Refrigeration & Air Conditioning Mechanic Red Seal · Question
A temperature sensor displays 'OL' (overload/open loop) on a digital multimeter when checked for resistance. What does this reading indicate?
An 'OL' or 'open loop' reading on an ohmmeter indicates infinite resistance, meaning there is an open circuit. This suggests a broken wire within the sensor, a
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Question: A temperature sensor displays 'OL' (overload/open loop) on a digital multimeter when checked for resistance. What does this reading indicate?
Answer options:
- The sensor is reading its maximum temperature.
- The sensor has an internal short circuit. ✅ The sensor circuit is open, or the sensor itself is open.
- The sensor is operating normally at ambient temperature.
Correct answer: The sensor circuit is open, or the sensor itself is open.
Explanation: An 'OL' or 'open loop' reading on an ohmmeter indicates infinite resistance, meaning there is an open circuit. This suggests a broken wire within the sensor, a disconnected lead, or a faulty sensor element that has failed open.
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