Hi all,   Been trying to get to the bottom of why my 16kw lg therma is unable to heat the first floor of my property. We have underfloor heating but only a thin layer of screed (6mm I believe) so the temps need to be fairly high to get any heat into the rooms.   I noticed the temperature of the buffer tank displayed on the lg monitor differed considerably from the temp gauge on the maniflow. If I turn the thermostats off and on the lg stat suddenly drops down to the temperatu