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We have a 8 year old sealed CH system. Everything works fine, but occasionally it will 'spontaneously' drain itself. It's been doing this for a while (ie a couple of years). What will happen is that it runs fine at 1-1.5 bar pressure, then the next morning it won't come on automatically. We...

Argh! I'll fix it! I promise!!!

I can see a date code (if there is one) on the CU helping there (but I could have had it in a box for a while..) Cable colouring changed in 2004 and AIUI the old colours were allowed until 2006, so that's a bit of an iffy check, since Black/Red cabling could have been used after 2005 and...

I did a lot of electrical work in our house (replacing the CU, fixing errors in the existing circuits (radials with 32A fuses, lighting circuits with 16A fuses etc), adding sockets, rewiring kitchen, adding power to outbuildings etc) when we moved in 10 years ago (and subsequently as we found...