Carrier Furnace Parts — Browse All Models

How to diagnose common Carrier furnace problems

Here are some furnace problems you might run into, and what to do about them.

• Won’t turn on. Check the house circuit breaker for the furnace to make sure it’s turned on. Reset the circuit breaker if it’s tripped. Carrier furnaces often have a cut-out switch that looks like a regular light switch located on or beside the furnace that shuts off electrical power to the furnace. Make sure that this cut-off switch is turned on. Low air flow can also prevent the furnace from working, so check the air filter and replace the filter if it’s clogged with lint. Check the pilot light if your furnace uses one to ignite the gas. Light the pilot if it’s out.
• Lack of air flow through the vents. A clogged air filter can prevent air from flowing through the vents, so replace the air filter if it’s clogged. If the filter isn’t clogged, a problem with the blower fan may be causing low air flow through the vents.
• Makes a lot of noise. Bearings in the blower fan can make loud squealing or screeching noise when the furnace runs. Replace the blower fan if its bearings make noise while the fan runs.

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Common Carrier furnace parts that need replacing

• Air filter. Replace the air filter monthly or as directed in your furnace’s owner’s manual. Replacing the air filter regularly helps keep the furnace running smoothly and helps the furnace last longer.
• Thermostat. The thermostat turns the furnace on and off. The thermostat can eventually wear out or break. Replace the thermostat if it doesn’t control temperature accurately or doesn’t turn on the furnace at all.
• Blower motor. The blower motor often runs for long periods without stopping. The bearings that support the motor shaft can wear out over time. Electrical problems inside the motor can also prevent the blower motor from running. Replace the blower motor if it doesn’t run or makes loud noises when running.

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