MegaSack DRAW - This year's winner is user - rgwb
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Problem
Have to keep bleeding the same radiator about every two weeks.
About 2/3 months ago we had new thermosats fitted to all the radiators. Didnt notice it before, although this is the first winter in the house.
The boiler is an Ideal ???? about 7/8 years old.
I cant see any leaks. Someone said it could be the radiator rusting inside, but why would only one do it. Its not even the highest point(Bathroom has a towel ladder radiator) it is upstairs though.
Any ideas that don't involve getting an expensive man out.
open loop or closed loop system? if it's open loop it could be the last one before the expansion tank and on the system cooling it could be drawing air back in though the overflow/expansion pipe.
Or your steel rads are rusting and hydrogen is collecting in that radiator. Try igniting the gas that hisses out of the bleed screw. If hydrogen, it's time to add some more antioxidant in the form of Fernox to the system. Maybe the plumber who fitted the TRVs forgot to add it.
Try igniting the gas that hisses out of the bleed screw.
Ensure you film this!
Nothing will happen if there's no oxygen in the mixture.
it could be a micro leak in the heat exchanger....
do you have a hot water cylinder.. do you have one or more cisterns in the loft..
Its a closed loop (condenser boiler so no tank)
I tried the flame thing and almost sure the flame was blue.
So do i need to clean out the whole system then put in new stuff or can I just top it up?