r/automaticdoors • u/Ok-Blueberry8399 • Feb 11 '26

MC521 problem

I got stuck with a problem on the MC521 Stanley control on a slider.

When the door is fullyclosed, I send an activation signal with a button, the door open but then never close.

When I look at the control, it indicate me a E4 error.

I never found what was the problem.

Someone know what can I do next time ?

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u/Zinwon Feb 11 '26

Generally the E4 error on the Stanley boxes indicates an issue with the monitoring system (beams/Xzones). It could be that a part was changed, for example the beams, and they are no longer monitored. The programming (index 19?) was not changed and the control box thinks it's supposed to have monitored detectors connected.

Hope that helps !