Reasons why F & E overflows?

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apart from a faulty float valve letting water by, or a hole in the float ball preventing the float arm rising and shutting off the supply, and a pinhole in the hot water cylinder coil, what other reasons are there for a Feed & Expanison tank overflowing?
 
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constantly overflowing?

could be a shower backfilling the cylinder.
 
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my mistake. i skipped over it when i read hot water cylinder. :oops:
 
Agree with powell30. 9/10 times blockage is where cold feed from F&E joins on to return pipework.

Can clear with gently tapping of pipework to dislodge anything there, magnets either side to try and sift a blockage, try tipping down kind of pipe clearing solution down the outlet from the F&E if thats possible. Alternatively can try and cut out the blocked section and replace - but be careful when doing this as the blockage may be preventing the system from draining down correctly and when you cut into the pipework you may get drowned :LOL: Might be best if you are going to go that route to freeze the pipes you want to cut out.
 
have seen overflow from cws terminating over f&e and causing that to overflow to outside. would be fairly obvious though.
 

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