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Happy New Year everyone and good luck with all your plumbing adventures. Regular visitors to this forum will know that I have an unhealthy obsession with monitoring my boiler's ebus. I noticed recently that the modulation during the CH on periods has a weird instability that has been getting...

Vaillant ecoTEC Plus 418 with VRT392f controller. Why does the return temp exceed the flow temp when the pump switches off? Does it matter? Mike

What is a typical figure for the rate of increase in room temperature when a heating system starts up? A friend of mine said it should be 4degC per hour but mine only manages about 1degC per hour between 6am and 9am. Mike

I have the aforesaid boiler with a VR65 control centre and VRT 392f wireless thermostat which is set to two-point control. The boiler's fault memory is full of F.72 (NTC fault) although the boiler appears to be working normally. I asked my heating engineer to change both NTC sensors as a fairly...

I have a Vaillant ecoTEC plus 418 on a vented system with twin 2-port valves, ABV, VRC 470f, VR65 and outdoor temperature sensor. The CH Part Load is set to 5kW. HW is timed to come on at 5am and CH at 6am. HW is working as I expected but CH cuts off when the flow temp reaches 50C, well below...

My Vaillant ecoTEC plus 418 was installed in 2009 on a vented system with twin 2-port valves and conventional Danfoss controls. It has been very reliable but in an effort to reduce the running costs I have replaced the Danfoss controls with a VRC 470f, VR65 and outdoor temperature sensor. It's...

Can anyone tell me what each of the values in these ebus status messages from my ecoTec 418 boiler mean please? I can guess some of them but I'd like to hear from someone who actually knows! pi@vaillant:~ $ ebusctl read -f -c bai Status01 38.0;39.0;-;-;-;off pi@vaillant:~ $ ebusctl read -f -c...

I have an ecoTec 418 boiler with VR65 controller, VRT392f thermostat and a conventional 42x18 HW cylinder. I have set the CH part load to 12kW and it keeps the house nice and warm. The HW part load is at the default value of 18kW. Is there any advantage to reducing this, i.e will it save money...