dpmiller

remind us what "stop temp differential" you're set to- increasing that a degree might well save ploughing through the PID stuff too much

you can easily shift the ambient probe clear of the evap.

^ breaks down a lot, dealer treats you like cr*p?

^ yep, E7 timing is preprogrammed into our dual-rate meters over in NIE land too

yep a couple of hundred K would be worth a try, it's what we would fit across a starting capacitor to ensure it discharges. Or an old-fashioned pygmy 15W filament bulb?

the LED driver is slowly charging up until it fires. A suitable resistance in parallel with the driver should stop it, but this is one of the many issues with switch-mode power supplies. A different brand of driver may perform differently too...

sorry, yesterday ended up being a 600-miler... Unsurprisingly it's actually Hager like the rest of our stuff https://www.directtradesupplies.co.uk/product.php/189877/hager-6a-2-way-ceiling-switch--white-

who did the install? Our guy was very open about his calculations, pointing out every high or low spot on the PIR. The subfloor was poured as three slabs and the middle one ended up with a bit of a dish, so our hallway has closer to 65mm.

I tried a few cheaper options until I found one that was reasonable light and quiet. I'll update later when back at home with make and model

do they use foam any more? Isn't it generally a synthetic felt-like layer now?

are the red caps on the MVHR ducts airtight?

surely "above ground" means exposed to sunlight?

short term you could just screw a car valve cap onto the outlet?

No idea how the numbers work but our PVC centrepivots have pretty complex seals, one wiping, one compressive .

yep sounds like blockboard.

are they like-for-like, both with top vents?

^ wot he says. But help us help you here- are there any pole transformers or cabling in the vicinity already? Distance? Photos?

We've got the PVC frames and they're very good. Obviously they're near-enough maintenance-free, and are clean and bright. You'd need to go digging to confirm, but they're probably a bit better thermally?

can you post the diagram and a photo or two of the board,for us to chew on?

Fake wood venetians from Blinds2Go here. They're a bit heavier than aluminium but are plenty rugged and the customer service was great.

no chiselling required 🙂

not so unusual really- bottom of stair, top of stair, far end of landing...

No idea sorry, I use them only for gross leaks of anaerobic gas mix as only the small percentage of hydrogen in the mix is easily detected.

a "normal" cheap heated catalysed pellet sensor will do fuel gases

you're overthinking. Having spent more than ten years measuring flows in fume cupboards, Biological safey cabinets, and various laminar flow units, I can confirm that airflow is just-about impossible to read repeatably... Flow in any tube/ duct is irregular and as @S2D2says the longer the straight length before the probe the better. You can use egg-crate to try and straighten/ laminarise the flow, but it's all over kill. Probe in the centre of the duct, fix it there, take readings. Done...