dpmiller

Do you know what an automatic bypass valve is? Was the engineer ever present at 3am when the temperature was low enough to bring on this issue?

IIRC manometer fluid for the sensitive inclined filter loss gauges is basically white spirit with dye in.

And also with respect, you don't know with certainly that what you just typed is correct *unless* you wade through all the other stuff. How do you know an in-house sensor isn't reading the temperature wrong, and telling the pump to run? You don't. How do you know what flow restriction there is in the rest of the CH circuit that could be making the pump unnecessarly noisy if it *does* run at night time? Modern pumps automatically vary their speed- they don't have "gears", they're CVT automatics. Can you be sure a zone valve isn't wired wrong and is forcing the unit on even when programmed off? None of these things are inside the ASHP or in the manufacturer's pervue.

exactly the same as any capacitor-start domestic fridge. To be fair, the overload relay will protect the compressor...

You could start by understanding the plumbing of the central heating system in the house and how this interacts hydraulically and electrically with the (totally seperate) ASHP gubbins? Thermostats Zone Valves Bypass valves motorised valves Non return valves TRVs CH circulating pump(s) and confirming where exactly all the flow and temperature sensors for the ASHP are installed in relation to the above. Remember that the flashy boffin-top-engineer types that work for the manufacturer only know *their* bit inside out. Not whatever disaster of copper may have been shoehorned in by your so-called "installers"

we're all just cheaping out really. All the "real" pros use Milwaukee or Festool...

SO many things about the current system a proper heating engineer could check...

Like a gas combi then?

I wonder if somewhere in the house gets cold enough (can't remember where all the sensors are) overnight that you're getting in-house frost protection? I think that's 5 or 7C for the average programable stat...

soapy water is the old angler's trick to bring them up

Spuds, to break up the fresh soil

why would they fall over? Plenty of internal walls are unsupported single block...

There are basic digital stats too, but if you're thinking about zoning then it's a no-brainer to go programmable...

Ask yourself who Neff are, while you're at it...

yep, could be so simple.

Bear in mind that defrost and anti-frost are completely different things, not to be confused.

In a split system, there's only refrigerant gas in the outdoor unit and the pipes to-fro. If the *indoor* unit is going into anti-frost it must be because it thinks somewhere *inside* the house is dangerously cold. In the proposed replacement system, antifreeze is circulated between the indoor and outdoor units. However because no-one can guarantee the right concentration of glycol has actually been filled, the Outdoor unit will occasionally pump between the indoor and outdoor units to take the chill off the fluid just-in-case.

I wonder if all this noise in anti-frost mode is because a motorvalve is closed (as there's no heat demand)?

I don't undertand why appliances have to "match". You want the best tool for the job each time. We've a Panasonic flatbed combi, and it's superb. Sees way more action than the oven in the cooker...

...and under, as well. most fridges are pretty open underneath and a nice reflective tiled floor will cause issues for sure.

Yep, cold rooms and lab -80s have those.

The Liebherr probably needs a new fan, if it's sitting up on top of the unit...

the answer is yes. Ish... I don't know if any domestic refrgeration has anything other than a piston compressor, and they're all "hermetic", that's the metal can it's sitting in...

I went with a Samsung F/F a few months back with an inverter. While it's certainly not silent, it makes a different selection of noises to an old-fashioned refrigeration unit. There are no sudden clunk/hums as the compressor starts, but as the compressor is variable-speed the hum ramps up and down markedly. Anecdotally, the more modern refrigerants seem to make more noise as they make their way around the innards of the appliance, and frost-free means you're going to have one or more fans whirring away inside...

Likewise, but for no qualifiable reason.