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Vent Axia Sentinel Kinetic Advance S (405215) - The installation engineer has come back quite a few times and Vent Axia came on Monday but it's still not clear why I have this problem. Wondered whether anyone has any suggestions? In colder or wetter weather (maybe both?) I have water leaking out of my MVHR unit - I've had it leaking out of drain and front of unit. Also the heat recovery seems very poor to me (eg 0 degrees outside, supply temp 11 degrees, room temp 20.5 degrees). And the machine reads a significantly higher RH than my hygrometer in a bathroom and the house doesn't feel damp (eg. 76% vs. 66% RH). First of all it seemed to be working brilliantly and condensation disappeared overnight (weather was warm for December), supply air was around 19 degrees on the app. We had a very cold spell in January and I don't think it's been working right since then. We also had ASHP installed at the start of the cold spell. Last Friday it was leaking out of the front of the machine near the bottom. I took the cover off and removed the heat exchanger which had condensation on the outside and lots of water slooshing around inside it. I tipped it up and emptied most of the water out. There was also water in the RH (unused) drain which there shouldn't be as the unit is left-handed. I removed the RH blanking cap and got rid of the water. I poured a jug of water and Milton down the LH drain - def not blocked. This week I removed the drain cap on the RH side and put a bowl underneath because the unit still sounded very wet after Vent Axia visit but since I drained the water that was sitting in the RH drain there's hardly been any water from the RH side (over 2 days). The weather has been warmer and dryer. I put the RH drain cap back on today. I have the installer coming to fit a drain on the RH (supposedly redundant) drain. VA engineer thought this might be a good idea even though it shouldn't be needed. The unit can be left- or right-handed depending on where you vent to the atmosphere and you use either a left or right drain. Background: I bought an MVHR system from BPC and had it installed by someone BPC suggested in December 2023. retrofitting a 1961 bungalow, 134 m2 main purpose - to get rid of condensation problem and allow me to get more airtight secondary purpose - heat recovery (save energy) unit and ducting in cold loft, ducting is insulated (25mm foil backed glass fibre - should I have got 50mm? I was told no one uses that) unit is mounted on the north gable wall (brick) this is a branched system with 125mm METAL ducting (my choice) 4 extracts, 7 supply vents commissioned normal extract 35% / supply 55% speed setting boost - extract 45% / 56% supply speed setting condensate drains into a gutter (under the eaves) because there isn't a bathroom near enough to get a 5 degree fall I changed filters a few weeks ago as they were very dirty.