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So Do i just drain it from that lowest red cock then (return one)? do i not bother with the other 2?

Or does it depend how big the house and how many rads etc u have in the house? i.e I have 10 rads in a 4 levels house from basement to attick.

How do I drain my boiler? I dont need to do it now. Just want to know for infomation purposes so I know exactly how to use my boiler etc. Pics of my boiler are in the first post of this thread: http://www.diynot.com/forums/plumbing/how-to-repressurise-boiler-pics-included.361561/

hi thanks for your help. I managed to fix it. i opened up the boiler and cleaned up a rubber pipe that goes from the right side of the boiler to the centre. and before u know it works like a charm now. As to finding out how to draining the boiler i just need it for informative purposes...

it gives the number 10. i have turned on and off the boiler several times. in still getting the same error. in terms of draining i want to know for info purposes n also want to see if it makes a difference

how do u drain the whole water from boiler?

any ideas????

thanks guys really appreciate the advice. before i got to repressurise the boiler. there was a red light indicating theres a fault with the boiler. so consequently there's not hot water. i repressurised the boiler to 1.5 and in still getting through same error. I've turned through boiler off...

okay thanks guys.... I have 4 floors. with 10 rads in total in the house. Why is 1 pressure best? Normally it''s around 1.5-2 and drops down to 0.75 to 1 after a few months. is 1 the standard for most homes?

also theres 2 black taps which one shall i open

thanks for that. Do i need to connect anything to repressurise the boiler other than the current setup its on.... and what are D.O.Cs?

bumping up for anyone to help me

didnt understad any of that sorry

it goes to 0.75 most okay but for future purposes ... how do i represurise? n drain it?

Hi guys every few months I have realised the pressure drops from 2 to 1. I cant seem to find any leaks or wet parts around the house near piping or heating.... anyways how do I fill the boiler pressure up?? If someone can point it out on the pics I would be grateful.... also if someone can...

can you tell me how to check the flow switch and sensor please... and thanks for the advice above guys... yur right changing it would be better than fixing it!!

heres my combi boiler http://cdn0.vokera.co.uk/wp-content/uploads/2009/04/unica-he-installation-and-servicing-manual.pdf

oh ok i didnt realise I need machines etc. I will probs need to get an expert to do it. I was under the illusion of thinking to put a solution in the boiler somehow and letting it run through pipes etc etc... but I have no idea in this subject at all!!! How much would one of these machines...

Thinking of Power flushing to clean the inside of the boiler cus I'm getting intervals of cold water when i open hot water... How would I do this with vokera unica combi boiler? which is this one...

would i be able to clean it myself? or would i need a pro?