Hot water cylinder making squeaking and running water noise.

[Princealbert40]

Hello,

I am in South Devon and have a Daikin monobloc air source heat pump with HW cylinder which provides CH & HW. Currently CH off and just supplying HW. Once a week (SAT) the system heats up to 70c for sterlistion etc. It has been doing this in almost silence for 3 1/2 years until today. Today HW cylinder has been making a squeaking & running water noise which has never been noticed before. Any advice of how to cure this noise would be much appreciated. Many thanks.

 

[oz-plumber]

Check that the pressure relief valve is not passing water.
It could be a faulty valve.

 

[Chuck]

Today HW cylinder has been making a squeaking & running water noise which has never been noticed before.

There will be an expansion vessel somewhere. This may not be doing its job because it needs recharging or replacing. Consult the User Instructions book for any fault finding advice for your system but you'll probably need the installer or another suitably qualified plumber to attend.

 

[OffshoreGas]

Can normally test the expansion vessel by tapping with your nails.

A tinny hollow sound and it’s OK. Dull thus and it’s full of water and needs servicing.