How can I change my TPDIN-Monitor-WEB2 relays to Normally Closed (NC)

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Unofficial hack.

Note: This is an unofficial hack. Do this at your own risk.

You can change the CH3 and CH4 relays to Normally Closed by changing the position of a soldered jumper wire inside the unit.

Open the unit by removing all screws. Unsolder and move jumper from NO to NC. Make sure soldering is good. Be sure not to damage any surrounding components.

If you need to return the product for warranty, you must put the unit back to original configuration or the warranty request may be rejected and/or you may be charged a restocking fee.