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last night boiler stopped working altogether and dirty water was flooding from the over flow pipe...

gaz - I have relieved the pressure to around 1- 1.5. Is the thermistor or plate to plate easy to change? How do I tell which it might be or do I need to change both?

Central heating works fine. Hot water works fine in kitchen but not in the bathroom. Boiler keeps turning itself on and off when hot tap in bathroom is running. Please help!

Brittony 80 Combi Pressure 2.5 bar (too high?!) Hot water goes cold when showering, then heats up again, then cold, then hot again! Not so bad in kitchen. Valve to adjust pressure has seized up?! Can anyone offer some guidance and direct me to an online service guide...

how do I know if the system is mucky? is there a way I can confirm the corrosion and know what parts will need to be replaced?

yes losing pressure when cold. i did think it could be the gauge as it didn't move for at least 20 mins when i first filled. but does this explain the loss of pressure? there doesn't seem to be any water leaking from the boiler...would I see water if it was the EV?!

Cheers for literature link Simon. I will try to find the expansion vessel topics on the forum...

ah could be will check again and let you know...thanks

ok cheers. if it's the copper pipe I am thinking of, it maybe a problem, as it goes outside down the wall and straight into the ground... if it is what should I do, if it isn't what should I do...?

Worcester 28cdi Pressure was on zero, not sure how long for. Filled it with key but dial didn't rise. Pressure slowly went up to 2.7 Vented nearest rad. Pressure went down slowly to 1.5 over the next 2 hours then to 0.3 overnight. I am right in assuming this is not...