Q : How to solve the problem that the GD20U's terminals invlaid?
A: Possible causes of failure:
1. The short-circuit connection jumper between terminal 24 V and PW is lost;
2. The voltage of terminal 24 V is abnormal;
3. The terminal is damaged;
4. The terminal polarity is set incorrectly;
5. Some parameter setting is improper, please reset to factory parameters, then test.
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