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offcourse my multimeter is very well used , why do you ask

dhw plate to plate heat exchanger is blocked, hope you have new washers with your new one. dont try to doit your self gassafe web you can find a local engineer.

i am a bit out of touch with prise as i dont do much private work, only for friend & local work. but i think £50 would be resonable for a diagnosis if you were to find someone local. we all have to think about fuel of course

it only takes 30 sec to find a qualified engineer on the gas safe web. all engineers have to take extensive essessments which costs alot of money & if you have a local engineer he/she will reley on local buisness and do a good job for you. sounds to me that you havent had iyour boiler maintained...

Look at the gas safe web site , looking for a local qualefied engineer.

leave the boiler for a qualified engineer. your fault with the O/h stat tripping is not at the boiler, check the pump prob weak as hell causing the boiler to overheat, and get an engineer to put a new HT lead on the boiler when he replaces the pump for you.

go to the gassafe website type in your post code and get a list of qualified engineers to replace. dont try with diy or you will get wet.

agree divertor passing.

try removing the spring

your condensate is backing up into the sump , so the condense system requires clearing & anew burner gasket ,you must get an approved engineer, look up gassafe web to find one.roughly 20 quid for the gasket & 60 for labor .

the isolation valves i believe are the ball valve type which will leak if touched ,best drain , vent from the screw at the front of the pump

thanks for the debate, i will question this further. i agree with you namsag there should be an official document , just going on advice from manf.. a full weekend off work, and yet here we are. love this trade, always learning

i never said they need to be chanced, they are a very good boiler and willl go for years, just not very efficient compaired to a modern boiler , with older boilers its important to know where acm are so they are not disturbed. recamend you check for your self with manf most stopped using...

gasright . yes i was very suprised to find out acm within the baxi bermuda 401, as i have serviced reguraly for years

the grafite gasket is eather a replacement or could be a later modal , manufactures will be quite happy to go through arcives.

not all appliances on list but confirmed with baxi with the 401 as far as i know its the burner gasket

has the link been removed for system ctrls

sorry try this http://www.stop-think-asbestos.co.uk/pdf_downloads/GAS_ELECTRICALAPPLICANCESLIST.pdf

try to google it

found it in the manual , much appreciated