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If it's not the PCB I'd say it was overheat. Check the thermistor is clipped to the pipe properly and that it's not corroded/damaged etc... If the PCB sees the overheat stat is reading 90C but the thermistor is reading below 70C it assumes there's a software fault thus giving LE. I had...

The pump isn't at fault, I'll be one of the 2 port valves sticking intermittantly. A plumber should recognise this from the description of your fault.

If you've turned it off at the mains and the pump is still running then something is very wrong. Sounds like you need another plumber to take a look.

Sounds like a simple fault to resolve, you probably have a sticking end switch in one of your two-port valves. Have any plumbers/heating engineers actually looked at it?

Probably because it was second hand. I'm sure regs say that fitting second hand appliances is allowed... might be wrong.

So the guy refused to tell you?

Why?

You need a new heat exchanger. I'm afraid I don't know much more about this, it's a familiar Worcester fault though. Give them a ring. If they do a fixed price repair I'd go for that.

It could be the sensor but you might want to recharge the expansion vessel too.

Of course it's experts! They designed the boiler. What do you think engineers do when they can't solve a problem? You'll need a new PCB.

This is a known issue on the combi version of this boiler and it's sorted by pressing a sequence of buttons on the fascia. Obviously you don't have buttons so you can't do this. Give Worcester a call to see if there's anything you can do. If it means a replacement PCB I'd leave it until it...

No Get your house as well insulated as possible, have TRVs in the sleeping areas and a weather compensated combi (depending on your hot water requirements) as described above.

It's starting to happen a lot on the Juniors, I've changed a few now! Worcester recommend fitting a PRV and mini expansion vessel on the inlet. Not sure if this would effect a warranty claim...

I'm not sure of any specific books or articles to guide you too but you can try doing a search for "weather compensation" "modulating heating controls" in both this forum and Google. http://www.glow-worm.co.uk/products/combination-boilers/ultracomsub2-sub-cxi/...

You can just change the diaphragm. Much easier and cheaper.