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Having said that, you may actually have a better shot than most to measure it. When you activate the backlight of the iSense, it switches to medium power, meaning a high logical level for the current. So, when you connect the iSense directly to the boiler and measure the current, you should see aro...

So far it seems that I do not have any issues. If I have some, I'll report them here. Thank you for your help in diagnosing my issue.

Since two others have also reported something similar with (recent?) Remeha boilers, could it be that the issue is with the boilers and not the OTGW?

How good are your eyes? Can you check what is written on R4? That's the SMD resistor circled in the image below. I don't know about my eyes, but my smartphone camera works surprisingly decent in subpar light conditions. Resistor R4.png The two most likely numbers on there are 271 and 331. Yours sho...

You are the third person reporting this type of problem with a Remeha boiler recently. That's starting to become suspicious. OK. I might need to take back my previous suspicions concerning that my OTGW might be broken, if the same situation was recently reported by others. I'll try to keep an open ...

I'm trying to connect an OTGW (V2.7, Nodo-Shop, P16F1847, firmware version 6.1) between a Remeha Avanta Ace 35c boiler and a wired Remeha iSense V30 thermostat. Messages from the thermostat are received by the OTGW, but messages from the boiler are never received (by the OTGW or by the thermostat). ...