Code 86 — Low contactor shorted

What does 86 mean?

The low stage contactor is shorted, meaning it is stuck closed and allowing power through when it should be open. This can cause continuous operation or damage.

• Faulty low stage contactor
• Wiring short affecting the contactor
• Control board issue

Click steps to track your progress.

1. 1

   Visually inspect the low stage contactor for signs of failure.

2. 2

   Check wiring associated with the low stage contactor for shorts.

3. 3

   Test the contactor's electrical properties.

4. 4

   Contact an HVAC technician for repair or replacement.