Hot water problems

[Novice Bob]

I recently removed all my radiators, manually flushed them through and refitted them.
I refilled, bled and balanced the system.

All rads now get good and hot and the boiler sounds fine.

However, when I select hot water, the pipes by the h/water cylinder make a squelching/squirting sound and the boiler sounds like a boiling kettle and seems to go off after a few minutes. When I deselect h/water, the motorised valve amkes a bit of a rattle when it turns off. None of this happened before.

Any ideas as to what's wrong?

 

[oz-plumber]

Yes,

You have no flow through the boiler when you select hot water.

I wouldn't keep switching the boiler to hot water and let the boiler kettle like that to many times.
Unless of course you want expensive repairs or a boiler replacement.

Post and add on here and get someone in.

 

[Novice Bob]

Many thanks for your reply oz-plumber, I will definitely heed your advice.

Out of curiosity, what could have caused the non-flow (on hot water) situation?

 

[oz-plumber]

Probably the motorised valve.
It may be air, but I would have that the pump would push that through the coil relatively quickly.

 

[Centralheatking]

Some motor valves have a mannual over-ride so you could check its performance this way in my opinion CHKing

Probably the motorised valve.
It may be air, but I would have that the pump would push that through the coil relatively quickly.

 

[jam1979]

Your hot water heat exchanger could be on its way out I'd also check the auto air vent in the boiler to make sure it's open

 

[Neil K]

You say you have a Hw cylinder, is there any sort of a vent on it? On the cylinder primary circuit, the same pipework where the motorised valve is on?

 

[Ermintrude]

Bleed coil on dhw cylinder u have a hair lock