TonyMorris

Thanks! To avoid a more serious effort might something like this work? Polar Premium Leak Seal Grey Paint - 1 Litre - Instant Waterproof Roof Sealant - Ideal for Leaks, Cracks & Roof Repair - Concrete, Brick, Metal, Drainpipes & Gutters - Easy to Apply https://amzn.eu/d/bPLytpJ

Hi, it was done by the previous owners so I’m not sure - but I’d presume soil drainage (the tree is huge) and no liner. Thanks!

I have a white wall that surrounds the base of a tree. The paint started bubbling so I stripped it back, filled it, used stain block and used masonry paint. It looked great for a few weeks and now it’s yellow and damp once more. What else should I do!? I don’t mind a bodge that needs redoing every year or two, but every few weeks is too much! I think it’ll always be damp… 😬 any advice appreciated!

Ok, latest update - definitely not a pre heater issue as it’s disconnected, but I did discover the outside wall vent was very dirty at the air intake. So I’m hoping that a lack of air coming into the unit was somehow meaning the exhaust air was receiving the heat that was meant for the fresh air. that may be impossible but it’s my theory! Will post more here if I discover something else 😊

Thanks - I’ll see if I can find anything on the preheater settings (or maybe I’ll disconnect it!)

I suspect the inside air sensor is in the plant room (will try to find it) so may not represent the true temperature in the rooms (17/18 is more likely)

It's back to cold again this eve... a riddle

I feel like the heat exchanger is working back to front or something like that... but perhaps that's not possible!

Ok, so the sensor is correct. I put my hand around it and the temp went up and down. It might not be calibrated fully, but it's about right. The big riddle though is... when I put my hand into the fan air (see the photo where the fan is not connected/sat properly) it seems to be warm. So where is that heat coming from!? I've literally no idea. The vent at the side of the unit seems clear. I'm very confused!

I'll try pulling the exhaust sensor out of the duct to check it - will keep you posted! Thank you. I'd laugh if that is the root cause - the guys who installed this also managed to make a real mess of the heating controls (different system) so I wouldn't put it past them...

Here's a video of the settings: https://streamable.com/a6nrck Thanks!

I think it's plumbed in correctly (or mostly correctly), also as this is not always a problem.! Will take a video of the settings and the unit and see if that prompts anything! Please standby...

Hi, I'm hoping to get some advice. We have an Airflow DV145 MVHR. I have a problem with the exhaust air being warmer than the inside air but no idea why. Airflow technical support weren't very helpful either. It's bizarre. What tends to happen is when the front cover of the unit is opened/the system is off for 10 minutes then the readings are reset and the exhaust air is cool for a while. But 'sometime' later (even sometimes only after a day or two later) the exhaust air is showing as warm again. I thought it may be a problem with the extract air motor warming the air, but the unit power is only 20W so I think that's not the issue. I had the bearings replaced in case it was somehow friction, but no luck there either. I'm wondering whether the heat recovery is working in reverse or there's a blockage or something weird in the airflow? But then why is usually fine 'for a while'? Any ideas!? Thank you!!