Potterton Performa 24 heating cutting out

[catmkcat]

hello, please could someone help!

our boiler has just started to play up. when you turn on the heating via the timer it blows the fuses in the boiler. is it the timer that needs replacing or what else could it be further up the system? and how would we be able to tell??
hot water works fine. (when the fuse isnt blown!!!)

any help apprichiated!

cheers.

 

[misterdubya]

Use your multimeter.

 

[catmkcat]

what if you dont have one?

 

[MANDATE]

This may help

//www.diynot.com/forums/plumbing/fuse-blowing.295946/#2155596

 

[misterdubya]

what if you dont have one?

Buy one.

If your serious about repairing your own boiler (and remember, I cannot give you advice about gas), then your gonna struggle without one.

What fuses are blowing?

 

[catmkcat]

the first time it did it when the timer kicked in and blew the internal fast blow 2 amp fuse, the 3 amp fuse in the wall switch and tripped the fuse box. but after replacing them and starting it up again it was just the 2 amp internal one that went.

 

[gazthepottertonengineer]

Link out the external controls to rule them out first! Then try it with pump disconnected etc till fuse doesn't blow! Then you will know what is the problem