ProDave

My 5KW LG Therma V is 15L per min. Astonishingly, this vital information is not given in the installation manual. I had to seek it from their technical support (when it would not operate due to low flow) Installing a flow meter I would say is absolutely essential. Some heat pumps provide a flow meter but not all.

When we were in the caravan, we set up an old spare BT hub to be a wifi access point. Hard wired tot he main router with am ethernet cable. It seemed to work well. Something similar for you with 2 or 3 of them?

Wasn't there another thread a few days ago about someone killing the same board by shorting out the 12V? First think is check id the 12V DC supply on the board is working.

Just link out the call for heat contact at the ASHP and power it up and see if it works.

An alternative simple test is a simple mechanical thermostat to start with.

Don't discount dowsing rods to look for water pipes.

I presume MCBO you really mean RCBO The one problem with them is when they trip, you don't know if it's tripped because of overload, or because of earth leakage. Do you have any ordinary circuits you could temporarily try it on (or swap the rcbo for an mcb, just for a test)

That looks like the Tower valve?

Missed that bit. Then probably not, I was thinking of the public highway. I smarted at paying £1000 for a 3 metre single track road crossing.

Like I say, remove that room stat and just link it our so it is calling for heat all the time and try again. Does the heat pump start up or even try to start up?

The issue is, for work in a roadside verge, the contractor needs a minor streetworks permit, and will have to pay the council's road opening permit fee. So not all "man and a digger" outfits can do this.

^^^ Following on from the above, you seem to hear some people saying how useless heat pumps are., but that appears to be people that have simply replaced a boiler with a heat pump with no proper regards to any design, and then complain it does not work well. Out house has a maximum heat demand (-10 outside +20 inside) of a little over 2KW which should comfortably be met by our 5Kw heat pump feeding under floor heating ans a large hot water tank ensuring hot water at 47 degrees is okay.

To test the ASHP, forget the room stat, just link it out so the room calls for heat all the time, and establish that the heat pump works first. THEN you can look at the thermostat issue. What is tripping? MCB or RCD?

I did the wiring for a loft conversion once, and on final inspection the BC found the cill of the MOE roof windows was 1" too high. He insisted on a fixed 1" high step being placed in front of the window before he would sign it off.

For anyone reading, in Scotland you need PP for an ASHP unless it is >100M from your boundary. Luckily I discovered this during my planning application and was able to update the plans to include the ASHP. I was previously thinking of a GSHP (which are permitted development in Scotland) but discounted that idea when I found the ground collector pipes and brine to fill them with would cost more than the heat pump itself. I am willing to bet my Fridge has a higher starting current than my inverter driven ASHP but the DNO's do ask on the new supply form if you are having a heat pump.

check VERY carefully with a meter BEFORE you connect it. i.e connect a bit of flex and a plug to provide power to L and N in. Then turn the thermostat up so it calls for heat and measure with a multimeter what comes out of L1 and N1 You don't want to be connecting a switched L to something expecting a dry volt free contact.

But even an English leasehold would give the leasee rights to extend it or buy the freehold. What is he actually trying to achieve?

@Stones do you have a measure of how many KWh of electricity your heat pump is using per day / week etc?

Even the flat we used to own here was freehold. I suspect what they want, and what they can actually have, may not be the same.

We have been living on site in the static caravan for 18 months and now in the unfinshed house. Family life adapts to the circumstances. I would be surprised if there was room on a garden plot for a static 'van, but perhaps it was some sized garden?

@Carrerahill @epsilonGreedy Please refrain from having a slanging match. This is a friendly and helpful forum. This behaviour is not what we want.

I put the heating on here on Friday. Unlike you lot down south basking in summer temperatures still, it was a high of 7 degrees here today after being close to 0 overnight. It's been an average of about 10 degrees for well over a week now. And grey and overcast, so no solar gain to speak of to help things along. Had we still been in the caravan we would have been heating it for weeks now., I am monitoring my energy input and will make a post about it at the end of the week when I have a full week or recording but the first 3 days suggests it is following the expected heat loss model.

Ah, another "southerner"

You can connect it and have it working and giving you free electricity any time, it's just the FIT application that you can't submit until you have the lodged as built EPC. If you are going to do that I suggest your electrician does not connect the generation meter until you are ready to submit the FIT application.

The construction of that is exactly the same as the LED backlight system employed in a lot of flat screen LCD tv's. I have stripped plenty of those down in the past.