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The Kenmore furnace fails to ignite, producing no heat, or the blower runs continuously without ignition. Common symptoms include a completely dead unit, a flickering or non-existent pilot light, or the igniter failing to glow. These issues often point to problems with the thermostat, power supply, or critical ignition components.
You will need a multimeter for electrical testing, a screwdriver set for access panels, and a wire brush for cleaning. Replacement parts might include a new flame sensor ($20-$50), a hot surface igniter ($30-$80), or a control board ($150-$400). A shop vacuum can be useful for cleaning dust and debris from the furnace interior and vents.
Always disconnect all power to the Kenmore furnace at the circuit breaker and the furnace's dedicated power switch before beginning any inspection or repair. Be aware of potential gas leaks; if you smell gas, immediately evacuate the area, do not operate any electrical switches, and contact your gas company. Wear appropriate personal protective equipment, such as gloves and safety glasses, to prevent injury from sharp edges or electrical components.
A professional technician is required if the control board is faulty, as diagnosing and replacing this complex component demands specialized knowledge and tools. Issues involving the gas valve or heat exchanger, such as a cracked heat exchanger, are extremely dangerous and must only be addressed by a certified HVAC professional. If you suspect a refrigerant leak in an attached AC coil or if the furnace is still under warranty, a professional service call is recommended to ensure proper repair and warranty compliance.
This often indicates a problem with the ignition system, such as a dirty flame sensor or a faulty hot surface igniter. The blower might be running due to a safety lockout or a stuck limit switch.
The clicking sound is usually the igniter attempting to spark or the gas valve opening. Check for a clear path for the flame, ensure the gas supply is on, and inspect the igniter for damage or dirt.
Yes, a severely clogged air filter can restrict airflow, causing the furnace to overheat and trip a safety limit switch. This lockout prevents the furnace from starting until the filter is replaced and the system cools down.
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