Worcester 9.24 Electronic Blowing fuse

[monkeybear]

Please help!, I have a Worcester 9.24 electronic combi boiler which has started to blow the 3amp fuse intermittently when the hot tap is turned off. The Heating works fine & The fuse never blows if the heating is on when you turn the hot tap off it only happens when you are using hot water only & only when the tap is turned off, there are no water leaks , any ideas

 

[Agile]

That sounds like a very odd fault if that really is what its doing.

I would suggest a careful inspection of all electrical connects in the vicinity of water carrying parts.

Tony

 

[monkeybear]

Thanks Tony for your help, I have checked for signs of water or water marks around the diverter valve, pump, heating & hot water sensors & pump overrun stat, i have been thinking that maybe a sensor could be starting to breakdown electrically & may change the heating & hot water sensors & the pump overrun stat as a starting place, have you or anybody else got any more thoughts as this is starting to melt my head

 

[Agile]

Sensors are low voltage and therefore not relevant.

If it were the pump o/r stat then you would see water.

Might be a fault on a pcb relay.

These boilers are very old now!

 

[monkeybear]

Thanks Tony, Have been quoted 75.35pounds for the main board, will look to change that, this boiler is 15years old & has not cost anything in that time apart from two thermocouples, i don't want to throw too much money, will probably have to start thinking about replacing it, once again thanks for the help.