I currently have a Samsung AE080RXYDGG/EU heat pump that is showing 101 error codes every few weeks or so. I have not been able to connect it to a certain event in my house or in the heat pump itself so far. It did not show these with a Intesis INMBSSAMO4000 modbus interface but it does show them w…

Good point. I was aware of this possibility (I see other people running into that every now and then on projects my company works on). My installation is with a single ground pin connected directly to an earth rail where my 3x25A+N enters the house. And some copper piping for water lines running t…

New error 101 occurrence; now I managed to catch it starting with more parameters logged and a higher log frequency. Interesting detail; After error 101 the MIM-B19N (located in the outdoor unit) still gets updates about the DHW temperature (connected to the control kit). So apparently even with 1…

[image] Martijn_Hinderdael: So apparently even with 101 communication is still active? RS485 is a multidrop bus so it is quite possible for one node to break and communication between other nodes continue unaffected. The 101 error indicates the control kit cannot talk to the outdoor unit, so …

But how do you explain the outdoor unit still getting new values for the DHW temp over the NASA line from the control kit after the 101 error started?

Are you sure the data is coming from the outdoor unit? As far as I remember the DHW sensors are connected to the control unit. The B19 is physically located in the outdoor unit but as long as it is getting power from the outdoor unit it doesn’t need the RS485 (NASA) in the outdoor unit to be functio…

This is the communication scheme…sort of. So you can see what the boiler temperature sensor data had to travel through to be able to end up in my log file. The B19N comes with very short wires with their own special connector to connect to communication print inside the outdoor unit. I could go for…

You could use emonHub to read from the MIM-B19N, this has been proven to reliable and does not cause any errors on heat pump. It sounds like the issue is being caused by the Intesis rather than the wiring. I’ve never seen that error before, modbus is usually incredibly robust [image] …

[image] Martijn_Hinderdael: and different new question marks that I do not have at the moment. Yes, your probably right, best to go down the path you are on rather than open up a new can of worms. [image] glyn.hudson: It sounds like the issue is being caused by the Intesis rather than th…

[image] toadhall: The Intesis works fine, it is the B19 that seems to be causing the problem (the Intesis being galganically isolated, the B19 not). Does the error persisit if you disconnect the TI-M12 and the Intesis? The B19 is an offical Samsung part, thefore I doubt this would causing the…

Troubleshooting Samsung 101 error codes on a AE080RXYDGG/EU ... wiring?

Hardware Heatpump

toadhall (Alun Hawkins) 15 September 2026 14:03 28

Should have thought of this earlier. You could possibly avoid the problem by moving the B19 next to the control unit and make the 20m of Modbus cable redundant. See …