Why is my contactor not engaging?

If the contactor is not getting the 24 volts to the coil, it could be a time delay relay, thermostat problem, transformer problem, safety control, wiring problem or a condensate pump, secondary drain pan safety switch problem.

How do I know if my magnetic contactor is bad?

Proceed to test the L-side with its corresponding T-side L-1 to T-1 with the red lead to the L-side and the black lead to the T-side. Check if the wirings read 0 ohms. If it does not, then that means that magnetic contact is bad and therefore the contact must be replaced.

How do I know if my contactor relay is bad?

Bad AC Contactor Symptoms

  1. The condenser unit never shuts off. This could be a sign that the contactor has melted, leaving the air conditioner with no means to block electricity.
  2. AC hums and won’t turn on.
  3. AC makes a chattering noise.

How do I reset my contactor?

The reset on those sometimes is like a circuit breaker, where the Trip is a mid-ground between Stop and Start, so to reset it you must push the Stop button first, then the Start button. If that doesn’t work, then you likely have an Under Viltage Coil on the starter and until it sees Viltage, it will not allow a reset.

Why am I not getting 24 volts to my contactor?

If the contactor is not getting the 24 volts to the contactor coil then it could be a time delay relay (if the unit is equipped), thermostat problem, transformer, safety control (low on refrigerate), or wiring problem. You can turn the power back on and set the thermostat so the system is calling for cooling (AC ON).

How do you energize a contactor?

~ The contactor can be de-energized by any device that can open the latching circuit. Examples of such devices are overload relays, shutdown timers, motor thermal overload sensors, inlet water pressure sensors, and high pressure switches (“auto-shutdown”).