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Vajolirojah

I am looking for some advice please on a persistent leak from our Worcester Bosch Heatslave 12/18 combi oil burner.

At 7-8 years old, the unit was installed with the house when it was newly built at that time. We are the second owners of the property (here 8 months), which was not terribly well cared for by the previous owners; we are led to believe from local wisdom that the boiler was not regularly serviced. The first visit by our service engineer a few month's back confirmed that it looked like it had not been serviced for a long time.

We called in the engineer a few months ago as the system was cutting out - an issue with an electrical relay - which was limiting hot water use (summer). At that time, the engineer fixed the fault, and had to bleed the radiator system as well, as was shocked to see that the pressure vessel was quite full of water and had to be emptied. That was about 7 weeks ago.

All went back to normal until very recently when we noticed water had been accumulating under our floorboards. Cue lifting the floor and the underlay is soaking wet, and mould has accumulated on the floor beneath that in certain parts - so the leak must have been happening for a while. It seems to be warm water, and is enough to thoroughly soak a heavy bath towel in 12 hours to dripping wet. The pressure seems to be fine and hot water is working as normal.

We called our engineer again who didn't really want to go near it (close to retirement) and he recommended another engineer who specialises in dealing with more complex faults. He did say it could cost just as much to take it apart to replace whatever part is at fault/corroded as it would to replace the whole unit.

We are generally handy at home with electrics (qualified sparky) and plumbing, and general DIY but would like to seek some insight before doing anything too quickly.

The other day I was working at the kitchen and heard some strange and loud, splitting/thin crack noises coming from the boiler's direction. It is really hard to describe - like the noise a mega melting iceberg might make!?
 
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