Your Guide to Solving Common HVAC Fan Problems

HVAC fan problemsIf you’ve got HVAC fan problems, you probably already know the signs. No matter how effectively your central air conditioner functions, all that cool comfort goes nowhere if the system blower fan’s not operating up to specs. Household comfort declines, indoor air quality suffers and other system components may be subjected to excess wear and tear.

Here are some typical examples of common HVAC fan problems and how they’re handled by a qualified professional.

Blower drive belt slips.

The blower in the HVAC air handler is usually belt-driven and requires a functioning belt, tightened to proper tension. Belts often stretch over years of operation and may slip on the turning drive pulley, causing air circulation to decline. You may hear squeaking and squealing sounds that accompany this slippage—or not.  An HVAC service tech can install a new belt, adjust to proper tension and perform other routine service such as lubricating moving parts in the blower system.

Dust accumulation on fan.

Dirt and dust particles that coat blower fan blades gradually impair efficiency and diminish airflow. Often, you will hear the fan motor running normally, but cool or heated air circulation feels weak. A complete cleaning of the fan and other affected blower components brings fan efficiency back to specifications. Homeowners can do their part to keep blower fans clean and effective by installing a new air filter regularly.

Fan motor burned out.

You can count on anywhere from 10 to 20 years of blower fan life expectancy, depending on daily hours of operation and routine upkeep such as regular filter changes.  Eventually, wear and tear takes its toll and the motor no longer functions. Most motor failures are non-repairable issues and replacement by a qualified HVAC technician is the next step.

Thermostat issues.

If the thermostat fan switch is defective, or wiring to the unit isn’t functional, the HVAC fan won’t receive the signal to start. This requires professional troubleshooting to identify potential thermostat or wiring issues.

For a professional opinion about HVAC fan problems, contact the experts at NisAir Air Conditioning and Heating.

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