How To Check Ac Contactor

The AC contactor is an electrical switch that is used to control the flow of electricity to an AC motor. It is usually controlled by a thermostat or another device. The contactor can be checked by testing for continuity between the terminals.

How To Check Ac Contactor

There are a few ways to check an AC contactor. One is to use a voltmeter to measure the voltage across the contactor coil. Another way is to measure the resistance of the coil. If the resistance is low, it indicates that the coil is energized. Finally, you can use an ohmmeter to measure the resistance of the contacts. If the contacts are closed, there should be no continuity. If the contacts are open, there should be continuity.

-A volt/ohm meter -A screwdriver -A continuity tester

  • Check that the ac contactor is in the “on” position
  • Check that there is voltage present at the contactor terminals
  • Check the wiring between the contactor and the thermostat

-look for signs of wear like scorching, discoloration, or a burning smell -check the Contactor’s coil for continuity with a multimeter -check the Contactor’s wiring for any damage


Frequently Asked Questions

How Do You Troubleshoot A Contactor?

When troubleshooting a contactor, it is important to check the voltage at the coil and the amperage draw of the load. You should also check for any combustible material near the contactor that could cause a fire.

How Many Ohms Should An Ac Contactor Have?

An AC contactor should have a resistance of about 0.5 ohms.

How Do You Test An Ac Contactor With A Multimeter?

Testing an AC contactor with a multimeter is a process of checking the continuity of the circuit by placing the probes of the multimeter on either side of the contactor. If there is a break in the circuit, the multimeter will read continuity.


In Summary

There are a few things you can do to check an AC contactor. One is to use a continuity tester to check for continuity between the coil and the contacts. You can also test the resistance of the coil to make sure it’s within spec. Finally, you can use a voltage tester to make sure there is no electrical current flowing through the contacts when they’re supposed to be open.

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