AhMario

Still no success.. I checked switches configurations in external unit and branch box, everything seems ok. I tried the temp increase check but it did not work. BUT I discovered something difficult to understand: now the system would not even heat water for UFH… If I set mode to heating and Inset target water temperature higher than current reading behavior is same as the one I am experiencing for cooling: everything in standby.

Thanks, I will check both items!

Hello all, I am writing to check if there is someone who maybe went through the same case I am in. I have a UFH system based on Ecodan internal unit (ERSC-VM2D.UK) and PUMY external unit (PUMY-125VKM5). Heating in winter is working very well and energy usage is so far quite low, I am very happy of the system. Now I would like to use the system to cool the house using the UF pipes but I am no pager sure it is really possible.. I did the following 1. enable cooling mode in Ecodan by setting SW4 switch 2. Switched operating mode in Ecodan to cooling and I set target water temperature to 16c, 10c less than current temp. the result is that the cooling never starts, no error in display. Ecodan display just permanently shows the “pause symbol” next to the cooling icon. I tried to force external request of energy by closing circuit on ecodan IN pins, the pump indeed starts but the cooling still stays in pause. has anybody succeeded in using this PUMY external unit to cool water? I start to doubt that this is not possible.. 1. In the design phase technician told me that this would be possible. 2. Mitsubishi staff is now saying that the external unit does not support water cooling and the only way to use it to cool something is to add branch boxes and splits 3. Mitsubishi website states that water cooling is possible for this very external unit

Hello everyone! I am writing from Italy. I decided to register because I found a lot of valuable information in this forum, nothing that I could find elsewhere. by the way congrats for the forum and thanks for having accepted my registration. I am not a professional builder, my job is more in cyber security of vehicles and I studied maths before that. With my family we live in a house where we recently did extensive renovations. This is a high efficiency house with electric heating, solar panels and insulation of the walls. in many cases I like and need to figure out what’s is the cause of the issues sometime happening in the house. Here in Italy it is difficult to find personnel with a level of expertise high enough to manage complex systems.. thanks again and happy holidays