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Not got keyless entry but when I get out of car after journey the key fob doesnt lock the doors for a couple of minutes. After that it operates fine but its annoying especially in rain

expansion vessel flat or pipe blocked

Prepare to get a mortgage if you need a part as they are VERY expensive

f75 fault is displayed as when pump gets power pcb expects water pressure to change (like a pump proving device). do basics like make sure pump running correctly water clean exp vessel charged correctly pipe to expansion vessel not blocked. have you put the modified part on which involves...

Depends on system type etc which way pump should be pumping ie gravity fully pumped etc need more info but it may be just air-locked is the system full of water at rads and circs at cylinder etc

What system have you got? on an s plan 3 is dhw on 4 is c/htg on terminal 1 is a hot water off terminal which is only used on y plan so shouldn't be linked to live

you old system was called an smc controller system with a smc controller clock which uses a relay to power boiler. As you have now converted to a y-plan you will need to alter wiring centre & change programmer

boiler probably ok only running for a short time because pump not cooling it down have you checked the 3 amp fuse in fused spur (pump may have blown fuse & subsequently tripped rcd)

circulation problem could be pump not running or impellor snapped or the large pipes on lhs of blr could be blocked

Fitting a hob with a flex is not allowed you can only use rigid or semi rigid copper

With that blr system must be fully pumped so i would be suspecting diverter valve

Will need more infi ie fully pumped or gravity what controls you have if any etc.You may be better off changing blr as efficiency will be very low (well under 65%)

There are 4 wires to clock live neutral & the 2 switched wires so to prove clock faulty join 2 switched wires together temporarily

Switch can be operated manually but as there is no movement of diaphragm blr will only pass water to htg circuit anyway

I would be looking at spindle on valve body is it stiff

Either water has got on to an electric component (which may have now dried) or possibly fan or pump taking fuse out when hot

When rads ar totally cold remove the plastic tops from rad valves & feel spindle for dampness it is most likely that a few (or most) rad valves are weeping & when hot moisture evaporates. It is unlikely to be main heat exchanger on a 6 month old boiler even if it is italian

I prefer vaillant around 6 years ago when glowworm cxi came out i was tempted as it has vaillant heat exchanger but when i was called to mend one i dropped down front to see PLASTIC & i hate PLASTIC boilers which is what you have already with your crappateaux

Only legislation change is for open flued boilers only if you have a 8 year old worcester it will possibly be a cdi which only needs compartment ventilation for cooling purposes if certain clearances can't be met.Worst thing that could happen is that you will be given a n.t.c.s. letter

If there is an arrow on trv then flow of water must go this way you might be as well swapping to other side or rotating through 90 degrees or fitting bi-directional valves