---broken again see 5th post down!----
i have a Worcester 24CDI, yesterday i flushed the system using a hose on the flow and one on the return (boiler return valve in off position) turning all but one radiator off individual/ly, and addeded some TRV's whilst i was at it (not to every radiator). repressurised and blead all last night. Heating and hot water working great last night and this morning.
then this morning i part drained one radiator, and added chemical treatment (wickes) in view of flushing it again in a couple of weeks and adding inhabitor.
now the boiler has stopped working. turning on the hot tap it all works for a bit then the flame goes out and it goes cold!
tried to reblead the pump but just hot water comes out and it very hot.
pressure is at 1.1 bar and raises to about 1.4 when system is running. (edit-now goes to about 1.9 before boiler shuts of on dhw, i presume to overheating as the pump gets v hot)
what can i test? (i have a multimeter and know how to use it if that helps but i expect its something mechanical given the scenareo)
the system wasnt in that bad state its just i had to put a radiator back on after decorating so figured i needed to top up with inhabito and may aswell flush it first!
one thing i wasnt completely sure on is bleading the pump. i undid the screw on the front and took it off untill just water was comming out and replaced it. -is that right shall i do it again once its cooled down?
edit:
i think the pump works still as when i turn the system on i hear it go with a swoosh noise (i think from the expasion tank)
looking at it again it looks like i didnt run the heating for long enough afterwards, it says to 'turn the boiler on then blead radiators again after an hour' (so technically it doesnt say to turn the heating on!), looking at the timer it will have run for about 15 mins give or take. -had the blocked something? -what would it block? -heat exchanger?
edit:
Ive now put the C heating back on to try and shift it, pump is pumping and flow pipe is hot pressure staying steady (even when burner come on -but it doesnt stay on for long i suspect because the heats staying where it is!) rad pipes havent got warm yet which i would have expected (been on 5 mins).
Edit:
think it may be sorted, the rads stayed cold for ages, but now they have started heating up and the burner is staying on ( iwill leave on for at least an hour!) and the pump has quietend down.
i think it was a case of the radiator i poured the chemicals in was probably the worst as it has been sat in the garage for a few months (i did run a hose thru fisr but that wont of got everything) so the chemicals will have got the rust of the inside quick then the heating ran for a short time and turned off dumping it all in my heat exchange blocking it. persistance seams to have unblocked it so i will see how it goes.
Edit: DHW works fine now also -flame stays on and pressure stays stable. will leave heating on for 1.5 hours and all should be good i hope!
(edit: thought CH had stopped, but someone had turned thermostat down, lol so situation is still as above, wasnt working now is so all should be good if i leave it alone!)
edit: CW and DHW been working for over 1.5 hours now so I am assuming it is sorted!
i have a Worcester 24CDI, yesterday i flushed the system using a hose on the flow and one on the return (boiler return valve in off position) turning all but one radiator off individual/ly, and addeded some TRV's whilst i was at it (not to every radiator). repressurised and blead all last night. Heating and hot water working great last night and this morning.
then this morning i part drained one radiator, and added chemical treatment (wickes) in view of flushing it again in a couple of weeks and adding inhabitor.
now the boiler has stopped working. turning on the hot tap it all works for a bit then the flame goes out and it goes cold!
tried to reblead the pump but just hot water comes out and it very hot.
pressure is at 1.1 bar and raises to about 1.4 when system is running. (edit-now goes to about 1.9 before boiler shuts of on dhw, i presume to overheating as the pump gets v hot)
what can i test? (i have a multimeter and know how to use it if that helps but i expect its something mechanical given the scenareo)
the system wasnt in that bad state its just i had to put a radiator back on after decorating so figured i needed to top up with inhabito and may aswell flush it first!
one thing i wasnt completely sure on is bleading the pump. i undid the screw on the front and took it off untill just water was comming out and replaced it. -is that right shall i do it again once its cooled down?
edit:
i think the pump works still as when i turn the system on i hear it go with a swoosh noise (i think from the expasion tank)
looking at it again it looks like i didnt run the heating for long enough afterwards, it says to 'turn the boiler on then blead radiators again after an hour' (so technically it doesnt say to turn the heating on!), looking at the timer it will have run for about 15 mins give or take. -had the blocked something? -what would it block? -heat exchanger?
edit:
Ive now put the C heating back on to try and shift it, pump is pumping and flow pipe is hot pressure staying steady (even when burner come on -but it doesnt stay on for long i suspect because the heats staying where it is!) rad pipes havent got warm yet which i would have expected (been on 5 mins).
Edit:
think it may be sorted, the rads stayed cold for ages, but now they have started heating up and the burner is staying on ( iwill leave on for at least an hour!) and the pump has quietend down.
i think it was a case of the radiator i poured the chemicals in was probably the worst as it has been sat in the garage for a few months (i did run a hose thru fisr but that wont of got everything) so the chemicals will have got the rust of the inside quick then the heating ran for a short time and turned off dumping it all in my heat exchange blocking it. persistance seams to have unblocked it so i will see how it goes.
Edit: DHW works fine now also -flame stays on and pressure stays stable. will leave heating on for 1.5 hours and all should be good i hope!
(edit: thought CH had stopped, but someone had turned thermostat down, lol so situation is still as above, wasnt working now is so all should be good if i leave it alone!)
edit: CW and DHW been working for over 1.5 hours now so I am assuming it is sorted!