5. Balance system.

    6. Blower belt loose
    or broken.
    6. Adjust or replace belt.

    7. Element faulty. 7. Call a professional.
    Furnace turns
    on and off
    1. Filter dirty.
    2. Motor and/or
    blower needs
    1. Clean or replace filter.
    2. If motor and blower have oil
    ports, lubricate.


    3. Blower clogged. 3. Clean blower assembly.
    Blower won't
    stop running
    1. Blower control
    set wrong.
    1. Reset thermostat from ON
    to AUTO.

    2. Relays faulty. 2. Call a professional.
    Furnace noisy
    1. Access panels
    1. Mount and fasten access
    panels correctly.

    2. Belts sticking, worn,
    or damaged.
    2. Spray squeaking belts with
    fan belt dressing; replace worn
    or damaged belts.

    3. Blower belt too
    loose or too tight.
    3. Adjust belt.

    4. Motor and/or blower
    needs lubrication.
    4. If motor and blower have oil
    ports, lubricate.

    Many electric furnaces are fused separately from the rest of the home. Learn where to find the fuses for the electric furnace on the next page.

    For more articles on home repair, check out the following links.
    • Furnace Maintenance: Save yourself time and money by learning the steps to keep youor furnace in prime condition.
    • Major Appliance Repair: If the furnace isn't the only thing in your house on the fritz, you can learn how to fix other machines in this article.
    • Small Appliance Repair: Once you've tackled the furnace, a toaster or blender seems like child's play. Find out how to fix them here.
    • Thermostat Maintenance: To make sure there's actually a problem with your heating system, you may want to check the thermostat, too. Learn how to calibrate a thermostat.
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