Refrigeration & Air Conditioning Mechanic Red Seal · Question
When troubleshooting a contactor that fails to energize, what is the FIRST component to check after ensuring control voltage is present at the coil terminals?
If control voltage is present at the contactor coil terminals but it does not energize, the most immediate suspect is the coil itself. Checking the continuity o
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Question: When troubleshooting a contactor that fails to energize, what is the FIRST component to check after ensuring control voltage is present at the coil terminals?
Answer options:
- The resistance of the main power contacts ✅ The continuity of the coil winding
- The mechanical operation of the auxiliary contacts
- The insulation resistance of the coil
Correct answer: The continuity of the coil winding
Explanation: If control voltage is present at the contactor coil terminals but it does not energize, the most immediate suspect is the coil itself. Checking the continuity of the coil winding with an ohmmeter will determine if it's open, which would prevent energization.
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