vaillant

Let me first list the set-up we have: Vaillant ecoTec Plus 637 system boiler Zilmet unvented hot water cylinder with external expansion vessel 1 zone valve for Central Heating 1 zone valve for hot water cylinder 1 Grundfos 15-50/60 circulation pump (on flow pipe from boiler) 16 radiators...

Dear whoever can help.... I installed a full (18 feed, 4 story) radiator system into my own house 14 years ago. It’s a 1860 building ... I used the Vaillant turbomax 828e...Over the years I have replaced the pressure switch once, the fan assembly once and the PCB once due to a intruding slug...

In June, the boiler showed an F20 safety switch off temperature limiter, sign. We had the Vaillant engineer come out, who told us that the water pressure was the problem.We were also told the TRV4 on our radiators are not suitable for our boiler. Something about a bypass. The heat needs to go...

Hi, Have bought a house and inherited a Vaillant EcoMax 835/2 boiler, about 10 years old. Seemed to be working at first. However it started to give f25 faults and now alternates between f25 and f32. You can clear the fault and then it might work, but sometimes it takes 3/4 attempts. When set...

I have had a Vaillant ecoTEC boiler with the VRC430f Weather Compensating Controller for several years without any serious problems. Recently, the external temperature sensor has been showing 18 or 19C, so the heating is not doing a lot. The Signal Strength screen in the VRC's Installation...

Fairly complicated one this, but would appreciate any input if anyone has any thoughts. Currently, have a old, Baxi Boston boiler, with pumped CH, gravity Hot Water in our house. Works great, added a NEST to it that made it pretty easy to control and make the house warm when we want it. Like...

I've got a Vaillant Turbomax Plus 837e. Lately it's had a few instances where it just doesn't deliver hot water. Possibly happens once a week, I press the 'reset' button, the boiler restarts and all is well. However, this morning it's worse. A reset doesn't help. If I turn the mains power off...

Hello, Can anyone help identify the manufacturer date of a Vaillant GA92-180SP boiler with serial number 319-1098? Thanks.

I recently moved into a house and the boiler installed is a Vaillant EcoTEC plus 618. There is hot water tank for the shower downstairs and that has a water thermostat on it too. Boiler: Vaillant EcoTEC plus 618 Hive Dual Channel I have attached the current wiring of the Hive, which does not...

Can anyone please help. I'm brand new to this forum so please bear with me. I have moved house and there's a vaillant ecotech pro 28 boiler with the old style (hands and pins) clock dial. It seems the clock is running slow and losing around 30 mins per day. What can I do please?

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...