vaillant

Hi. I have a Vaillant aroTHERM plus heat pump with VRC700 controller and VR921 sensoNET internet gateway. I'm currently using Tado to turn the heating on and off. I'm looking to have the Vaillant system control the heating on/off instead. The heat pump has the VRC700 controller and VR921...

Hi all, I appreciate you help in advance, and hope this post also helps someone else in the future! I need to make a decision on what heating and hot water system to get installed. All new pipes are being laid, and I will have radiators everywhere (no UFH). My options after quite a bit of...

Quick question, out of the two boilers below, what would you say is the better and more reliable one? 1) Vaillant ecoTEC plus 940 Boiler 2) Viessman Vitodens 111-W Boiler 3) Or how about the Vaillant EcoTEC Pro 24 which is not a storage combi, but has the "aquaCOMFORT System" which is...

Hi all, I am wanting to install a Hive Heating System to my Vaillant Ecotec Pro 28 Combi Boiler, which currently has 2 zones set up - one for upstairs, and the other for downstairs. We have 2 thermostats to control these zones, but are wanting to replace these with Hive thermostats if possible...

Hi guys, So yesterday morning I woke up to a f75 error code on my 2006 vaillant boiler ecotec pro 28. After some research I decided to replace the water pressure sensor as the cheapest place to start. So in doing so, I isolated and drained the boiler, fitting new sensors, repressurised the...

Hi, some desperate assistance required please. So, recently come to address an issue where the Vaillant Boiler 837 has had isolating valves fitted, since then, when DHW is used, the boiler pressure drops, as if the water that holds the pressure is released in hot water. also, when I turn the...

Hi, I recently had an engineer fit a Hive smart thermostat to my Vaillant boiler. Previously the boiler was working with the standard Vaillant thermostat, and the radiators were providing the desired levels of heat. Since the Hive has been installed, the boiler does not reach the target...

Hello, I have a Vaillant TurboMax Plus 828E which I’m experiencing an issue with persistent cycling using the central heating. For years I’ve thought this was normal and that’s just how it operates, but maybe we’re just feeling the cold more because it’s becoming uncomfortable. I’ve got the...

My current set up is Vaillant ecoTEC plus 832 combi boiler, with a Vaillant Sensohome Vrt380F to control the heating. Ideally I would like to get this updated to allow me to manage the heating away from my home through an App. I've been looking at the Vaillant Internet Gateway as a means for...

Hello, I've bought the thermostat in the picture and have connected the 3 wires from my old thermostat. The thermostat turned on but it won't turn on the boiler. I have boiler board photo attached. Please help.

My hot water stopped working and I noticed the pressure on my VAILLANT TURBOMAX boiler had dropped to zero. I increased the pressure to 1.5 by opening the Filling Loop valve, but after I closed the valve, the pressure kept on rising getting very close to the red area. I bled a radiator and it...

Hi everyone, We’re new tenants in an apartment that has a Vaillant ecoTEC plus VUW 25/26CS/1-5 boiler responsible for water heating and the central heating system. We’ve noticed that every time the boiler starts heating, there is a loud banging or rattling noise. When this happens, the cover of...

TLDR OK, this is not so dozy a question - and the background is below for people who want to know why I am asking this, but bottom line: What is the technical reason for anti-cycling lockouts? Does constant firing use too much gas, wear something out - what? Put it another way: If there was...

Hi All, I am curious to know if anyone can protect with some information related to the Vaillant AroTherm plus VWZ AI controller? Does anyone have any suggestions to improve performance here??? EG: I noticed that the DHW pump speed is set to 100% by default. Is this necessary??? Has anyone...

How do I offset room temperature to a vcr720 that's reading high when compared to a calibrated temp sensor

Hi All, I was wondering if someone can explain to me how you wire up a Vaillant AroTherm Plus with a SensoNET 921 and sensoComfort 720F/2. I just purchased an accessory for the SensoNET 921 that is used instead of a mains plug adapter. (See image below) As referred to in the SensoNet manual...

Hi My TurboMax 828 is 23 yrs old and the diverter valve has been replaced three times in the last three years. So now thinking of replacing the boiler with another Vaillant. Would prefer to keep existing flue, if it is still in good condition. Would anyone know if the ecoTEC plus or ecoFIT...

I'd like some advice on what I should connect to my new boiler please I'm getting a Vaillant EcoTec Plus 940 installed and I don't think my plumber would mind me saying that he's a great plumber and corgi engineer but he hates all that smart boll-ox. I currently have a Nest connected to the...

Hi Everyone, I was wondering if anyone knows of a way to shorten a flexible stainless steel flex hose for a Vaillant ASHP? I have previously purchased flex connection hoses from Vaillant that could be shortened using a circlip, but it would appear that they have changed their manufacturing...

I have the 2023 release Vaillant Ecotec Plus 832 installed (touch screen display at front). It was installed with a Wolseley Centre wireless controller however the radiators were taking 50 minutes to 1 hour to come up to the target flow rate of 60 degrees and after much misdirection by Vaillant...