hi all i have a bosch worster 28 cdi combi boiler any way i need to drain system down to add two rads and was thinking of flushing system too. the ? is when i look under boiler where the flow and return pipes go in there are two elbows with a flat screw thread on them are these valves ? and what are there purpose ? and can i use them to stop debri crap entering system when i drain flush using filling loop . love to learn the best way to flush a combi system and rads ? would i be best to close all rad valves and just open one at a time to flush?
? about boiler and flushing
- Thread starter suffolklad
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cheers thanks for that bster so they are isolating valves under my boiler on flow and return valves then?
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Don't do it 
Touch them and they will leak afterwards.
And i believe that the boiler will have to come of the wall to replace them.
Touch them and they will leak afterwards.
And i believe that the boiler will have to come of the wall to replace them.
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internal leak sealer works too
Surely they wont leak? the boilers only 4 or 5 years old, i was told worcester boilers were made well dont say they skimped on the valves? are you trying to scare me lol
I havnt had any problems with boiler since fitted , just locked out once after i had it serviced lol . Perhaps it doesnt like being touched, I read the manual to work out the flashing light sequence reset it and it was ok after that never did find out why it locked out?
You might get away with it, often they weep a bit for a couple of days then stop. But you might not, as others have said, and it's no fun replacing them .
Worcester cdi's have many of the same sorts and makes of bits as many other boilers which were a lot cheaper. The brass parts are ALL likely to be Italian - some certainly are.
Worcester cdi's have many of the same sorts and makes of bits as many other boilers which were a lot cheaper. The brass parts are ALL likely to be Italian - some certainly are.
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