Potterton Promax System - No power??

[armyash]

Hi guys,

After a long day I got sent to have a look at a Potterton Promax System boiler.

All lights off. I checked the fuse spur. No power in or out.

switch at the board had tripped.

Turned back on but fuse would keep blowing.

No leaks visible in boiler, no loose connections that I can see.

The pump at the cylinder has had some leakage. Disconnected the pump and tried the power again. Still trips and blows the fuse.

Any ideas??!!

I have probably missed something but was at the end of a long few days and wasn't exactly focused.

Thanks

 

[dave1]

Your on the right track I believe, disconnect components one by one eg timer, fan etc until it doesnt blow the fuse.

 

[Ermintrude]

Was it internal or external fuse? I

 

[armyash]

Was it internal or external fuse? I

It was the fuse at the spur.

 

[Ermintrude]

Big fault then from direct connection pump or fan possibly a fault on supply main switch? At worst pcb transformer dead.

 

[armyash]

Got to go and do a flush and commission on a new install first thing so hopefully get to go back and have another look with a clear head.

 

[Billy Bob Bob]

Got to go and do a flush and commission on a new install first thing so hopefully get to go back and have another look with a clear head.

firstly look at components where water and elec can mix you have treid a pump,3 port would be next port of call disconnect lives and neutrals from it however may want to discon boiler first as its easier,2x fast fuses in wiring strip in drop down cover one on live one on neutral remove both and try the trip

 

[Ermintrude]

Pump poss split seal?

 

[Billy Bob Bob]

Pump poss split seal?

hes already disconed the pump

 

[armyash]

Thanks guys, will update when possible.