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I thought that the weather sensor tweaked the power (how quickly the water heated) and the inside actual to required temperature tweaked the water temperature set point (how hot the water could get).

My D.00 can be set from 5 kW to 18 kW. If I set it to 5, it still runs at around 60 % of its max (around 11 kW) for around the first 1 minute after ignition. That is the annoying part. Mine (being 230 V control) doesn't know if it is running CH or DHW, as it only has a 'demand' input. I like the...

Thanks. My D.00 is set to 9 kW. I manually change it according to the weather (I call it manual weather comp!) It doesn't seem to matter what I set D.00 to, the boiler always starts up at the same output power rating, maybe 60% of its maximim. After 1 minute, it then runs at D.00 value, so I...

I have a Vaillant ecotec plus open vent boiler, and I wonder if that would be able to run at a low output temperatures under ebus control? I ask this, as in 230 v operation, each time it recieves a call for heat, it runs at around 60% power for approx 1 minute, before it modulates, and often...

We have an Opty Mist, the Albany, since 2013. In December 2020, I searched for help with it, and found this site and thread. Wow! Having had the (what now seems like typical) problems, I thought I'd say what I have found: The heater always works fine (although not often used), so no issues. The...