HVAC Fan Problems? Here’s Why

HVAC Fan Problems? Here’s Why

When you consider that the cooling and heating system in an average home circulates over 1,500 cubic feet of conditioned air every minute, it’s no surprise that HVAC fan problems may occasionally occur. Without a fully functional system blower fan, all the air conditioned comfort you expect in summer—not to mention the cozy winter warmth, too—goes nowhere. Located in the system’s central air handler, the typical fan lasts many years, provided it receives proper annual preventive maintenance by a qualified professional. When HVAC fan problems do arise, however, here are some typical examples of what might go wrong:

Loose belt. 

A blower fan belt that has lost tension due to stretching (or broken entirely) will no longer rotate the blower. In addition to loss of air circulation, you may hear squealing or squeaking sounds as a loose belt slips on the pulley. These sounds are often amplified as they pass through the ductwork throughout the house so it’s hard to miss. An HVAC service tech can remove the bad belt, install a new one and tighten it to specs.

Dust accumulation.

Thick dust coating the surfaces of the blower fan greatly reduce fan efficiency and lower the volume of air circulating through the ducts. Cleaning requires accessing the fan enclosed in the air handler and thoroughly removing all dust. The homeowner can help prevent recurrence by changing the system air filter monthly during the cooling season and at least every other month during the winter.

Motor failure.

After years of service, the system blower fan motor may fail due to normal wear and tear. Replacement is not a DIY fix and requires a qualified service technician with the tools to do the job correctly and properly adjust belt tension after the new motor is installed.

Thermostat defect.

The thermostat signals air conditioner or furnace components to start and energizes the system fan. A defective thermostat, or associated wiring issue, may prevent proper system actuation including the fan.

For qualified, experienced service to resolve HVAC fan problems, contact the professionals at Powers Heating & Air.

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