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Interesting .... I will try various modes / setting when the opportunity to log and compare results. This may well not be until around Christmas. Easy to do is dropping the feed temperature to 55C as set now as this will push deeper into condensing mode with a dT of 8 - 10C. I tried once...

With the feed at around 60C the return in the pipes certainly is not around 45C. I've got probes taped on the pipes in the house before they split to different places. I keep meaning to look for some lagging / wadding to put over them but relatively they show dT is under 10C.

I wonder overall how accurate the sensors are. Temperature ought to be within a degree or so but might the others have a wider tolerance? If I remember I can borrow a temperature probe from work one evening and put into the running tap outlet. There ought not to be a big loss at 10l/min after...

The boiler is in the garage attached to the house on the single brick rear wall. The pipes run at roof level on the joists ... see the thread I started.

Back in time I had a higher flow but while no means then to know actual rates it was noticeably reduced when the first water meter was fitted. The boiler DHW demand is set to 50C. A spot check of boiler readings while running a bath showed the maximum DHW flow rate is 10.5 l/min and the target...

With D.170 set to 3 ( which is dT mode) D.171 is hidden. To confirm my other settings D.172 is set to 15 D.173 is set to 100 mbar D.174 is set to 400mbar Heating output temperature is set to 60C A spot check when D.040 output temperature 60C and D.041 return temperature 51C showed D.015 22% and...

This would have add complexity. The combination of 2 channel timer, cylinder thermostat, room thermostat and frost thermostat near boiler simply told the boiler to run if any demand then a separate module set the valve position based on room heating only, hot water cylinder heating only or both...

.... logically it should be but all the Vaillant internal 12C protection thermostat does is circulate water within the boiler. Fine for the heating circuit but even if this ran continuously since no flow in cold water feed or tap hot water outlet pipes these could still be frozen solid. The...

I am only presuming this as unless you can tell me where there is not a readout of the actual dP. As I interpret D.171 is a dP target value setting.

I only found this out after having my basic 12kW boiler, hot water cylinder and Y-plan 3-position valve replaced by a combination boiler. For the old system I set the timer so the cylinder heating and radiator heating did not start at the same time so heating circuit always had the full boiler...

Vaillant could very explicitly state some like ' The integral frost / freezing protection does not protect any external pipes '. If I was designing a boiler controller I would at least include the option to circulate water through the heating circuit if the boiler detected either the feed or...

D.170 is set to 3 D.172 is set to 15 D.173 is set to 100 mbar, lowest as recall if try to set lower it rolls over to 400mbar. I need to check D.174 but 99% not changed so 400mbar ' which presumably will cause the pump to ramp up and down to give the desired dT ( temperature spread) ' .... so...

Taking your second pair of readings with 60C boiler output while a 10C dT gives a greater heat output as I understand with 50C return the boiler will only be just be into the condensing zone while at 20C dT it will be well into the zone so will, or at least should be, more efficient. This does...

The manual for my Vaillant Ecotec Plus 832 states that if the internal temperature drops to 12C frost protection will be activated but, to me anyway, it is not clear exactly what the protection is so I contacted Vaillant. Below is their response for reference:- The frost protection cycle will...

dP or dT mode then the settings are Dxxx codes. The explanation of the modes is in the manual, for mine section 10.3.5 then 10.3.6 - 10.3.8 explain the pressure and the pump. For mine right at the end which I presume is intentional so you access by scrolling back from D000 not going right...

No doubt known / obvious to those familiar with modern boilers but I have just read that modulation is the control of the heat input. Looking at the manual I can not see a Dxxx code for modulation but I thought I had seen it and recall with 60C output temperature achieved it was 18%. If I am...

The systems I have looked at mostly have a nominal 5C thermostat built in, a simple preset bi-metallic switch. In an ideal world this would be in good thermal contact with the ( copper ) pipe but if not it would be inside the grey foam insulation so it ought to be close to the pipe temperature...

I did have a traditional heating and hot water system with a simple gas boiler, loft tanks, a hot water cylinder and Y-plan valve. The boiler is on the rear wall of the garage, presumably from original build. The garage wall is single brick and the roof is flat, wooden planks then rubberbond...

It is a Vaillant Ecotech plus 832, the latest version without the door over the screen. From the manual it should only be run in dP mode with radiators. dT should only be be used for full or partial underfloor heating. I did set dP down to the minimum 100mbar but then slow to heat initially and...

You state the boiler is 1.5 years old. You should have at least a 7 year guarantee, 10 year if installed by a a Vaillant Advance installer. You need to get them to visit, diagnose and rectify the problem. No doubt they will ask about your system. If as suggested by @Johntheo5 your plumber can...