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Those look correct -while you have boiler drained fill up the expansion vessel with compressed air to 1.0bar pressure, hopefully that will stabilise your water pressure loss problem although the flex hose connecting the vessel to the boiler may also be blocked :wink:

Isn't it obvious?? some of the thermic actuators have failed and have simply been removed!! you will need to obtain some new actuators to replace the missing ones! so Simple! :shock:

Which makes you as bad as your Plumbert!! :roll: :lol:

UPS2 has had problems your merchant won't be suprised to get it back other makes of pump are also available :wink:

Surely a "BOULTER" Buderus will be an Oil fired Boiler probably a Camray Combi 90A??? I know that BG are "playing" with oil fired boilers these days! :lol:

Could it be our old friend "Mr Frost Stat" :roll: :lol:

New boilers are made to comply with CURRENT Building Regulations concerning energy efficiency Gravity is no longer allowed except for solid fuel appliances so in answer to Q2. no gas boiler will be suitable :wink:

A bit more info on your system would be useful such as type of motorised valves if fitted, some pics of vital system parts would also help, oh and is your boiler a conventional or combi type? :?

You can keep the return in 22mm, but the HW return must be nearest the boiler to avoid reverse circulation :wink:

If it will not prime, you should get an engineer out who will use a vacuum pump to pull up the oil (cheaper than replacing a fooked BFP41L3 pump!) moral of the tail - people with oil fired boilers on the 1st floor should NOT run out of oil! :wink:

In the UK the common domestic fuel is Class C2 Kerosene (28 Second) fuel used in commercial appliances is generally Class D Gas oil (35 Second) In France the common fuel is Mazehout? which is around 32 Second so between Kero and Gas oil in density, your big mistake is expecting a UK boiler to...

Customer from Hell? :?

And NEVER ignore an erreor code they can provide an attending engineer with valuable information :wink:

Video is pretty poor quality, but it looks like the pump might be pointing down slightly, the front of the pump should be very slightly ABOVE horizontal, if the motor is pointing downward it will make the noise that you are experiencing :wink:

Indeed you can BUT it would still need someone with test equipment to make it work! :roll:

If you are saying that it has locked out because you let it run out of oil, you may get it going by removing the silver plug below the blue wire in your pic. 1 you will need an old towel or similar to catch the oil and froth that will flow out, replace the plug afterwards, making sure you have...

Has he left the temeperature switch on the "LOW" setting, Apollos nearly always have to be set to the "HIGH" position to be of any use! otherwise it sounds like a circulation ptoblem due to air, three port valve or pump, as you already know about an issue with the 3 port, I would get the guy...

I estimate that around 80% of "A" rated pumps, fitted as a replacement for an older type, will have to be set to Manual mode, simply because of the pump over-run or frost stat issue, what is ridiculous is that when set to manual, "A" rated pumps use up to 25% more power than the older pumps :?

I seriously doubt it!! :shock:

First I've heard of this Andrew any chance of gaining entry (I'm not wearing Trainers!) :lol: