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I have an (old) Ecotec 415. My observation is that it always starts at 12kw for approx 1 minute, pauses for 5 seconds then starts again at d0 power before modulating down as required. This large power start results in high temperature rise and means that the boiler cannot restart after cycling...

I do this whenever I want to increase the room temperature significantly. For example on return from a holiday. The minimum temperature setting in the VRC430 can be set to a suitable value for the current outdoor temperature and desired heating rate. Also set the heat curve to a very low...

The issues are as I described them. Maintains temperature but not responsive without bodges and manual intervention. Unreasonable amount of tuning and modification required of owner. I have had the problem looked at by Vaillant. They have measured my system and have had the issue...

Ok, then we are getting a clearer idea of what works and what doesn't. Microbore as such isn't an issue. My 10mm drops to the main rad would seem to be fine but a question mark hangs over 8mm. I get approx 4 litres a minute through my main rad, an unknown quantity through the kitchen and...

No, I did have problems in maintaining property temperature but now I have sorted them. I have only become preoccupied with the appliance and controls as that was the only way to get it to work acceptably. I have had to figure out how it should work because I couldn't find out any other way...

I think of myself as being the expert on my system. What I'm hoping will come to light is what exactly it is that no boiler will ever do so that perhaps others will not mistakenly try it and, if anyone else has, to provide some advice as to how to deal with it. If it turns out that there is...

My gas bills are around £200 p.a. and that includes daily use of a gas hob. I wonder how much it says about weather compensation as opposed to "modern condensing boiler" though. From the figures I have seen there is maybe 8% extra from weather compensation used well as you seem to be doing...

The pump wiring is from the boiler at the moment. I'm now using 1.5 heating curve. This maintains my target room temperature well, avoids temperature overshoots and means that I'm often operating with efficient temperatures. I had to use higher numbers before my latest changes and they...

Getting my system to work as well as it now does has had to be a sort of hobby. Certainly no-one else was going to help me. It is my good luck that I'm retired and have the time. On the piping. I'd guess that a lot of people replacing a boiler in an existing microbore installation would...

Crossed in the post there. Good guess. Haven't changed d70 just checked it is 0. I'd be seriously miffed if there was a magic fix. I had hopes for d17 but experiments showed it to be unhelpful. Otherwise I only have d71 and d78 set in the "second diagnostic level".

By which I meant to say VR65.

Hot water cylinder via 3-way valve which is controlled by a VR35 widget. Works acceptably. No issues I want to raise. Closing the bypass does not work. The problem is that the main rad is on 10mm microbore. Only about 4 litres/minute will go through it. The boiler spec says minimum...

I have a Vaillant Ecotec 415 open-vent boiler with VRC430 installed as a roomstat. I have had a lot of difficulties with getting it to work at all and the situation is still not satisfactory. I believe that I have a very good understanding of the problem. I have been contributing to a...

I hope you don't mind that I'm using this to start a new thread "Vaillant VRC430 - what works and what does not?" citing you as an example of a happy customer in contrast with myself. Please see the new thread for a description of my problem. I would like also to reply to you...

My system (small house - low flow) doesn't work very well. Vaillant initially tried to shrug the matter off but later took it more seriously. I did a lot of work to explain the problem to them and made a formal complaint. Eventually they came up with this: "Following an investigation...

The thing of it is though that I got the smallest boiler with the lowest "modulates down to" figure I could get. I got Vaillant for reputation and credibly documented controls. I often need less than 1kw heating in the one room of my well insulated house that I wish to heat. The main rad is...

My house has good insulation and I have radiators sized to work with low temperatures. Even so I have all kinds of difficulties. In my opinion the design of the boiler and controller is the problem. The Vaillant boiler starts up at 12kw and my house can't sink that. The designers have...

If the minimum heat output from the boiler ever exceeds your needs then it will cycle. Many (most?) houses are going to need less than 5kw at some time in the year. Mine often need less than 1kw. So cycling needs to be effective. One of the very silly red herrings thrown up by Vaillant engineers...

In my reply to your previous post, I said that I have d2 set to an unfashionably high value on the basis that the boiler must not try to start until the return water is cool enough so that the temperature rise produced by the 12kw start up rate. Up to this point I had never seen the VRC430...

I have written a couple of times about my problems with an Ecotec 415 and VRC430. I have minimum permitted flow and a high proportion via the bypass. Its a very tricky setup and problems like yours very hard to avoid. Vaillant were no help and I had to work it all out myself. A few...