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Thanks again for your detailed information. The boiler is a combi boiler so whilst it does not have a hot water tank - it has a hot water thermal store which is heated to about 75degC - this water is then dumped into a plate heat exchanger to rapidly and instantly heat water on demand as soon as flo...

an update as to where i am on this... Tado eventually caved in and sent me a replacement opentherm controller... I connected it up (along with the gateway so i could see what was going on) I turned the gateway into Monitor mode and whoo hoo it was still working - I thought I must have had a faulty u...

Hi, Im currently in the midst of support tickets to both Tado (My opentherm controller manufacturer) and Navien (My boiler manufacturer) regarding very disappointing communication and compatibility between these 2 units. unfortunately convincing Tado to escalate my issue to their Dev team is taking ...

Thankyou again for your informative response... Piecing together everything I've observed using the OTGW and the oscilloscope and the boiler behaviour with everything thats been discussed here. I'm pretty sure the issue with my setup is (as per one of your suggestions) the Tado bitrate being too fas...

At least you have a solution: Use the OTGW in gateway mode to clean up the signals. I've been considering this. (i may even add a wifi module to so i can connect it to home assistant and log some of that data). My only reservation is that if anything happens to the OTGW wont it revert to monitor mo...

Ive done a set of tests however i am not sure i understand some of the results or the implications of them. results are in text files in the google drive share https://drive.google.com/drive/folders/1XMY-hBc3siO5h_1mkzAeJ_W-D-ITOHsA?usp=sharing Test2: thermostat timings: provided a ton of almost ide...

Thankyou hvxl for that detailed and informative response. Id not considered the timings but I can see on my scope screenshot it is a fair bit shorter than the 1ms it should be on that tado - not sure if its outside of spec but its not bang on. (Ill measure it over the weekend) Id not considered the ...

Just done some more testing with the scope connected at the boiler side and switching between OTGW "gateway" mode and OTGW "monitor" mode There's zero difference in the high/low voltages seen at the boiler so I'm moving towards ruling out the slight voltage variances between Tado...

Sorry this is a long post, but its a complex issue / question so need to get all the info I have so far out there. Hi, I'm new here, I understand this is the place to find opentherm gateway experts... I recently fitted a Navien LCB700 Oil Combi boiler. and originally had it hooked up to my Google Ne...