AC Contactor Troubleshooting Guide – Dallas TX
The AC contactor is a critical electrical component inside your outdoor air
conditioning unit. When the thermostat calls for cooling, the contactor closes
and allows electricity to flow to the compressor and fan motor.
If the contactor fails, the air conditioner may not start even though the
thermostat is calling for cooling.
Common symptoms of a failing AC contactor include:
• Outdoor unit makes a clicking sound but does not start
• Condenser fan does not run
• Compressor does not start
• Air conditioner stops cooling
Signs Your AC Contactor May Be Bad
To test an AC contactor, technicians normally inspect the contact points for wear or burning.
Basic troubleshooting steps include:
• Turn off power to the AC unit
• Remove the condenser access panel
• Inspect the contactor contacts for damage
• Use a multimeter to verify voltage across the contactor
How to Test an AC Contactor
If the contactor contacts are burned or worn, the component should be replaced.
AC contactors are relatively inexpensive parts but are essential for proper operation of the air conditioning system.
WHEN TO REPLACE THE CONTACTOR
Dallas HVAC Parts in Garland carries a variety of AC contactors for residential and light commercial systems.
If you are unsure which contactor you need, bring the original part to our store and we will help you find the correct replacement quickly.
