overflow dripping

[nightowl226]

The overflow pipe from the large cold water tank in the loft is dripping but only when the central heating is on. Any ideas what I need to do please?

 

[bengasman]

Are you sure it doesn't come from the headertank?

 

[nightowl226]

No definately from water tank, the overflow from the small tank runs a completely way.

 

[bengasman]

What is the exact model of your timer?

 

[nightowl226]

The central heating time is a Randall 103 old clockwork type. The central heating and hot water are not seperate, so we have to have both on or nothing on.

 

[bengasman]

I suspected as much. It's probably a matter of adjusting the maximum level in the cold tank so it stops filling an inch or so lower than currently.

 

[cantaloup63]

I suspected as much. It's probably a matter of adjusting the maximum level in the cold tank so it stops filling an inch or so lower than currently.

I'm intrigued as to how the central heating being on affected the water level in the CWS Moreover, what did the make of the timer have to do with it all?

 

[nightowl226]

Thanks will give that a try later and let you know the outcome.

 

[Charnwood]

I'm intrigued as to how the central heating being on affected the water level in the CWS ?

Heating on, water in cylinder gets hot, expands, raises level in the tank feeding it.

I'm also intrigued about the timer question.

 

[cantaloup63]

I'm intrigued as to how the central heating being on affected the water level in the CWS ?

Heating on, water in cylinder gets hot, expands, raises level in the tank feeding it..

TBH, that was my original thought, but I was doubting it since surely the water in the cylinder is hot anyway

 

[Charnwood]

I was doubting it since surely the water in the cylinder is hot anyway

Only if the last lot of heated water has not been used up.