vaillant

Vaillant thermocompact 142Eh (I know it is old) during this cold weather cannot heat my house enough. Any ideas as to why. The boiler was checked a while ago... cleaned/gas pressure tested/flame checked for low startup then full flame etc. Temp gauge says 70 c during this cold weather but it...

Hi, I find myself asking for help again with pressure issues on my Vaillant ecoTEC plus 637 system boiler. This seems to be an annual problem! A few weeks ago, my boiler was serviced and last week I awoke to a cold house and a F.75 error. I let more water in and the boiler, CH and hot water...

Hi all, I am in absolutely no way handy around the house, but hoping this is something I can sort myself... I have a Vaillant EcoTec 615 system boiler, under 2 years old, pressure is within safe range and no warning symbols displayed. However, heating was stuck on as of last night and won't go...

Hi i have a very old Vaillant and its done me very good service but now go a problem When DHW is demanded the boiler does not fire up at first I thought it was the differential valve not sensing the water pressure but the pin was moving and the micro switches were going over the CH is fine but...

Hi there, Hoping someone out there can help me. I have a vaillant ecotec plus boiler No hot water No central heating Loud clicking noise coming from boiler Display is flashing between 0degrees & 0.0 bar When I hold down the minus key to check actual pressure it says 2.5bar Pressure gauge is in...

Hi all, Hopefully, you may be able to help. We've got the above-named boiler (it's an 800 series, 824 iirc) and it's behaving a little strangely. The central heating system works well (considering the radiators/pipework have been installed poorly (this is slowly being corrected as and when...

Hi, First post so please forgive me where I go wrong. Wondering if anybody has some detailed knowledge about a suspected bypass valve that is not working as I expect it to. To elaborate: I have a Vaillant Ecotec 637 boiler, with an S-plan layout. Large 5 bed, 3 bath detached, decent...

Hi all.... I think it's possible to fit a Nest to my Vaillant 828 Turbomax boiler but I'm pretty confused about the whole thing really and there are so many different threads about doing it, I'm even more confused. I must say THIS thread is useful as it discusses fitting to a 824 boiler. Part...

Hi all, I have a Vaillant thermocompact 628E, the pressure was around 0.6 bar (It should be around 1.0) so I filled it from the filling loop to around the number 1. Afterwards, I've noticed when the rads come on, the pressure on the boiler goes over the red line after the number 3, causing the...

Hi, I am hoping someone here can help me, as this issue is driving me and my family mad,below are the facts. We live in a 5 bed detached house C. 2500sqft, we have 16 radiators in the house: 3 Towel rails, 7 down stairs, and 6 upstairs. The downstairs and upstairs radiators are all double...

Hello. I have a Turbomax Plus 824e boiler which has been limping along for some time. I am NOT GS registered but when it comes to things like replacing a screw in thermistor or topping up water pressure I am just about functional. I have no understanding or inclination to go inside the...

Hi, 1st post and I'm a bit of an amatuer (can do basic wiring) so be gentle... Basically I need to wire a 3rd generation Nest Heatlink to a Vaillant EcoTEC 937. Could someone please relate the Nest instructions to the boiler wiring diagram for me? I'm not sure which Nest instructions I should...

hello Looking for some advice; I have a vaillant eco tec plus 824 combi boiler. Last year the hot water started running cold after a few minutes. Heaton engineer cleaned the whole system, replaced the heat exchange and the pump. The pump seemed to do the trick. It's coming up to a year since it...

Hi all, newbie here. Less than a year ago I had a new Vaillant Ecotec boiler installed with a VFT350F controller. It connects via a VR65 control box to my existing honeywell gravity fed cylinder. It works well when programmed to come on, but I have never been able to get the 'cylinder boost'...

I have a Vaillant ecoTEC plus 630 system boiler supplying 4 central heating zones (3 radiator and one wet underfloor) and one unvented hot water cylinder. The system is controlled by a Heatmiser wiring centre linked wirelessly to 4 room thermostats/timers. When the heating is on and the hot...

I have a Vaillant 831 boiler which is not heating water. It is 4 years old and has had a diverter valve changed 2 years ago. It was working last night but this morning it has stopped heating the water. The central heating is working as it should. When a hot water tap is opened the flame symbol...

Hi there, Our boiler packed in a while back, and after 2 weeks of cold water, our landlord had a new boiler installed today. I was delighted to have the heating back, but I think there's something wrong with the boiler (likely how it was installed, I'm guessing). When I first looked at it...

Got a small problem with my Vaillant VRC 470f wireless weather compensating heating controller that is used with my Eco Tec Plus 937 boiler. Every now and then (a few to several times a week), the clock on the controller randomly resets its self as if new batteries were put in. This has lead to...

Hi Folks, Moved into a new house 3 weeks ago (not a new build). Previous owners had a Oil to Gas conversion done 2 years ago this week. Copper cylinder has been removed and a Vaillant ecoTEC plus gas combi boiler fitted. When we moved in 3 weeks ago the previous owners left a note saying "Water...

Hey all. I've been researching "smart" room stats and TRVs for my new Vaillant ecotec plus 835 boiler. The boiler is a brand new ERP compliant boiler. I've come across two products that appeal to me. Tado & Evohome. Both (Tado coming soon) offer "Smart" zoning using replacement TRVs without...