Ideal combi heating running constantly

[mutley racers]

I honestly thought I was getting the hang of understanding switches and electrics. I really need a good book to help me get it once and for all

 

[mutley racers]

I believ that A and B are volt free switch contacts

 

[mountainman]

I believ that A and B are volt free switch contacts

Correct.

 

[IDCHAPPY]

I honestly thought I was getting the hang of understanding switches and electrics. I really need a good book to help me get it once and for all

Same here, I'm shyte with electrics :lol:.
Need to do some courses as my old boy isn't going to be around forever.

 

[Ermintrude]

The diagram shows an internal switch between a and. C. So when stat is in it's normal postion it's

 

[mutley racers]

The diagram shows an internal switch between a and. C. So when stat is in it's normal postion it's

Not calling

 

[Ermintrude]

Yep then when calling it swings to a b . The Live and neutral terminals are completely independent as no links shown. If you wanted a switched like u put a link from l to a then when it's calling live ends up at c

 

[mutley racers]

Yep then when calling it swings to a b . The Live and neutral terminals are completely independent as no links shown. If you wanted a switched like u put a link from l to a then when it's calling live ends up at c

And this is how I found the stat wired when I arrived. In the picture I drew. The top one. So do you believe that this has caused the pcb to be knackered?

So, I am getting to grips with electrics.

Thanks for tests ermi

 

[Ermintrude]

Yep probs killed pcb! Are were fast blow fuses blown? They are usually clear glass ones inside pcb case? There are two spare ones inside on black rubber tee minimal guard?

 

[mutley racers]

I didn't look at clear fuses. I just checked thermister and diverter valve. I assumed it was the pcb until I called technical and she said the stat wasn't volt free. So had me 2nd guessing myself

 

[mutley racers]

All fixed this. New pcb solved it. Thanks for all the help