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Hmm, not as good as I expected then! :( The weather around here can (& often does) change on a hourly basis... The marketing blurb suggests they can perform "Checks made every 30 seconds ensure optimum combustion and eliminate the need to check and set CO2 levels Burner is automatically...

I assume you mean VRT392? Let me answer a slightly different question, would I have that combination fitted again? The answer would be Yes & No. :) Yes because I know them well, they work in my property and perform as good as I would expect (They are not perfect but I doubt the...

I expect its been disabled due to this new feature: "Self adjusting range rating function which learns the maximum heating requirement of the system without the need for setting, ensuring the most efficient mode of operation" If it works as described, it should make for a better more...

Erm, yes, I started this thread before I purchased mine in Feb 2011! :) - It seems to have been revived by "croninsfc" posting some info about his... Scooby, I purchased them from supremeplumb.com over a year ago, however, a quick check reveals they (VR65 & VRT392) havn't changed price...

First of all, I have to say I agree with most of what you wrote so I'm playing devil’s advocate here... :) There are companies that have innovated, changed their entire industry and kept propriety standards! Think Apple. :!: This industry is way behind the times from a technology POV...

er, I think you missed some punctuation there! :wink: (wasn't installed by me!) Scooby, several Vaillant (and other) RGI's have provided you with advice, I have provided you with some facts based on the tests you have carried out. So far, the initial diagnosis by everyone has yet to be...

I agree with the meter for a definitive check, however with the figures OP has provided, a flow rate of 17.54 l/m and 30kW means the ΔT = 24.5°C with 28.2kW the ΔT matches OP's figures of 23°C

The 6xx and 8xx range although have same/similar firmware have a different revision of system PCB (there's a number of physical changes). If you take a photo of your's with a clear view of it I can probably tell you! :wink: How old is your boiler btw?

I think it will be as well... as Gaswizzard's quoted above 13 is the CORRECT DSN setting for a ecoTEC plus 428! - Checking d.76 on my system corresponds with the above table i.e. d.76=12 on my ecoTEC plus 418. You earlier tests also mathmatically confirm the boiler was firing at 28.2 kW (as...

If your cylinder was absorbing all 11kW (which should be possible with a 18.7kW coil), it would take approx 40-43 minutes to heat all 145 litres to 60°C (assuming incomming mains water was 15°C). Your earlier tests showed the cyclinder not satisfied after 1hr. If you have a thermometer capable...

Where did 35 seconds come into the equation??? (also re-read my previous posts as d.0 has little influence on the initial burn kW on my system!) Can I ask where that figure has come from as it's vastly different to my calculation above of 7kW. (i'm not 100% confident on my calc but also very...

Was the boiler firing at this point? Do you have the d.0/d.41 figures for the first minute? (did you check d.33?) These figures show you have a flow rate of 17.54 litres per minute. The "Minimum flow rate" as per the ecoTEC 428's instructions is 20 litres per minute. They also show that...

Take a look at the Honeywell evohome which may do what you want!? It's not cheap though! :shock:

The above isn't normal/correct operation so there is an issue somewhere as the cylinder is still calling for heat... All the 4xx series can modulate down to 5-6kW so more info from the OP is needed (delta T figures will confirm if there is adequate circulation). Ich spreche kein Deutsch...

I'm not so sure they do Tony? I don't think the OP has given us enough information (yet).. As I mention a few pages ago, on my own 418 there is no 50 second firing at any kw. It just modulates as needed from startup (my tests were from 'cold' and the boiler was previously off, water temp was...

HEX & Burner: 415/418 use same part, 428/438 use same part Gas valve: 415/418/428 use the same part PCB: 415/418/428/438 use the same part number

Its not and TBH, I wouldn't recommend even attempting to modify the code! I've just looked at my system PCB to identify the revision, on a sticker it says: 0020028402 0494 0340 B Then screen printed onto the PCB is: TM-AC1 V132_C1 0020028453 TL-AC PM-03 However, a quick google...

It will make zero difference even if you can! Without the Vaillant controls, your boiler is just heating water, it has no idea if that water is for CH or DHW so d.77 is meaningless. When using the Vaillant controls, your boiler knows when it's heating DHW (and CH) so can use the d.77 value...

Thanks for the info! :) I'll do some tests tomorrow and also see if I can identify which system board is installed in my boiler (it's circa 2010/11, do you know what was installed in the above?) as this seems to come up often - ISTR from my tests last year it only lasted for 20 seconds (not 50)...

In order to calculate the flow rate, as previously mentioned we need the delta T which is the difference between flow and return temperature (you have only provided return temp). Do you know what d.40 was at any points above? (especially at the beginning and at around 3-4 minutes ) If it...