biasi m96 24smc pump keeps running

[ezflow]

i need help on a biasi riva compact he m96 24smc,
eventhough there is noo demand to the boiler the pump keeps running which causes the boiler to fire up and over heat, i have checked the microswitch which is fine.

anyone had this problem and can advice me what the problem is please??
my thought is to change the pcb board???

 

[Slugbabydotcom]

even though there is noo demand to the boiler the pump keeps running which causes the boiler to fire up and over heat

If there wasnt a demand it wouldnt fire I reckon its possible that your hw flow switch is stuck on and calling for heat

 

[ezflow]

I think your right mate, let me change that and see
thanks mate