vaillant

Had a short power cut earlier and when the power came back on, it looks like my Vaillant Ecotec 937 plus boiler died. My educated guess is either when the power went out or when the power came back on, the PCB on my boiler died, as now it is completely unresponsive (LCD dead, no heating or hot...

Hello Everyone, Has anyone had any experience with vaillant System boiler in s plan, sensocomfort vrc720f with ambisense TRVs as i was using an old WB combi boiler with Tado at my house but my builder said he wont be able to make tado work with the viesmann 100 in s plan so I am really looking...

Hi I have moved to a different home which has Vaillant Echo tech plus 418 boiler installed with open vented cylinder and a central heating system. The thermostat on the cylinder is set to 60C and the boiler has two radial dials in front to control the flow temperature, both of which are set to...

Hi, I have a Vaillant heating system at home (Ecotec Plus, VRC470f, VR61) and because I've been repletely facing issues with the VR21 wireless outside sensor (dies every 2 - 4 years) I installed a wired VRC DCF (9535) to replace the VR21 sensor. The new sensor is properly installed and detected...

I have a Vaillant Ecotec Plus 837 with normal room stats - i.e. no eBus connected smart controls. I understand, that on it's own accord, the lowest this model will modulate to, is 11Kw - which is too high (I am getting short cycling). Two part question: 1. If I use an eBus connected smart...

Hi all, Preface; checked and can't find this exact issue on here, but similar to this one where someone suggested 'plate heat exchanger needs cleaned /replaced'. Unlike them, however, the boiler was looked at pretty recently. Setup: -Vaillant Ecofit Pure 825 -Radiators all bled and flow...

Vaillant VCW 282 A recent problem with this boiler is the flame not modulating to full both in CH and DHW modes, which is causing the radiators to warm up slowly and the DHW to not get hot enough. The hydraulic control system is seemingly working fine, the Differential Valve opens the Gas Valve...

I have same problem that has been posted on this youtube video: If the boiler has the heating running and you turn on hot water anywhere in the house you can hear this sound. If the heating is off and you turn on hot water, no sound. I also had regular service in November, so 3, 3.5 months...

I have a Vaillant EcoTec 831 (2013 so '2nd generation). I see online that this model has a bad reputation for PCBs, and mine had to be replaced. As it was out of warranty, I found a local plumbing engineering to do this. I don't know where he bought the replacement - and since issues, I've...

Hi all, I have an ecotec plus 832 and less than 2 weeks ago I installed a Vsmart thermostat by myself. The graph under information in the app doesn't look quite right to me and it looks like the boiler turn on/off instead of doing modulation. Am I missing something? Thank you.

Hello, Firstly please excuse my lack of knowledge with heating systems, ill Try and explain what I’m Trying to achieve the best I can. As per the description I have a 428 heat only boiler recently converted from open vent to a sealed system. This is operated by a Yplan and Hive controls. The...

Hi, I would like to upgrade my heating system (ecotec plus VMW 346/5-5 with a VRT370f thermostat) to be able to remotely control it. I was looking at installing a VRC720f thermostat with a VR921 box and several VR50 TRVs to be controlled with the Vaillant app. Before embarking in the full...

I have a Vaillant ecotec plus VMW 346/5-5 with a VRT370f thermostat. I had set the thermostat to a low temperature before going on holiday, when I returned the heating was on, date and time in the thermostat were wrong. There had been an interruption in the mains and the thermostat had...

Hi! I have a VRC700 coupled with VR71 at the moment, but all schemas I can find contain mixing circuits, but all circuits i have are just straight radiators. Is there a way to change them in VRC700 settings, or do I have to use different schema? Do you know where i could get a complete list of...

My Vaillant ecotec (unvented system, not combi) does not show the tap symbol, which normally would mean there is not hot water.. however it does seem to be heating the water. I installed hive 3 today, maybe this is related.. however it may have been doing this before, i never looked. Im not...

We have an EcoFIT pure boiler and have not yet turned on our central heating at the main control but the display on our boiler shows the radiator and tap symbols on permanently. I've never paid much attention to the boiler display before so I'm not sure if it's always been like this, but from...

Hi All, Hope someone out there can help! We have a Vaillant ecotec plus 832 and nest thermostat. Tried putting the heating on this afternoon and isn't working at all, but have still got hot water. There is no fault code showing, and pressure is fine, 1.6. I put it into service mode and...

The story starts from when the energy prices started to rocket. I heard that some big savings could be made by installing Weather Compensation onto compatible boilers to smooth out fluctuations and modulate the boiler. My boiler is an ecoTEC Plus 418 open vented condensing boiler. My original...

Hi, I have a Vaillant Ecotec Exclusive with Green IQ 835, VRC700, weather composition, VR920, Ambisense VR50 and V51. I followed the advice of different posts, especially https://www.diynot.com/diy/threads/vaillant-system-gremlins.541433/ However, I still have several problems...

Hi, I have a Turbomax Pro 28E that is not turning on the heating, I am assuming that this is a wiring is as recently I removed an old thermostat receiver as when we moved into the house there were no controls for it, as such I tried to install a Nest E that I could not get to work. Since then...