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cut it off and fit an RV35 manual vent. leave a 150mm leg on it for air to build then the rv35 on top of it. then bleed as and when needed.

if you have the skills to swap the mcb try a basic continuity test on the circuit for a dead short,other than that its just a case of find the fault.

what size cable is it ? a test on the circuit should fix it very easily but you do need the right tools for the test.

can a badly painted wall burn a house down ? does bubbles in a wallpaper give you an electric shock ?? i am guessing by your name you are an electrician, seems strange that you take this stand. i wonder how many lighting circuits have had people pull off a socket in a roof space, or re...

general rule of thumb 3 amp to a f/spur 5 amp to a 3 pin plug.. (dont know why) i always use a 3 amp .. usually plenty .. but yes as you say oil can be 5 amp .:)

does not matter which you use. also open the hot water to might as well fill it all correctly. ideally place a piece of copper in the both valves say 4 inch long.. then using a push fit straight coupling into the hose. you could then swop them as you see fit also you can test the system...

what sort of temperature is the water coming out of the boiler. ?? sounds strange that a new system would do this .was all the pipework changed or re used. if re used was it checked for sludge etc .. this can build up and cause problems later in life.

if you clean up or down you still have to go on the roof to check the pot. i clean from the bottom usually but sometimes an appliance does not have a facility so then i sweep down . :)

open the zone valves manually to check them. using the steel lever on the side.. depending on the model. and yes you can do this alone .. if the tank over flows it should escape down the over flow pipe if fitted correctly.

as above the thermostat controls a zone valve, might be better to buy a controls pack and get some one to fit that for you. alternatively place a timer on the plug and turn down the boiler stat. this would give you heating for a couple of hrs during the time you are away .

yes bleed when the system is off, you have an air lock most probably .. turn the rads off that are working and the cold ones should come hot then let them run for 1.2 hr or so. balance the system.

a low head can increase sludge build up due to pumping over and a\ir being introduced to the system... i would fit an airjeq or higher the tank. also balance the system and check the pump settings.

remove the 13 amp... should be a 3 amp... all separate plug heads . best temporary way is plug the boiler in. plug the pump in . manually open the zone valves. the heating will work then only on the boiler stat but will get you through xmas.. this is purely temporary and should be...

sounds like an air lock in the primaries or seized pump. its very hard to tell without seeing it . but i would go for air.. i would say it is coming to temp and the boiler stat is shutting the boiler down. after 10 min it has cooled enough for the boiler to re light. then off it goes...

i agree . :) it is good to stretch the old grey stuff now and again . :) and with over 8000 posts obviously a knowledgeable lad to . respect m8.

serves him right for picking your brains then getting an idiot in :) i love it when this happens it gives me great pleasure.

spark you obviously know your stuff and i am really not looking for the usual forum row and general slagging off. i have never gone bigger than 10mm on a domestic property, on testing my work never even been close to looking for larger main bonds. this is a typical earthing arrangement for...

i would run a new circuit to the board and drop on the rcd protected side of the board alternatively protect it with a rcbo, all work in bathrooms need to comply to the special location and notification as you know. connect the shower pump on the new circuit and possibly move the shaver...

TT can be different as you say but 10mm usually is ok. i am talking about the usual 3 bed semi domestic property were things rarely change from the norm. 25mm tails, 16mm main earth conductor, 10 mm mains. anything else confuses people. and yes they can alter depending on the circuit...

its lovely to be back on the forum .... good to see things have not changed without me:) i look forward to joining in the fun.