Phantom Water Pump

[Porcupine]

Hi,

 

My water pump switches on for a couple of seconds when it feels like it. It just comes on, gives a quick BRRRRR and then switches itself back off again. Which is a tad annoying in the middle of the night. Any ideas? 
Thanks very  much, Matt

[Alan de Enfield]

 

1) You have a leak.

2) You have a leak

3) You have hot water in your calorifier and as it cools down the volume reduces and it takes a 'BRRRRR' to top the pressure back it.

[mrsmelly]

Leak.

[Machpoint005]

There's an echo in here!

 

 

[pete.i]

Leak

[Tony Brooks]

No accumulator so there is no way of making up for the loss of pressure as the water cools down and contracts.

 

If it does it during the day then it might be a slight weep  somewhere but "in the middle of the night" is typical of cooling water and no accumulator or a faulty/depressurised accumulator