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thanks @Johntheo5. Stupid question but what does TMV mean? Do I need to do anything to the manifold pump setting?

thanks @Johntheo5. While I try to sort out the rad issue first, one thing I also want to do is to test the UFH system but running this on its own. If this also causes an s.53 on the boiler, then I am thinking this would rule out the theory of their being a blockage in the rad system which is...

thanks @Johntheo5. I am back home tomorrow and so will adjust the pump setting to I. When I am testing the behaviour of the boiler, I fire up just the rads. I have not tried the UFH for quite some time now mainly because the weather has been mild and with the sun coming through into the...

@Johntheo5 - d.05 is 65

thanks @Johntheo5. Things have been pretty hectic lately. I will look to find out the setting of d.05. What I have done since last posting is getting back the CORGI engineer who replaced 90% of my radiators in the house back in April this year together with replacing the old Grundfos pump with a...

thanks @Johntheo5. I think the situation has got worse :(. I managed to find out how to display the d.40 & d.41 temps. I turned down d.00 to 10. After starting the CH, the boiler fired for about 20 seconds and then immediately went into a S.53 After 2 minutes, I took readings, i.e. d40 = 35...

many thanks @Johntheo5. By the time I got to the boiler, it was already in a S.53 state :(. I did try to look up on the internet on how to display the d.40 and d.41 values but unfortunately I could not come across any instructions. I did watch this video but the control panel is slightly...

Thanks @Johntheo5. I will do this tomorrow. Isn’t setting d.00 to 10kW too low? I believe the maximum for this boiler is 38kW. How often should I monitor the d,40 & d.41 readings? What is the overall intention of this? I was recently closing slightly some of the lockshields on radiators...

Thanks @Johntheo5. How can I find out what the boiler flow temperature SP is? It is happening with central heating only, with UFH only, and when both heating types are requested

thanks @SpecialK , @Madrab and @Lower for your help so far. I have lowered the flow metres so that they are now at around 2.5/3 L/Min. I have also reduced the temperature on the Blending valve to 45C. Attached are photos showing reading on the various dials. The problem I have now (which has...

Thanks @SpecialK. I have a Vailant ecoTEC Plus 637 boiler. Not sure what you mean by “the input flow temp stay constant (ish) or does it cycle hot and cold fairly quickly?” - is this the input pipe into the blending valve? How can I check for this? What do you mean by “internally bypassed”...

@Madrab - I will check with the installer but from what I recall, each of the 2 pipe runs around 60-70m in length

Thanks. @Madrab - you say "the blending valve certainly should be up at max". Just to be certain, do you actually mean "be up at max" or did you mean to say "not be up at max"? If it should not be up at max, what setting should it be at? I think I will discuss with the installer about setting...

thanks @Lower. Assuming I am looking at the correct flow meters, I cannot see where the right-hand meter is showing more than 5. I have attached a close up photo of the flow meters. My internal orangery size where the UFH is installed is 5.4m x 3.7m and I have a fair amount of glass within the...

thanks @Madrab and @Lower. Let me try and answer what I can. I have attached some more photos after running the UFH system for one hour. The flow rate appears to be at 3-3.5 The pipe coming from the 2 port valve (which is in a cupboard in the landing) is hot but I would not say it is very hot...

thanks @Mr Chibs. What would be the next thing for me to check?

thanks @Lower. Attached is a photo of the flow valves I took yesterday when the system had been running for 2 hours. The pipes immediately below these valves were warm to the touch but not hot. Stupid question but which are the pipes on the return side? One thing I did notice that after the...

thanks @Madrab. From the photo, can you let me know which gauges I need to check? I have attached a photo of the blending valve (assuming this is the correct one). It appears to be set to 'Max' as I cannot turn it any further anti-clockwise. Can you point me in the right direction for looking...

thanks @Madrab. The photo was NOT taken when the system was running. It was taken when the system was first installed. Shall I attach a photo when the system has been running for 20 mins and then another photo when the system has been running for 2 hours but has not yet reached the set temperature?

I recently had UFH system installed in a newly constructed orangery. I ran the UFH system today for the first time. The room temperature was 20.5C at the start and I had set the thermostat to reach 22.5C. After 2 hours of the UFH system running, the room stat was showing 21.5C but all the pipes...