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    socjuad's Avatar
    socjuad Posts: 1, Reputation: 1
    New Member

    Mar 2, 2008, 07:30 AM
    Furnace shuts off before reaching thermostat setting
    I own a Clare furnace model CHU 072 NH3A that runs for three minutes then shuts down for five minutes then restarts again.

    It has a primary limit switch and a burner limit switch. Any help would be appreciated.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert

    Mar 2, 2008, 09:01 AM
    Check for dirty filter. Open all registers to prevent heat backup.
    If this fails post back.

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