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I have created the trouble shooting instructions for precisely this kind of situation.

Too bad you are giving up on the Celcia 20. I don't like unresolved mysteries. I would have liked to figure out why it's not working for you. Although I can also understand that you prefer a reliable heating system at this time of the year.

The problem was on the server side. Somehow the web page got corrupted. I don't know how.

I have regenerated it. Thanks for reporting.

Zie de discussie hier.

May I assume the measurements you reported were done with the boiler and thermostat disconnected? In that case the voltages you found are normal. The OTGW consists of 2 electrically isolated parts: The main part with the processor and thermostat interface, and the boiler interface. The boiler interf...

You asked the same question here. It would be best to keep the discussion in one place.

Domoticz should not be doing anything that could cause the Celcia to crash. My current best guess is that perhaps communication between the OTGW and Celcia stops working and that causes the Celcia to throw a tantrum. Logs would show if that is the case (but not the kind of logs where Domoticz has sw...

You can use the interface firmware to simulate a boiler with the OTGW. No special power supply is needed. With the normal power supply, the OTGW can supply all of the power levels defined by the Opentherm specs. In addition to the interface firmware, you'll need some software. I don't know of any th...

The OTGW crashes you saw in the past were due to a stack overflow. In that case the PIC would be reset by the watch dog timer. That problem was fixed in firmware 5.3. What you are seeing now looks like something very different. You have a v2.3 board. It says so, right on the board. That is one of th...

The opentherm specification defines a few messages as mandatory. This includes 14 and 17. The OTGW will always continue sending these IDs.

The purpose of adding a temperature sensor to the OTGW is so it can return the outside- or return water temperature to the thermostat. If the thermostat doesn't request this information, there is not much use in adding such a sensor. With nothing asking about the measured temperature, it will not ap...

The UI command tells the OTGW never to send the specified message to the boiler. That's the opposite of what you want, and possibly detrimental to the temperature control algorithm of your thermostat. The error is really in the thermostat that sends an invalid message. Since it is probably not feasi...

Switching between gateway- and monitor mode is a feature only the gateway firmware provides. The diagnostic firmware always just passes on messages between the thermostat and boiler (like monitor mode), when a thermostat is connected. Unless we have a different idea about switching the OTGW into gat...

I see no reason for the Celcia crashes in the data you provided. ("Low power" is not an error indication. It just reports the Smart Power state, which can be low, medium, or high. Low power is the normal state.)

The OTGW doesn't require much power at all. A 1A power supply should suffice.

An issue that develops or deteriorates over time without any deliberate changes being made to a system usually indicates a hardware issue. Your log shows nothing special is going on before logging stops. My first suspicion would be that the power supply or USB cable is going bad. Which hardware vers...