Alpha C27 boiler pressure keeps dropping over night

[seedsy4]

Hi,
My alpha c27 boiler pressure keeps dropping most nights over night while its been really cold, any ideas? The only thing is that sometimes there is a little collection of water underneath the boiler (not much water and not all the time)

Cheers
Matt[/url]

 

[dcawkwell]

Expansion vessel.
After you have topped the boiler up to 1 bar and put the heating on. Does the pressure get up to 3 bar? If so expansion vessel.

 

[seedsy4]

Expansion vessel.
After you have topped the boiler up to 1 bar and put the heating on. Does the pressure get up to 3 bar? If so expansion vessel.

Yes the pressure does rise up and near/into the red, is it an easy job to fix or will I need to get a plumber in? And if so roughly how much do you reckon it will cost? Thanks

 

[dcawkwell]

Expansion vessel.
After you have topped the boiler up to 1 bar and put the heating on. Does the pressure get up to 3 bar? If so expansion vessel.

Yes the pressure does rise up and near/into the red, is it an easy job to fix or will I need to get a plumber in? And if so roughly how much do you reckon it will cost? Thanks

Use a car foot pump on the expansion vessl when the boiler is low on pressure in the morning. Pump it up to about 1 bar should be ok.