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Has everybody forgotten tallow & a gimlet?

Could be one of the end switches is faulty as boiler shouldn't fire without one of valves being fully open. Assuming it is wired up correctly

An oven may also be connected via an 8mm or 15mm rigid connection

Why not just swap the head (remove the 4 allen keys & it will come apart with a bit of coaxing)

Also against water by-laws to solder water lead

Why would you even consider a biasi

Is pump running also fan on high speed

Probably pump blowing fuses try disconnecting live to pump & see if it carries on blowing fuses

Oops made a buggar of that Will i agree with tony that fan failed but disagree that it is unusual. I carry one on my stock & generally change one every 2 weeks or so. But that may be because we have a lot of vokeras thup north with our cloth caps & whippets

Definetly diverter valve you will probably have one of the aerlier ones (around 5-6 years old) with the small holes drilled into the body

Have you considered that the kitchen tap may be faulty does it only dribble out (you will need approx 9 litres pre min which is a litre jug in about 6 secs)

Incorrect transco are responsible to reconnect internal supply if they decide to move meter

Run hot tap & observe temp on display (it reads dhw temp) as soon as blr shuts down then immediately turn isolating/filling valve from 12:00 position to 06:00 position which stops water flowing. If temp display goes up to about 82 degrees then your plate heat ex is blocked probably with magnetite

Is you cylinder primatic (it may say on it self priming)

Diverter valve reqd but you would probably be better off spending money on new vaillant or worcester

Snatching it is possible but i wouldn't risk it unless maybe under floor better to bung it or drain it

If you only have a cold feed to cylinder (22mm) then you may have a sealed system do you hav a small c/htg header tank in loft?

Try b.g. they will do a fixed price repair (parts & labour) for about £150

If you move pump then you must also move the cold feed & expansion pipes & have no valves from expansion pipe