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My son has an unvented hot water system installed in his new build house. We know very little about it. We want to fit a water softener immediately after the cold tap in the kitchen, but not sure how to isolate the upstairs cylinder to allow the softener to be plumbed in series with the mains...

Despite careful research I also finished up with no registration. I had a Vaillant 418 open vent boiler fited to my system in 2007. The installing company was CORGI registered and I even checked their registration certificate on line. They also supplied a copy of this document as I wanted to...

I appreciate this is an old topic, but someone may ask the question again. For sterilising and cleaning an ion exchange (resin type) water softener Citric Acid is the best cleaner. This is available from most softener specialist shops at about £5 for 100gm, which is extortion! The same chemical...

Thanks for your reply Tony. Yes I do have an autobypass installed but had not thought of checking it. It is a Honywell DU145 and it had been passing as I found when checking the heat of the by--pass pipe. This is connected correctly immediately after the pump between flow and return and before...

Hi again. Thanks for your replies. Sorry about the reference to 'X plan' Just a typo. Have edited to correct. However, I still don't seem to have an answer to some of my actual questions. (1) Should professional installers set the part load figure (d0) on installation? (2) I have set...

Hi all. I have a Vaillant 418 ECO tech plus boiler with VRT360f and Vr65 running into an open vent system (S Plan) Now that the outside temperature is becoming warmer, I find that boiler is cycling quite often. Have now found that setting 'd0' alows boiler to be set at a lower 'part load'...

Operation of the VRT360 and VRT360f Controllers with ecoTEC plus Boilers. I have realized from correspondence here and elsewhere that operation and limitations of the Vaillant VRT360/360f controllers, when used in conjunction with the VR65 interface, a cylinder thermostat or VR10 Negative...

Hi again Hafussain. Sorry for the slight delay but I have been doing some checks on my system, which is very similar to your own. When the Unistor was fitted, did the installer remove the fitted cylinder thermostat and fit the VR10 NTC which was supplied with the VR65 in its place? Just...

First reply to David - Scampi has hijacked a question but will answer after reply to David. To top up Domestic Hot Water (DHW) outside any set time band, do the following:- Ensure display is normal default. (fig 2,2 of manual on page 7) Press 'F' button four times in succession, to...

Thank you both 'Gas4you' and 'Agile' for your replies. This morning I have disconnected the VR10 thermistor from the NTC position in the VR65 and fitted a cylinder thermostat, connected to its correct location in the VR65. A DHW demand still shuts the boiler down for a short period, if it is...

This question centers around setting 'D70' on this boiler, which should give either DHW priority when set at '0' or allow CH and DHW to operate together when set at '1'. However, it does not seem to have any effect, as DHW has priority at either setting. Copied below is an edited copy of an...

As a long overdue follow up to this topic, I too have a similar occurence (can't call it a problem) but I am using two 2-port zone valves with a VRT360f controller and VR65. With D70 at boiler set to either 1 or 0 (yes I did hold the (i) button for 5 secs until it stoped flashing) the boiler...

Thanks Dave for your reply. I do realise that the full Vaillant system would be slightly more efficient but, due to the cost of a VRT360F controller, it would take some considerable time to offset its cost. Hence the reason for my trying to make the best of what I have got installed. The...

Last year, I had an open vent Vaillant 415 Eco tech plus boiler fitted by a Corgi fitter. I had, prior to fitting, upgraded the system electrics for my old boiler, using a Horstmann 425 mechanical programmer and Drayton Digistat RF1 room thermostat. An existing pair of five wire, 2-port, zone...

Hi Sams66 I am very confudsed by your display readings. Are you sure they are correct? There are two versions of the software for the MC250 Water Softener;- the early version were water is always present in the salt cabinet, allowing the salt to soak' during use, and the later version where the...

I don’t know if there is a limit to posting size, but I have a copy if it fails to post. If there is a limit, can it be posted elsewhere? The MC250 (Electronic) water softener is very easy to check if it is working. (1) Check what is displayed on the electronic module. If the unit shows...