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Firstly I am a heating engineer so my question is to satisfy my own curiosity, I have been working on a small terraced out getting it ready to rent out, sadly its had a warm front fitted heating system, so I have had a few issues to correct. The electrician on the job had a few more issues...

Well mate, I've been to a job that might be one of yours, electrician fitted an oil boiler and unvented cylinder 1. No oil filter 2. No fire valve 3. Condensate incorrectly fitted 4. Discharge pipe incorrect size and terminated incorrectly 5. Vent pipe on heating incorrect size 6...

you need a gas safe registered engineer to take a look at it, it's not something an untrained person should be messing around with. I know it is probably not what you wanted to hear but it is the safest option, you could ask on here and see if anyone is local to you that can look at it.

agreed hence why I think it is new boiler time, it's a hell of a job to take on

its not a common fault, just one I have come across in the past, when I looked closely at the pressure sensor it had sprung a tiny leak and shorted out across the wiring, not say it is that but it's too simple not to try it :D

I would disconnect the pressure sensor and see what happens then, if the pressure sensor goes it looks like a board fault when it isn't. The pressure sensor is easy to spot, pink salmon colour. it is one of the first things I test when I go to a glow worm with what looks like a faulty pcb...

replace the boiler, it's time has come to pass to the other side, they have had there money out of it :D

Try removing the connection to the pressure sensor, think its a pinkish color, if everything comes back on then you need to replace it, sometimes when they fail it looks like a dead pcb when infact it is just the sensor

You have just told a diyer to take the fan out!!! Can I strongly advise you do not do any of this!!! Get a better boiler engineer, if he needs tech guy to say pump is at fault and just changes it his no good!!! Pumps are easy to test

ditto, keep what you have :D

you need to put a stop to the dripping valve in the room you mention, then you can see if that stops the system pressure going down.

if you decide to call someone in, you will need a plumber with the unvented ticket

I always thought the Biasi was a good boiler that was mostly fitted badly. I think the older models where the better ones, think they use plastic on there hydraulics group now instead of brass.

best advice, stop being tight and get some one qualified to work on boilers to fix it for you. Do you carry out the usual checks that an RGI would when replacing the components?

totally agree, blocked feed.

your not going to get much help on this one, best advice I can give you is get a registered installer in to fix the problem. You can check the thermocouple with a multimeter, should be getting around 30mv, but you should not be changing it yourself.

We call them ravenheap!!!!! Personally wouldn't touch one unless am repairing it!!! always plenty of ravenheaps to repair!!! it uses a recuperator which tend to leak!!!!

sorry i think I may have mislead you a little when I mentioned unvented, I was only using it as an example and not something for you to be bothering with. Let us know what boiler you have there, I pic from inside your cylinder cupboard would be a good idea!!! :D

if it is an air button it probably needs new bellows