Using OTGW for monitoring data between boiler and heatpump

[budweiser29]

Good afternoon , I'm new on the forum. I do not have all the knowledge about the opentherm gateway, hence my question
I was looking for a way to monitor the signals coming from my ATAG boiler I36ECZ towards the management system of heatpump Weheat Flint
Both devices are at this moment connected with open therm ( wired) but I have limited access to the parameters coming and going between these two devices.
Sometimes there is an fault and the heatpump stops voor a certain time, but I get no message from the error.
Weheat supplier has blocked these messages only to use for them and the intaller of the heat-pump.
So as a consumer I'm sometimes blind to find out what actually is happening.

Would the opentherm gateway be the solution for this, and will it work in my case.?

So the boiler is connected via open therm to the management system of the Weheat pump and from this management systems 2 wires are going into the house to the honnywell T6 thermostat.
I was thinking to connect the OTGW between the boiler and management system.
I was thinking of placing one working on WIFI to connect to my windows laptop wireless

Thank you in advance

[hvxl]

Most likely the Weheat works like an opentherm gateway itself. So it should be possible to connect the OTGW either between the boiler and the heatpump or between the thermostat and the heatpump.

I don't expect there will be much difference in the messages on the two interfaces during normal operation. The heatpump will probably only manipulate a few bits in the status message: CH enable (ID0:HB0) off, DHW enable (ID0:HB1) off, and DHW blocking (ID0:HB6) on. This will prevent the boiler from providing any heat for central heating or hot water as long as the heatpump is able to take care of this.

If the heatpump does report any problems via opentherm, I would expect that to only happen on the connection between the thermostat and the heatpump. On that connection the heatpump acts as the slave. There are opentherm messages defined for the slave to report errors to the master, but not the other way around. Unfortunately, those messages are mostly OEM-specific fault codes. Without a table explaining their meaning, they are not all that informative. There are only a few bits defined in ID5 that have a fixed meaning.

Long story short: Will the OTGW work in your case? Probably. Will it be the solution for this? I'm not optimistic.

Note: This is all just my expectation of how a setup like this works. I have no actual hands-on experience with heatpumps and I have found that manufacturers can come up with the strangest ways of doing things. So I may be completely wrong.

[budweiser29]

Thank you for replying Schelte.
Your comments make sense, it's probably not always clear what suppliers create in the hardware/software of their devices.
For me it's also not very clear how my system is working together at this moment. I have the impression that the heating pump and the boiler are working quite good together but I'm not very sure . Monitoring the parameters I get from the weheat management system makes sense for most of the time but sometimes I cannot explain some strange behaviour.
On the ATAG boiler there is a parameter which is telling me if I want to use the boiler in a hybride configuration. This value is now 0 , if I put it on 1 and got a communication error on the OT bus. ( the question here , does it only work with ATAG heatpump......).
So I'm not sure if my system is working master-slave between the thermostat-heatpump and boiler. or if it's only master slave between the thermostat and the heat pump.

Anyhow thanks for your reply, I will pruchase a OTGW from NODO shop and see which signals I will get and maybe get some more answers.

Regards
Theo