Honeywell V4073A 3 Port Motorised Valve Wiring question

[Reddwarf4ever]

Ok......thanks . . . . . . . . . . .

 

[Murdoch]

Your boiler / wiring should have a single point of isolation, normally a fused spur ..... occasionally I find systems with 2 supplies which isn’t good

you need a way to check the wiring is isolated

 

[Reddwarf4ever]

Ok thanks . . . . . . . . . . . . . . . . .

 

[Reddwarf4ever]

A follow up question, I changed the Honeywell 3 port valve, I turned the house mains off ‘ just in case’ & all went well......the problem with the 3 port valve I replaced, exactly same model, was that it often got ‘ stuck’ when being asked for heating, the hot water side was fine. I found that when this happened, I pushed the lever down fully ( some resistance felt) it then started the boiler / pump etc and worked fine for several hours, but maybe when the room stat was satisfied and then went to demand again the problem happened, not sure. But is this a sign of a faulty motor, / solenoid, can it be fixed, or is it indeed worth trying to fix....just want to know if it should go in the bin or not....will keep the base, as I think it’s the head only at fault.....thanks