Here’s a picture. This is how I remember it. Maybe this is even more clear than my explanation.
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@Elwell I’ve got a Madimack heater and trying to follow your steps. I hate to ask such a dumb question, but do you remember how you got the first lid off your heater? I’ve taken the 5 screws off near the base of the panel with the LCD, but seems like there’s more to it to remove…I’m a little hesitant to apply too much force…
I’m pretty certain I just removed the top plastic cover (3 screws at back, one on each side) by removing the screws and pulling straight up. Once you’ve got that off, double check you’ve isolated the power and then each of the PCBs is in a metal box above the fan. On mine the main controller board (where the modbus connection goes) was in the largest box away from the power / water end, but I think I might have needed to unscrew one of the other lids too to get it off
(as you can see I’ve still not finished the new PCB and am still using the t-can485 board with a not terribly permanent enclosure)
Yup OK cool thanks, I’ll apply a bit more elbow grease then… 
Hello, i am Alexander from Germany.
My English is not so good.
I have reached a Manufactur in China about more Information about the Inverter.
The Inverter on my Machine ist extra. An this Inverter driver are controlled over Modbus from the Main PCB.
My Machine is running and heating my House. I will controll the Inverterdriver directly over an ESP32. But i cant shutdown my Heatpump for Testing this.
Maybe someone else can test it on their heat pump.
I will share the Information for everyone. I load the Pdf up on this Link.
Download - UploadNow.io[PDF Registers Inverter Driver]
Best Regards
Alex
