vaillant

Hi When I run the cold tap or flush the toilet, the hot water symbol momentarily flashes on the combi display for about half a second and the boiler makes a few whirring noises, going quiet again after about 20 seconds. The flame symbol does not come on. If the CH is running, then it appears...

Not sure this is the right place, but here goes... Recently moved in as 2nd tenants to a new build, it has a Vaillant combi boiler, and dual zone thermostats - never had 2 thermostats before. Whilst the boiler is in the kitchen there seems to be thermostat labeled pipes and control in the...

I have a vaillant boiler which is giving hot water but not heating. None of my radiators are heating up, can anyone help?

My vaillant ecoFIT pure always shows a radiator icon, even when I believe there should be no demand. Is this normal? Also, the pipe leading into the motorised valve for the radiators is hot, and it's slightly warm leading out of it too, which also makes me think the boiler's heating the water...

We had to replace our boiler last year, been less than one year. All has been fine, except I noticed some drops of water from under side of the boiler a few days ago. The water came from the small plastic outlet. I've looked at the install manual and it wasn't clear, thought it was the...

Hi all, New build, new boiler September 22. Developer delays mean I missed the opportunity to get an extended warranty so no help from Vaillant. The batteries ran out on my thermostat so connection to the Heating Gateway lost. I changed the batteries but still no connection. Phoned Vaillant...

Hi, I have a Vaillant system boiler setup with the new (July 2023) ecoTec 630 and a VR71 wiring centre. I asked Vaillant before purchasing this whether there was any benefit of using a Vaillant cylinder over a third party and was told no, they all do the same thing. So I chose a Gledhill hot...

Hi, I have a Vaillant IQ Combi boiler that is displaying F.55 which indicates a bad co sensor. What kind of problems will this cause running the boiler while I wait for the warranty tech to come out. Thanks

Dear All, Please kindly advise, i don't know what else to do! Had new boiler Vaillant 424 heat only open vent boiler installed with new flue and filter, new pump, plus new Hive. Did full power flush of all 5 radiators before the installation. It has been 10days and boiler stil not working...

I have a heating system configured with s plan wiring. There are two zones and one pressurised hot water cylinder. The are three 2 port motorised valves. 2 for the tow heating zones and one for the hot water cylinder. When the programmer calls for heat and the respective cylinder or room...

Hello, I’m hoping someone can help as I’m getting differing advice every time I speak to Vaillant; We are refurbishing a property and installing a Vaillant Ecotec Plus 630 system boiler with a Megaflo cylinder. We are creating 4-zones: Downstairs rads Upstairs rads Bathroom underfloor...

Hi all, I’ve removed a couple of rads but i’m now looking to install new rads and TRV’s which would mean isolating/draining the system. Even though I had removed the rads, when i open the valve upstairs water still gushes out (i expected it not too given i’d removed a couple but obviously...

Hi, I've got a Vaillant Turbomax boiler, there is hot water for a couple of minutes then goes cold. The pressure is at 1 when the boiler is not in use. I've tried to pressurise by opening both valves (as shown in the below link) but water doesn't come in. Any advice would be brilliant Thanks...

Hi, i have a Vaillant boiler which had heating but no hot water, I assumed it was the diverter valve cartridge getting stuck so I replaced it, and now the hot water works but I have no heating. The boiler icon on the display appears and boiler fires up like normal, and after a few seconds the...

Morning all. I'm struggling to get to the bottom of this one so would appreciate some advice please... The equipment: 15y old Vaillant ecotech plus gas combi boiler. Regularly serviced. New diverter valve. Recent chemical flush of CH. Recent acid flush of heat exchanger. The situation...

Hi all, this is my first thread here. Sorry in advance, if I break the rules. I've recently moved to a flat in Germany and it has a boiler in bathroom. First thing I noticed was the pressure/bar was below 0.5. I immediately called the landlord and he called service for maintenance. They cleaned...

Hi We are getting the message 'Heat Generator Fault' on our Vaillant ecoTEC Sustain 34 boiler thermostat. we do not get any error code on the boiler itself, the display on the boiler just flashes 0.0. To fix we press 'back' on the thermostat and set to around 19 degrees, hold the power...

Once before have you come to the rescue, ScrewFix hive mind, so here’s hoping you can help me with my conundrum: My boiler is making a buzzing noise until I turn the hot water tap on. Is this: a) something easily fixed (something I can fix) b) something that needs a pro but that will then be...

Hi Guys, My 2yo "Vaillant Ecotec Pro" Combi boiler works great, however when i use 1 particular hot tap out of 4 which are all on the same pipe, the pressure drops and the unit pressure drops and cuts out the system. How can that happen with only 1 of the 4 taps ? as all the others...

I have a small question, my vaillant boiler is losing pressure every night when the heating is off. So when I wake up, the boiler shows the errors f72 or f75. So I add water to about 1.3 bar and when I turn on heating it works like normal. When it's night time I turn off the heating and the next...