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it's 5" then, but if you've got the MI it should be in there on a drawing

picture? what do you see when you take the cap off?

definately the board, had exactly this fault occur on my one at home.

Can you measure the spigot on the appliance? tehe..

sorry, i thought you said you just changed the head..

yeah there should be a little black rubber washer, probably stuck in the old connection.

it might be worth just changing the MCB, is it very old?? they can and do fail. As for the cartridge/fuse blow time that depends on a few things i think. Do you mean a typical thirteen amp plug top type?

each rad will have a thermostatic valve. the thermostat will be on a wall somewhere in your residence..

I've had many vans and i dont like any with an "O" in the name!! (got a car now and have parts delivered to site-benefits of working for someone else in the commercial sector!!!)

if it was your thermostat you would have no heating at all. have you got a pump in an airing cupboard?

the corgi book only says "working pressure at the meter outlet 21mb +/-1mb" that i could find. Is the burner pressure correct?

sounds like it is on its own leg, do you have bigger pipes(22mm) with these pipes feeding the rad teeing off in 15mm. If it is the only rad you will have no flow through the pipes back to the "header 22mm pipe" if the valve is stuck shut. these valves often seize in the summer months then dont...

a TRV is a thermostatic radiator valve, the head will be bigger than the valve the other end and probably have 5 or 6 settng marks on a top you can rotate about one full turn. if you can get the top off (maybe a silver ring) you will see a chrome or brass pin in the centre, this needs to be free...

you will still get water thru if one valve is shut and one open. If its a trv, take the head off and check the centre pin moves freely.

valve shut or dodgy TRV?

You have to have a full frontal lobotomy to drive one of those in London village! all the ones i have encountered seem to have anyway!!! one step off of taxi drivers and pilots of those B*****D bendy buses!

i'd say definately not! its a lot of if's but there is the possible risk of pumping the water from your washing m/c up through the boiler if a drain blocked. It should be on 1 1/4" min 1 1/2" pref drain though a trap of some sort to stop any smell coming up. plus: extra duty on the pump will...

for info, i replaced the controller/pcb and now the boiler works fine.