vaillant

My heat and hot water have stopped working at my new apartment. My boiler is showing the F.22 error and I understand that means I need to refill it with water but when I search how to do that I only find results about turning valves, which my boiler doesn't seem to have. Any help would be...

Hello! System as follows: Ecotec 46kw to heat exchanger 4 pumps - 3 heating zones and hw Tank is a Tempest solar 300 (plumbed for heating through boiler only) Controlled by Sensocomfort and 2 slaves Since having the system installed a year ago, I've had a return hot water leg and pump fitted...

Hello all. We have a Vaillant Ecotec plus 615 boiler. Our central heating system has an open tank in the attic and a hot water tank next to the boiler. There is a single three way motorised valve. My main concern is that the boiler regularly fires up even when there is no call for heat. As...

Hi All, Looking for some advice please! Not sure if this could be a DIY Home fix or if I need to call an engineer. I have a Vaillant Ecotec Plus 418, which appears fine on the hot water side and is able to maintain temperature however when I call for heating, initially it seems to go for a...

I have one of these which has worked well for years. Some time ago just about everything except for the pump and heat exchanger was replaced. Today I noticed the boiler needed topping up and I did so to around 1 bar. I then found the automatic air vent was dripping. I took it off and tried...

Hi, Any heating engineers able to help? Apologies if previously covered. I did try and search. Just arrived back from holiday and our boiler won't start up. The screen won't power up and is just continuously flashing 'loading'. It doesn't get as far as showing any error codes. It sounds like...

Hello, Hoping someone can help! Not sure what else to try. We have a Vaillant eco tec boiler and we also have a Vaillant auro stor water heater, but for the last two months all of our hot water is coming out Lukewarm. When we first moved in it worked perfectly and the water was super hot. Our...

Hi, Moved into a flat with a broken knob that controls the radiators. Estate agents were useless so was forced to do a self repair. Ordered new knobs and followed this procedure to the letter - Once I turned the boiler back on, it just says "0c" and no longer have hot water or heating...

Hi DIYnot, Firstly, i will apologize beforehand as my english is not perfect. I am from Denmark, seeking some guidance as i haven't managed to find a plumber or a boiler technician who can help me with my problem. I have had a bigger renovation project where i switched from radiators as a...

Our thermostat has a desired temperature of 20 degrees Celsius but it is turning on the heating, not matter what the temperature is. It is currently reading 26 degrees Celsius. We have tried turning the heating mode off but the thermostat turns back to auto immediately and resets the date as...

I've got one of these boilers - it's about 20 years old. It's got a time switch thingy on the front panel which ticks quite loudly - a bit annoying because it sits in the corner of my lounge (albeit behind a small door). I don't use the time switch - I've got a separate programmable thermostat...

I am hoping someone here can help - have looked through this very helpful forum and couldn't find a similar issue discussed. I have a Vaillant Turbomax plus 828E which works intermittently for both hot water and heating - it comes on sometimes and at other times it doesn't. From what I can tell...

Hi… I have an old Vaillant Ecomax 824/2e that is making some very hot water! The water temp gauge is set to 50 degrees Celsius (on the lcd display on the boiler - the dial is about half way between coldest and hottest). However, when I turn on the top tap fully, the reading on the same gauge...

Hi my boiler lost pressure due to a leaking radiator. Does anyone know how I can repressurise please ? I don't have the manual from when I moved in. I have identified the loop but there is only 1 valve that I can turn. Any guidance would be appreciated it. Complete novice here !

I have a Vaillant ECO Plus, remote hot water cylinder, wired Honeywell S Plan with a Lifestyle LP722. This time of year I have CH set to OFF and HW set to twice per day. For the past day or two, the HW signal calling for heat doesn’t light the boiler. E.g., the boiler water was 19 C this...

Replacement ecoTech boiler & flue Oct 2020. During strong wind, flue terminal admits rain water, which runs into boiler. Rain also seen leaking from flue joints. Have confirmed water ingress is via Air Intake, using garden sprinkler. Accredited, established installer has checked and re-checked...

Hi, We need to presurise our Vaillant Ecotec 24, but for some reason there doesn't seem to be a handle on the valve? Any tips on how we can presurise? I've posted a picture for reference.

Hi. I'm looking for a PCB for my Vaillant Ecotec Plus 424, GC 41 044 74. I don't want to get it wrong! Vaillant Part No: 0020237689 is listed as correct but suppliers are saying, NOW USE 0020273087. But this new one does not seem to list my boiler on supplier websites. Can anyone advise me...

I’ll try to keep this as short as possible! Basically the timer has died on my Ecotec plus 831 combi and rather than just replace it with similar I was thinking now maybe the time to go smart and get something that can help my heating system run more economically as we’re off grid so run off...

My Vaillant ecoTEC plus 618 display is always illuminated - previously it would go dark until I turned one of the temperature setting knobs. Not only that but now the temperature shown is flickering irregularly around the preset temperature (70°) and also flashing back to the outgoing...